802.1Q VLAN
User’s Guide
9032599-02
NOTICE
Cabletron Systems reserves the right to make changes in specifications and other information
contained in this document without prior notice. The reader should in all cases consult Cabletron
Systems to determine whether any such changes have been made.
The hardware, firmware, or software described in this manual is subject to change without notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,
INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.
1999 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9032599-02 February 1999
Cabletron Systems and SECUREFAST are registered trademarks and SMARTSWITCH is a trademark
of Cabletron Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.
802.1Q VLAN User’s Guide
i
Notice
ii
802.1Q VLAN User’s Guide
Figures ....................................................................................................vii
Tables..................................................................................................... viii
PREFACE
CHAPTER 1
1.2 Types of VLANs........................................................................... 1-3
1.5 Getting Help................................................................................. 1-7
CHAPTER 2
2.1 Description................................................................................... 2-1
2.3.1 Defining a VLAN ............................................................. 2-2
2.4 VLAN Switch Operation............................................................... 2-3
2.4.1 Receiving Frames from VLAN Ports............................... 2-4
2.4.2 Forwarding Decisions ..................................................... 2-5
2.4.2.1 Broadcasts, Multicasts, and Unknown
Unicasts.......................................................... 2-5
2.4.2.2 Known Unicasts.............................................. 2-5
2.5 GARP Switch Operation.............................................................. 2-6
802.1Q VLAN User’s Guide
iii
Contents
CHAPTER 3
3.7.1 Viewing Current VLAN Ports.........................................3-22
3.8.1 Displaying the Current Protocol, VLAN ID, and
Port Assignments ..........................................................3-28
3.8.2 Assigning a Protocol Family to a VLAN ID....................3-28
3.8.3 Displaying the Protocol Types on Current Ports ...........3-30
3.9 Protocol Ports Configuration Screen..........................................3-31
3.9.1 Adding/Deleting Ports Associated with a VLAN ID........3-33
3.10 Quick VLAN Walkthrough ..........................................................3-33
iv
802.1Q VLAN User’s Guide
CHAPTER 4
4.2.1 Solving the Problem........................................................ 4-5
4.2.2 Frame Handling .............................................................. 4-8
4.3 Example 3, 1D Trunk Connection to 802.1Q VLAN Network .... 4-10
4.3.1 Solving the Problem...................................................... 4-12
4.3.2 Frame Handling ............................................................ 4-13
4.4 Example 4, Isolating Network Traffic According to Protocol...... 4-17
4.4.1 Solving the Problem...................................................... 4-18
802.1Q VLAN User’s Guide
v
Contents
vi
802.1Q VLAN User’s Guide
Figure
1-1
2-1
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
Transmitting to Switch 4........................................................... 4-9
Transmitting to Bridge 4 ......................................................... 4-10
Example 3, 1D Trunk Connection to 802.1Q VLAN Network. 4-11
Bridge 1 Broadcasts Frames.................................................. 4-14
Switch 2 Forwards to 1Q Trunk.............................................. 4-15
Switch 1 Forwards to 1D Trunk.............................................. 4-15
Example 4, Isolating Traffic According to Protocol................. 4-18
4-10
4-11
802.1Q VLAN User’s Guide
vii
Table
3-1
3-2
3-3
3-4
3-5
3-6
3-7
802.1Q VLAN Configuration Menu Screen Menu Items .......... 3-7
Device VLAN Configuration Screen Field Definitions ............. 3-9
Port Assignment Configuration Screen Field Definitions........ 3-15
Port Filtering Configuration Screen Field Definitions ............. 3-19
VLAN Forwarding Configuration Screen Field Definitions ..... 3-22
Protocol VLAN Configuration Screen Field Definitions ......... 3-26
Protocol Ports Configuration Screen Field Definitions .......... 3-32
802.1Q VLAN User’s Guide
viii
PREFACE
Welcome to the Cabletron Systems 802.1Q VLAN User’s Guide. This
guide introduces and describes Cabletron Systems’ implementation of the
IEEE 802.1Q standard for 802.1Q Virtual Local Area Network (VLAN)
technology, and the VLAN Local Management screens used to configure
Cabletron Systems products used in 802.1Q VLAN environments.
USING THIS GUIDE
This guide serves as a supplement to the Local Management chapter of
the Cabletron Systems user’s guides for devices that support 802.1Q
VLANs. Read Chapter 1 and Chapter 2 first to gain an understanding of
VLANs, the associated terminology, and the process for configuring
VLANs on a switch. Look at the examples in Chapter 4 to see how
VLANs can be created and changed using the existing network
infrastructure in a building and how the switch handles the frames while
they make their way through the networks shown in the examples.
quick walkthrough on how to use them to configure VLANs in a switch.
STRUCTURE OF THIS GUIDE
This guide is organized as follows:
Chapter 1, Virtual Local Area Networks, presents the basic concepts of
information about how to obtain additional help if needed.
Chapter 2, VLAN Operation, describes the operation of an 802.1Q
VLAN, the steps necessary to prepare an 802.1Q VLAN aware switch for
VLAN operation, and examines the operation of an 802.1Q VLAN
switch.
Chapter 3, VLAN Configuration, describes how to set up the switch for
local and remote management, shows the Local Management screens
used in 802.1Q VLAN configuration and explains their use.
Chapter 4, Examples, offers examples of 802.1Q VLANs and explains
how network transmissions are treated by the components of each VLAN.
802.1Q VLAN User’s Guide
ix
Preface
RELATED DOCUMENTS
Other Cabletron Systems documents that may be useful for understanding
some of the concepts introduced or discussed in this guide are listed
below:
The SmartSwitch user’s guide of any Cabletron Systems 802.1Q VLAN
aware SmartSwitch device.
The manual can be obtained from the World Wide Web in Adobe Acrobat
Portable Document Format (PDF) at the following site:
DOCUMENT CONVENTIONS
The following conventions are used throughout this document:
Note symbol. Calls the reader’s attention to any item of
information that may be of special importance.
NOTE
In Local Management sections, Bold type indicates fields, field values,
and commands that can be highlighted or selected by the user.
In Local Management sections, keystrokes are shown in UPPERCASE.
Italic type denotes complete book titles.
x
802.1Q VLAN User’s Guide
CHAPTER 1
VIRTUAL LOCAL AREA NETWORKS
This chapter introduces the concepts of Virtual Local Area Networks
(VLANs) and discusses the central concepts of IEEE 802.1Q VLANs.
This chapter also contains information on how to contact Cabletron
Systems for additional support related to VLANs.
1.1
DEFINING VLANs
A Virtual Local Area Network is a group of devices that function as a
single Local Area Network segment (broadcast domain). The devices that
make up a particular VLAN may be widely separated, both by geography
and location in the network.
The creation of VLANs allows users located in separate areas or
connected to separate ports to belong to a single VLAN group. Users that
are assigned to such a group will send and receive broadcast and multicast
traffic as though they were all connected to a common network. VLAN
aware switches isolate broadcast, multicast, and unknown traffic received
from VLAN groups, so that traffic from stations in a VLAN are confined
to that VLAN.
connection is not changed. Stations connected to switched ports do not
sacrifice the performance of the dedicated switched link to participate in
the VLAN. As a VLAN is not a physical location, but a membership, the
network switches determine VLAN membership by associating a VLAN
with a particular port or frame type.
Figure 1-1 shows a simple example of a port based VLAN. Two buildings
house the Sales and Finance departments of a single company, and each
building has its own internal network. The stations in each building
connect to a SmartSwitch in the basement. The two SmartSwitches are
connected to one another with a high speed link.
802.1Q VLAN User’s Guide
1-1
Chapter 1: Virtual Local Area Networks
Building One
Building Two
S
S
S
S
S
S
F
F
F
F
10
9
8
7
trunk
1
6
A
B
SmartSwitch
SmartSwitch
F
S
Member of Sales Network
Member of Finance Network
2263-01
Figure 1-1 Example of a VLAN
In this example, the Sales and Finance workstations have been placed on
two separate VLANs. In a plain Ethernet environment, the entire network
is a broadcast domain, and the SmartSwitches follow the IEEE 802.1D
bridging specification to send data between stations. A broadcast or
multicast transmission from a Sales workstation in Building One would
propagate to all the switch ports on SmartSwitch A, cross the high speed
link to SmartSwitch B, and then propagated out all switch ports on
SmartSwitch B. The SmartSwitches treat each port as being equivalent to
any other port, and have no understanding of the departmental
memberships of each workstation.
In a VLAN environment, each SmartSwitch understands that certain
individual ports or frames are members of separate workgroups. In this
environment, a broadcast or multicast data transmission from one of the
Sales stations in Building One would reach SmartSwitch A, be sent to the
ports connected to other local members of the Sales VLAN, cross the high
speed link to SmartSwitch B, and then be sent to any other ports and
workstations on SmartSwitch B that are members of the Sales VLAN.
1-2
802.1Q VLAN User’s Guide
Types of VLANs
1.2
TYPES OF VLANs
There are a number of different strategies for creating Virtual Local Area
Networks, each with their own approaches to defining a station’s
membership in a particular VLAN.
1.2.1
802.1Q VLANs
An 802.1Q VLAN switch determines the VLAN membership of a data
frame by its Tag Header, described later in this chapter. If the frame
received is not tagged, the switch classifies the frame into the VLAN that
is assigned as the default VLAN of the switch.
Some or all ports on the switch may be configured to operate as GARP
VLAN Registration Protocol (GVRP) ports. If a frame received is tagged,
the frame is forwarded to the GVRP ports that are configured to transmit
frames associated with the frame VLAN ID and protocol. If the received
frame is not tagged, the frame is examined and tagged as belonging to the
default VLAN. Then the frame is forwarded to the GVRP ports that are
configured to transmit frames associated with the default VLAN and the
frame protocol.
1.2.2
SecureFast VLANs
Cabletron Systems’ SecureFast VLAN strategy takes a different approach
to creating virtual LANs. In a SecureFast VLAN environment, the
switches in the network recognize Network Layer routing requests and
translate them. Based on this translation, the switches set up a connection
between the end devices in the network.
1.2.3
Other VLAN Strategies
VLANs may also be created by a variety of addressing schemes,
including the recognition of groups of MAC addresses or types of traffic.
One of the best-known VLAN-like schemes is the use of IP Subnets to
divide networks into smaller subnetworks.
802.1Q VLAN User’s Guide
1-3
Chapter 1: Virtual Local Area Networks
1.3
BENEFITS AND RESTRICTIONS
The primary benefit of the 802.1Q VLAN technology is that it provides
localization of traffic. This function also offers improvements in security
and performance to stations assigned to a VLAN.
While the localization of traffic to VLANs can improve security and
performance, it imposes some restrictions on network devices that
participate in the VLAN. Through the use of Filtering Database ID’s
(FIDs) security can be implemented to enable or prevent users from one
or more VLANs from communicating with each other.
One or more VLANs can be assigned to a FID so that all the users that
share a common FID can communicate with each other regardless of their
VLAN affiliation. However, for the sake of security, the members of one
FID cannot communicate with the members of another FID.
To set up a VLAN, all the network switch devices that are assigned to the
VLAN must support the IEEE 802.1Q specification for VLANs. Before
you attempt to implement a VLAN strategy, ensure that the switches
under consideration support the IEEE 802.1Q specification.
1.4
VLAN TERMS
To fully understand the operation and configuration of port based VLANs,
it is essential to understand the definitions of several key terms.
VLAN ID
A unique number (between 1 and 4094) that identifies a particular VLAN.
VLAN Name
A 32-character alphanumeric name associated with a VLAN ID. The
VLAN Name is intended to make user-defined VLANs easier to identify
and remember.
Filtering Database Identifier (FID)
Addressing information that the device learns about a VLAN is stored in
the filtering database assigned to that VLAN. Several VLANs can be
assigned to the same FID to allow those VLANs to share addressing
information. This enables the devices in the different VLANs to
communicate with each other when the individual ports have been
configured to allow communication to occur.
1-4
802.1Q VLAN User’s Guide
VLAN Terms
The configuration is accomplished using the Local Management VLAN
Forwarding Configuration screen. By default a VLAN is assigned to the
FID that matches its VLAN ID.
Tag Header (VLAN Tag)
Four bytes of data inserted in a frame that identifies the VLAN/frame
classification. The Tag Header is inserted into the frame directly after the
Source MAC address field. Twelve bits of the Tag Header represent the
VLAN ID. The remaining bits are other control information.
Tagged Frame
A data frame that contains a Tag Header. A VLAN aware device can add
the Tag Header to any frame it transmits.
Untagged Frame
A data frame that does not have a Tag Header.
Default VLAN
The VLAN to which all ports are assigned upon initialization. The
Default VLAN has a VLAN ID of 1 and cannot be deleted or renamed.
Forwarding List
A list of the ports on a particular device that are eligible to transmit
frames for a selected VLAN.
Port VLAN List
A per port list of all eligible VLANs whose frames can be forwarded out
one specific port and the frame format (tagged or untagged) of
transmissions for that port. The Port VLAN List specifies what VLANs
are associated with a single port for frame transmission purposes.
Filtering Database
A database structure within the switch that keeps track of the associations
between MAC addresses, VLANs, and interface (port) numbers. The
Filtering Database is referred to when a switch makes a forwarding
decision on a frame.
1Q Trunk
A connection between 802.1Q switches that passes only traffic with a
VLAN Tag Header inserted in the frame. By default, a port designated as
a 1Q Trunk port has all VLANs in its Port VLAN List and is configured to
transmit all frames as tagged frames. A 1Q Trunk drops all incoming
frames that do not have a VLAN tag.
802.1Q VLAN User’s Guide
1-5
Chapter 1: Virtual Local Area Networks
1D Trunk
A connection from a switch that passes only untagged traffic. By default,
a port designated as a 1D Trunk port has all VLANs on its Port VLAN
List and is configured to transmit all frames as untagged frames.
Generic Attribute Registration Protocol (GARP)
GARP is a protocol used to propagate state information throughout a
switched network.
GARP VLAN Registration Protocol (GVRP)
A GARP application used to dynamically create VLANs across a
switched network.
GARP Multicast Registration Protocol (GMRP)
A GARP application that functions in a similar fashion as GVRP, except
that GMRP registers multicast addresses on ports to control the flooding
of multicast frames.
1-6
802.1Q VLAN User’s Guide
Getting Help
1.5
GETTING HELP
For additional support related to this device or document, contact
Cabletron Systems using one of the following methods:
World Wide Web
Phone
(603) 332-9400
Internet mail
FTP
anonymous
Login
Password
your email address
To send comments or suggestions concerning this document, contact the
Cabletron Systems Technical Writing Department via the following
Make sure to include the document Part Number in the email message.
Before calling Cabletron Systems, have the following information
ready:
•
•
•
Your Cabletron Systems service contract number
A description of the failure
A description of any action(s) already taken to resolve the problem
(e.g., changing mode switches, rebooting the unit, etc.)
•
The serial and revision numbers of all involved Cabletron Systems
products in the network
•
•
•
A description of your network environment (layout, cable type, etc.)
Network load and frame size at the time of trouble (if known)
The device history (i.e., have you returned the device before, is this a
recurring problem, etc.)
•
Any previous Return Material Authorization (RMA) numbers
802.1Q VLAN User’s Guide
1-7
Chapter 1: Virtual Local Area Networks
1-8
802.1Q VLAN User’s Guide
CHAPTER 2
VLAN OPERATION
This chapter describes the operation of a VLAN switch and discusses the
operations that a VLAN switch performs in response to both normal and
VLAN-originated network traffic.
2.1
DESCRIPTION
The 802.1Q VLAN operation is slightly different than the operation of
traditional switched networking systems. These differences are due to the
importance of keeping track of each frame and its VLAN association as it
passes from switch to switch or from port to port within a switch.
2.2
VLAN COMPONENTS
Before describing the operation of an 802.1Q VLAN, it is important to
understand the basic elements that are combined to make up an 802.1Q
VLAN.
Stations
A station is any end unit that belongs to a network. In the vast majority of
cases, stations are the computers through which the users access the
network.
Switches
In order to configure a group of stations into a VLAN, the stations must
be connected to VLAN aware switches. It is the job of the switch to
classify received frames into VLAN memberships and transmit frames,
according to VLAN membership, with or without a VLAN Tag Header.
802.1Q VLAN User’s Guide
2-1
Chapter 2: VLAN Operation
2.3
CONFIGURATION PROCESS
aware SmartSwitches default to operate in the 802.1Q VLAN mode.
However, further configuration is necessary to establish multiple logical
networks.
The actual steps involved in VLAN configuration using Local
Management are presented in Chapter 3, VLAN
NOTE
Configuration.This brief section describes the actions that
must be taken in very general terms, and is intended only to aid
in the Administrator’s understanding of VLAN switch operation.
2.3.1
Defining a VLAN
A VLAN must exist and have a unique identity before any ports or rules
can be assigned to it. The Administrator defines a VLAN by assigning it a
unique identification number (the VLAN ID), a filter database
association, and an optional name. The VLAN ID is the number that will
identify data frames originating from, and intended for, the ports that will
belong to this new VLAN.
2.3.2
Classifying Frames to a VLAN
Now that a VLAN has been created, rules are defined to classify all
frames in a VLAN. This is accomplished through management by
associating a VLAN ID with each port on the switch. Optionally, frames
can be classified according to a protocol identifier contained within the
frame. The order of frame classification priority is by VLAN Tag, a
protocol match, and lastly the PVID. This combination of the switch
port’s identification and the VLAN ID becomes the Port VLAN ID
(PVID).
At the same time, the Administrator configures the trunk ports that need to
consider themselves members of every VLAN. The configuration of trunk
ports is very important in multiswitch VLAN configurations where a
frame’s VLAN membership needs to be maintained across several
switches.
2-2
802.1Q VLAN User’s Guide
VLAN Switch Operation
2.3.3
Customizing the VLAN Forwarding List
Each port on a VLAN aware switch has a VLAN forwarding list that
contains, as a minimum, the PVID of the VLAN configured. Additionally,
the Port VLAN Forwarding List of each port can be configured to allow
any number of VLANs to be added to its list. In the case of GMRP
(dynamic VLANs), the list can have VLANs added and deleted by the
switch as directed by the protocol.
2.4
VLAN SWITCH OPERATION
IEEE 802.1Q VLAN switches act on the classification of frames into
VLANs. Sometimes, VLAN classification is based on tags in the headers
of data frames. These VLAN tags are added to data frames by the switch
as the frames are transmitted out certain ports, and are later used to make
forwarding decisions by the switch and other VLAN aware switches. In
the absence of a VLAN tag header, the classification of a frame into a
particular VLAN depends upon the configuration of the switch port that
received the frame.
The operation of an 802.1Q VLAN switch is best understood from a point
of view of the switch itself. To illustrate this concept, the examples that
follow view the switch operations from inside the switch.
802.1Q VLAN User’s Guide
2-3
Chapter 2: VLAN Operation
Figure 2-1 depicts the inside of a switch with six ports, numbered one
through six. The switch has been configured to associate VLAN A and B
with FID 2, VLAN C and D with FID 3, and VLAN E with FID 4. Port 6
has been classified as a 1Q Trunk Port. This classification establishes that
all VLANs are members of the Port VLAN List for Port 6 and the frames
transmitted for all VLANs will contain a tag header. Also the PVID for
Port 6 is set to the default VLAN with its corresponding relationship to
FID 1. Although untagged frames are not usually present on a 1Q Trunk
Port, any untagged frames received would need to be classified if the port
has not been configured to drop all untagged frames.
Port 1
Port 4
Port 2
Port 5
Port 3
Port 6
A
B
C
FID 2
FID 2
FID 3
Default
FID 1
D
FID 3
E
FID 4
2599-02
Figure 2-1 Inside the Switch
2.4.1
Receiving Frames from VLAN Ports
When a switch is placed in 802.1Q Operational Mode, every frame
received by the switch must belong, or be assigned, to a VLAN.
Untagged Frames
The switch receives a frame from Port 1 and examines the frame. The
switch notices that this frame does not currently have a VLAN tag. The
switch recognizes that Port 1 is a member of VLAN A and classifies the
frame as such. In this fashion, all untagged frames entering a VLAN
switch assume membership in a VLAN.
A VLAN ID is always assigned to a port. By default, it is the
Default VLAN (VLAN ID = 1).
NOTE
2-4
802.1Q VLAN User’s Guide
VLAN Switch Operation
The switch will now make a forwarding decision on the frame, as
described in Section 2.4.2, Forwarding Decisions.
Tagged Frames
In this example, the switch receives a tagged frame from Port 4. The
This frame may have already been through a VLAN aware switch, or
originated from a station capable of specifying a VLAN membership. If a
switch receives a frame containing a tag, the switch will classify the frame
in regard to its tag rather than the PVID for its port.
The switch will now make a forwarding decision on the frame, as
described in Section 2.4.2, Forwarding Decisions.
2.4.2
Forwarding Decisions
The type of frame under consideration and the filter setting of a VLAN
switch determines how it forwards VLAN frames.
Unicasts
If a frame with a broadcast, multicast, or other unknown address is
received by an 802.1Q VLAN aware switch, the switch checks the VLAN
classification of the frame. The switch then forwards the frame out all
ports that are identified in the Forwarding List for that VLAN. For
example, if Port 3, shown in Figure 2-1, received the frame, the frame
would then be sent to all ports that had VLAN C in their Port VLAN List.
2.4.2.2 Known Unicasts
When a VLAN switch receives a frame with a known MAC address as its
destination address, the action taken by the switch to determine how the
frame is transmitted depends on the VLAN, the VLAN associated FID,
and if the port identified to send the frame is enabled to do so.
When a frame is received it is classified into a VLAN. The destination
address is looked up in the FID associated with the VLAN. If a match is
found, it is forwarded out the port identified in the lookup if, and only if,
that port is allowed to transmit frames for that VLAN. If a match is not
found, then the frame is flooded out all ports that are allowed to transmit
frames belonging to that VLAN.
802.1Q VLAN User’s Guide
2-5
Chapter 2: VLAN Operation
For example, assume that a frame is received by the switch depicted in
Figure 2-1. This frame is a unicast untagged frame received on Port 3.
The frame is then classified for VLAN C. The switch then makes its
forwarding decision by comparing the destination MAC address to its
filtering database. In this case, the MAC address is looked up in the
filtering database FID 3, which is associated with VLAN C and VLAN D.
The switch recognizes the destination MAC address of the frame as being
located out Port 4.
Having made the forwarding decision, the switch now examines the Port
VLAN List of Port 4 to determine if it may transmit a frame belonging to
VLAN C. If so, the frame is transmitted out Port 4. If Port 4 has not been
configured to transmit frames belonging to VLAN C, the frame is
discarded.
2.5
GARP SWITCH OPERATION
Some or all ports on the switch may be activated to operate under the
Generic Attribute Registration Protocol (GARP) applications, GVRP
and/or GMRP. For a description of the protocols and how the frames are
handled, refer to the user’s guide of your SmartSwitch device.
2-6
802.1Q VLAN User’s Guide
CHAPTER 3
VLAN CONFIGURATION
This chapter describes how to set up the switch for local or remote
management, and the VLAN Local Management screens used to create
and configure VLANs in a SmartSwitch.
3.1
MANAGING THE SWITCH
The switch may be managed locally via a terminal connected to the COM
port, or remotely (SNMP or Telnet sessions) from a management station
connected to a switch port that is a member of the same VLAN as the
switch’s Host Data Port. (By default, this is the default VLAN.) When the
switch is configured with VLANs, special precautions must be taken to
use remote management.
3.1.1
Switch Without VLANs
When the switch is powered up, the switch uses its default settings to
switch frames like an 802.1D switch. In this default configuration, all
ports are a member of the default VLAN (VLAN 1) including the virtual
Host Data Port of the switch, so any port can be used to manage the
device as shown in Figure 3-1.
802.1Q Switch
1
2
3
4
5
6
Host
Data
Port
NOTE: All ports, including the virtual Host Data Port, are
members of the default VLAN. Therefore, any station
shown may be used as the management station.
2599_14
Figure 3-1 Switch Management with Only Default VLAN
802.1Q VLAN User’s Guide
3-1
Chapter 3: VLAN Configuration
3.1.2
Switch with VLANs
If the switch is to be configured for multiple VLANs, it may be desirable
to configure a management-only VLAN. This allows a management
station connected to the management VLAN to manage all ports on the
switch and make management secure by preventing management via
ports assigned to other VLANs.
The switch’s virtual Host Data Port, like any other port, has
configurable VLAN membership. For manageability of the
NOTE
device to be maintained, this port must be a member of the
same VLAN as the port to which the management station is
connected.
Figure 3-2 shows an example of a switch configured with port 1 on the
Management VLAN port and the other users belonging to VLANs A, B,
and C.
802.1Q Switch
Management
VLAN
VLAN B
VLAN B
1
2
3
4
5
6
Host
Data
Port
VLAN A
VLAN A
7
Set as an 802.1Q Trunk port.
25992_15
Figure 3-2 Switch Management with VLANs
To set up the switch shown in Figure 3-2 to establish a management
VLAN on port 1, use the process described below:
1. Use the Device VLAN Configuration screen for the following:
a. Define a new VLAN named “Management VLAN” (or other
suitable name) and itsVLAN ID. In this example, theVLAN ID is
set to 2.
3-2
802.1Q VLAN User’s Guide
Managing the Switch
b. Set the FID so the Management VLAN has its own number to
make the VLAN secure. In this example, the FID is 3 and no other
VLAN should be assigned to this FID. This keeps the new VLAN
from sharing its filtering database with other VLANs in the
switch. For details on defining a VLAN, refer to Section 3.4.1.
2. Use the Port Assignment Configuration screen for the following:
a. Assign the VLAN ID, 2, of the new Management VLAN to a port.
In this example, it is port 1. Leave the Port Mode setting in the
default value of HYBRID.
It is not necessary to configure a physical port for management
on each switch. Only those switches that will have a
NOTE
management station attached to it need a physical port
assigned to the Management VLAN.
Host Data Port. The port number will depend on the device. This
port is not a physical port and will usually be one number above
the maximum number physical ports on the device, including the
ports on any optional interfaces installed. In this example, it will
be port 8. Leave the Port Mode setting in the default value of
HYBRID. For details on assigning a VLAN ID, refer to
Section 3.4.2.
This process would be repeated on every switch that is connected in the
network to ensure that each switch has a secure Management VLAN for
switch management.
If the switch was connected to another switch via port 7, which was set as
a 1Q Trunk port, then the management station connected to the
Management VLAN port of either switch could manage both switches.
The management stations at each switch must be on the same
Management VLAN.
NOTE
No matter how many switches are connected, a management station
connected to any port on the same Management VLAN can be used to
remotely manage any Cabletron Systems 802.1Q switch in the network as
long as the Host Data Port of all the switches are members of the same
Management VLAN.
802.1Q VLAN User’s Guide
3-3
Chapter 3: VLAN Configuration
3.2
SUMMARY OF VLAN LOCAL MANAGEMENT
The VLAN configuration process is an extension of normal Local
Management operations. A series of Local Management screens provides
VLANs and to assign ports to those VLANs.
A switch supporting 802.1Q VLANs provides the VLAN Configuration
screens as a standard part of its Local Management hierarchy when the
switch is configured to operate in 802.1Q Mode. The hierarchy of the
Local Management screens pertaining to 802.1Q VLAN configuration is
shown in Figure 3-3.
Device VLAN Configuration
802.1Q VLAN
Configuration Menu
Port Assignment Configuration
Port Filtering Configuration
VLAN Forwarding Configuration
Protocol VLAN Configuration
Protocol Ports Configuration
25994_03
Figure 3-3 802.1Q VLAN Screen Hierarchy
3.2.1
Preparing for VLAN Configuration
A little forethought and planning is essential to a good VLAN
implementation. Before attempting to configure a single switch for VLAN
operation, consider the following:
•
•
•
•
How many VLANs will be required
What stations will belong to them
What ports are connected to those stations
What ports will be configured as GARP-aware ports
It may also be helpful to sketch out a diagram of your VLAN strategy.
The examples provided in Chapter 4 may be useful for a depiction of the
planning process.
Access Local Management as described in your device user’s guide.
Perform all required initial setup operations. Navigate to the 802.1Q
VLAN Configuration Menu screen to begin the VLAN configuration
process for the device.
3-4
802.1Q VLAN User’s Guide
802.1Q VLAN Configuration Menu Screen
3.3
802.1Q VLAN CONFIGURATION MENU SCREEN
When to Use
To select screens to assign switched network ports to VLANs, define new
VLANs, and configure port filtering according to a VLAN list or
untagged frames. Network users can be logically grouped into VLANs
even if they span long physical distances over a vast, intricate physical
network. The VLAN Local Management menu items listed on the 802.1Q
VLAN Configuration Menu allow such VLANs to be configured on a
network at the switched port of the device or SmartSwitch chassis. Also,
some or all of the ports on the switch can be configured as GVRP ports,
which enable frames received with a particular VLAN ID and protocol to
be transmitted on a limited number of ports. This keeps the traffic
associated with a particular VLAN and protocol to be isolated from the
other parts of the network.
Before attempting the VLAN configuration, ensure that the device to be
configured has been set for 802.1Q SWITCHING mode. The mode
selection is a Local Management operation that is accessible through the
General Configuration screen of the device.
The device resets when changing operational modes.
!
CAUTION
802.1Q VLAN User’s Guide
3-5
Chapter 3: VLAN Configuration
How to Access
Use the arrow keys to highlight the 802.1Q VLAN CONFIGURATION
MENU item from the module, device, or chassis specific Configuration
Menu screen and press ENTER. The 802.1Q VLAN Configuration Menu
screen displays.
Screen Example
6C105 LOCAL MANAGEMENT
802.1Q VLAN Configuration Menu
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
DEVICE VLAN CONFIGURATION
PORT ASSIGNMENT CONFIGURATION
PORT FILTERING CONFIGURATION
VLAN FORWARDING CONFIGURATION
PROTOCOL VLAN CONFIGURATION
RETURN
EXIT
25994-04
Figure 3-4 802.1Q VLAN Configuration Menu Screen
3-6
802.1Q VLAN User’s Guide
802.1Q VLAN Configuration Menu Screen
Menu Definitions
Menu Item
DEVICE VLAN
Screen Function
Used to view, add, name, enable, or disable VLANs
Filter Database ID (FID). It also enables the user to
configure attributes that apply to the entire switch and/or
VLANs. Refer to Section 3.4 for additional information.
PORT
ASSIGNMENT
Displays a list of ports and enables the user to assign a
CONFIGURATION the user to change the operational mode of a port. Refer
to Section 3.5 for additional information.
PORT FILTERING
Used to set the switch to filter out inbound frames to
CONFIGURATION prevent them from being forwarded by the switch out a
particular port. This screen also lists the VLANs whose
frames are eligible to be transmitted out that port. Refer
to Section 3.6 for additional information.
VLAN
FORWARDING
Used to view which ports are included in the VLAN’s
CONFIGURATION frame being transmitted. Refer to Section 3.7 for
additional information.
PROTOCOL
VLAN
Used to assign VLAN IDs to protocol types of received
frames and to access the Protocol Port Configuration
CONFIGURATION screen to add or delete transmitting ports associated with
a specific VLAN ID and protocol type. Refer to
Section 3.6 for additional information.
802.1Q VLAN User’s Guide
3-7
Chapter 3: VLAN Configuration
3.4
DEVICE VLAN CONFIGURATION SCREEN
When to Use
To define the operating characteristics of the switch to add, name, delete,
enable, and disable VLANs, and assign VLANs to FIDs. The screen can
display up to eight VLANs simultaneously.
How to Access
Use the arrow keys to highlight the DEVICE VLAN
CONFIGURATION menu item on the 802.1Q VLAN Configuration
Menu screen and press ENTER. The Device VLAN Configuration screen
displays.
Screen Example
6C105 LOCAL MANAGEMENT
Device VLAN Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
Forward Default VLAN Out All Ports: [NO]
VLAN ID
1
FID
1
VLAN Name
Admin Status
DEFAULT VLAN
[Enabled]
VLAN ID: 1
FID: 1
VLAN Name: DEFAULT VLAN
[ADD]
RETURN
SAVE
EXIT
25993-05
Figure 3-5 Device VLAN Configuration Screen
3-8
802.1Q VLAN User’s Guide
Device VLAN Configuration Screen
Field Definitions
Table 3-2 Device VLAN Configuration Screen Field Definitions
Use this field …
To …
Forward Default
VLAN Out All
Ports
Assign or remove the default VLAN from the Port VLAN
List for all ports. When set to YES, the default VLAN is
added to the Port VLAN List of all ports that do not already
include it. When set to NO, the default VLAN is removed
from the Port VLAN List of any port that does not have the
default VLAN as its PVID. The default is NO.
(Toggle)
VLAN ID - upper
part of screen
(Read-Only)
Display the assigned VLAN IDs that are configured in the
module. Initially, only the Default VLAN (VLAN ID: 1) is
listed.
FID - upper part
of screen
(Read-Only)
Display the names assigned to the corresponding VLAN
IDs. If a name has not been assigned to a VLAN, the
VLAN Name field displays, “Not Defined”.
Admin Status
(Toggle)
Set the current state of the associated VLAN. This field
toggles between Enabled and Disabled. An enabled VLAN
is operational and a disabled VLAN is not operational. If a
VLAN is disabled, all ports assigned to that VLAN will
assume a PVID of the default VLAN.
VLAN ID - lower
part of screen
(Modifiable)
Enter input to select or define a new VLAN ID.
FID - lower part
of screen
(Modifiable)
Display the FID currently associated with the VLAN typed
in the VLAN ID field. A new number can be typed into the
FID field to reassign the VLAN to a different filtering
database. Each VLAN will default to a FID that matches its
VLAN ID and can be changed to a FID from 1 to 1094.
VLAN Name -
lower part of
screen
Assign or change names of VLANs. The VLAN Name
(with up to 32 characters) is an optional attribute of a
VLAN, and is not required for VLAN operation.
(Modifiable)
ADD/DEL
(Toggle)
Toggle the action taken between adding the entered VLAN
to the switch or deleting the selected VLAN from the
switch.
802.1Q VLAN User’s Guide
3-9
Chapter 3: VLAN Configuration
3.4.1
Defining a VLAN
To define a VLAN, proceed as follows:
1. Use the arrow keys to highlight the VLAN ID field.
2. Enter the VLAN ID using a unique number between 2 and 4094. The
VLAN IDs of 0, 1, and 4095 may not be used for user-defined VLANs.
If an illegal number is entered, the Event Message Line will display:
”PERMISSIBLE RANGE FOR VLAN IDS: 2 to 4094” and the field
will refresh with the previous value.
Each VLAN ID must be unique. If a duplicate VLAN ID is
entered, the switch assumes that the Administrator intends to
NOTE
modify the existing VLAN.
3. If the VLAN is to be assigned to a different filtering database, use the
arrow keys to highlight the FID field. If the VLAN is not going to be
assigned to a different FID, go to step 5.
4. Type in the ID number of the FID.
5. Use the arrow keys to highlight the VLAN Name field.
6. Type a name of up to 32 ASCII characters in the VLAN Name field.
This is an optional attribute of a VLAN, and is not required for VLAN
operation.
7. Use the arrow keys to highlight the ADD/DEL field.
8. Press the SPACE bar to select ADD for a defined VLAN. Press
ENTER. The new VLAN will be added to the VLAN list. The message
“VLAN ADDED” displays in the Event Message Line in the upper
left-hand corner of the screen.
The VLAN will not be saved to the switch until the configuration is
saved.
9. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. The message “SAVED OK” displays.
3-10
802.1Q VLAN User’s Guide
Device VLAN Configuration Screen
3.4.2
Changing the VLAN to FID Association
To change the association of a VLAN to a FID, proceed as follows:
1. Use the arrow keys to highlight the VLAN ID field.
2. Enter the VLAN ID of the VLAN of which the FID association is to
be changed.
If an illegal number is entered, the Event Message Line will display:
”PERMISSIBLE RANGE FOR VLAN IDS: 2 to 4094” and the field
will refresh with the previous value.
3. Use the arrow keys to highlight the FID field.
4. Type in the ID number of the FID. If the ID number is valid, the Event
Message Line in the upper left hand corner of the screen displays
“VLAN # UPDATED”, where # represents the entered ID number.
5. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. The message “SAVED OK” displays.
3.4.3
Renaming a VLAN
To change the name of an existing VLAN, proceed as follows:
1. Enter the VLAN ID. The VLAN Name field will automatically update
to display the VLAN’s current name.
2. Use the arrow keys to highlight the VLAN Name field.
3. Type a name of up to 32 ASCII characters in the VLAN Name field.
Press ENTER. If the name is valid, the Event Message Line in the
upper left hand corner of the screen displays “VLAN # UPDATED”,
where # represents the entered VLAN name.
4. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. The message “SAVED OK” displays.
802.1Q VLAN User’s Guide
3-11
Chapter 3: VLAN Configuration
3.4.4
Deleting a VLAN
To delete a VLAN from the current VLAN list, proceed as follows:
1. Enter the VLAN ID. The VLAN Name field will automatically update
to display the VLAN’s name if that VLAN has been previously
configured.
2. Use the arrow keys to highlight the ADD/DEL field.
3. Press the SPACE bar to select DEL. Press ENTER. The VLAN is
removed from the list. The message “VLAN DELETED” displays in
the Event Message Line in the upper left-hand corner of the screen.
4. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. The message “SAVED OK” displays.
The default VLAN cannot be deleted from the list.
NOTE
3.4.5
Enabling VLANs
To enable a VLAN, proceed as follows:
1. Use the arrow keys to highlight the Admin Status field of the selected
VLAN.
2. Press the SPACE bar to toggle the field to display Enabled.
3. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
4. Press ENTER. The message “SAVED OK” displays.
3.4.6
Disabling VLANs
To disable a VLAN, proceed as follows:
1. Use the arrow keys to highlight the Admin Status field of the selected
VLAN.
2. Press the SPACE bar to toggle the field to display Disabled.
3. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
3-12
802.1Q VLAN User’s Guide
Device VLAN Configuration Screen
4. Press ENTER. The message “SAVED OK” displays.
The default VLAN cannot be disabled.
NOTE
3.4.7
Changing the Forwarding Mode
To change the forwarding mode of the switch, proceed as follows:
1. Use the arrow keys to highlight the Forward Default VLAN Out All
Ports field.
2. Press the SPACE bar or BACKSPACE to toggle between YES and
NO. The YES selection places the default VLAN (VLAN ID=1) in the
Port VLAN Lists of all ports on the switch. The NO selection removes
the default VLAN from the Port VLAN Lists of all ports, unless those
ports have a PVID of 1 (those belonging to only the Default VLAN).
3. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
4. Press ENTER. The message “SAVED OK” displays.
3.4.8
Paging Through the VLAN List
To display additional VLANs that do not display in the current VLAN
List as shown on the screen, use the NEXT or PREVIOUS commands
located at the bottom of the screen, as follows:
The NEXT and PREVIOUS fields will only display if there are
further VLAN List entries to page through.
NOTE
1. To display the next screen, use the arrow keys to highlight NEXT.
Press ENTER to view the entries on the next screen.
2. To display the previous screen, use the arrow keys to highlight
PREVIOUS. Press ENTER to view the entries on the previous screen.
802.1Q VLAN User’s Guide
3-13
Chapter 3: VLAN Configuration
3.5
PORT ASSIGNMENT CONFIGURATION SCREEN
When to Use
To select a mode of operation for each port and to assign a Port VLAN
Identification (PVID) to each port.
How to Access
Use the arrow keys to highlight the PORT ASSIGNMENT
CONFIGURATION menu item on the 802.1Q VLAN Configuration
Menu screen and press ENTER. The Port Assignment Configuration
screen displays.
Screen Example
6C105 LOCAL MANAGEMENT
Port Assignment Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
VLAN Name
VLAN ID
FID
Port
Port Mode
Default VLAN
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
0001
0001
0001
0001
0001
0001
0001
0001
0001
0001
0001
0001
1
2
3
4
5
6
7
8
[1D TRUNK]
[1Q TRUNK]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
9
10
11
12
RETURN
SAVE
PREVIOUS
NEXT
EXIT
25992-06
Figure 3-6 Port Assignment Configuration Screen
3-14
802.1Q VLAN User’s Guide
Port Assignment Configuration Screen
Field Definitions
Table 3-3 Port Assignment Configuration Screen Field Definitions
Use this field …
To …
Port
(Read-Only)
See the port numbers of the interfaces of the current
module.
Port Mode
(Selectable)
Display the current operational mode for the
corresponding port and select one of three modes:
HYBRID, 1Q TRUNK, or ID TRUNK. The default is
HYBRID.
VLAN ID
(Selectable)
Select the ID number of the VLAN that is associated with
the current port (Port VLAN ID). This is the VLAN ID into
which any untagged frame will be classified. The default
PVID is 0001.
FID (Read-Only)
Display the FID associated with the VLAN ID. This field
updates as the associated VLAN ID field is changed.
VLAN Name
(Read-Only)
Display the name that is associated with the current
VLAN ID. If a name was not assigned to a VLAN, “NOT
DEFINED” displays as the VLAN name.
3.5.1
Changing the Port Mode
To change the operational mode of a port, proceed as follows.
1. Use the arrow keys to highlight the PORT MODE field for the
module and port combination you wish to change.
2. Use the SPACE bar or BACKSPACE key to step through the available
selections. A port may be configured for any of the following modes:
•
HYBRID – This is the default mode for all ports on the switch.
The initial PortVLAN List includes the PVID with a frame format
of untagged. Any other VLANs desired for the Port VLAN List
need to be manually configured. By changing the default mode to
1Q Trunk or 1D Trunk, the Port VLAN List and the associated
frame type are automatically configured.
802.1Q VLAN User’s Guide
3-15
Chapter 3: VLAN Configuration
•
1Q TRUNK – This mode sets the port for transmitting to another
802.1Q aware device. In this mode, all frames are transmitted with
a tag header included in the frame (excluding BPDUs). The switch
will drop all untagged frames it receives on the 1Q Trunk port. The
Port VLAN List for the port includes all VLANs.
•
1D TRUNK – This mode sets the port for transmitting to a legacy
802.1D switch fabric. In this mode, all incoming frames are
classified into the default VLAN and all frames are transmitted
untagged. The switch expects to receive only untagged frames
through the 1D Trunk port. This mode also updates the Port
VLAN List and makes the port eligible to transmit frames for all
VLANs. The 1D Trunk mode can be used in conjunction with the
“Forward DefaultVLAN OutAll Ports” parameter and the Default
VLAN to allow all stations on a legacy portion of the network to
access all stations or servers in the 802.1Q portion of the network.
3. When the desired operational mode for the port is displayed, use the
arrow keys to highlight the SAVE command at the bottom of the
screen.
4. Press ENTER. The message “SAVED OK” displays.
3.5.2
Assigning a VLAN ID
each port’s VLAN ID (PVID) by stepping through a list of all configured
VLANs. To assign a VLAN ID to a port in this manner, perform the
following steps:
It may be necessary to use the NEXT and PREVIOUS
commands to page through the available ports. For
NOTE
instructions, refer to Section 3.5.3.
1. Use the arrow keys to highlight the VLAN ID field for the port
combination you wish to change.
2. Use the SPACE bar or BACKSPACE key to step sequentially through
the previously configured VLAN ID numbers. Only existing VLAN
IDs will be displayed.
3-16
802.1Q VLAN User’s Guide
Port Filtering Configuration Screen
New VLAN IDs must be created with the functions available on
the Device VLAN Configuration screen, discussed in
Section 3.4.
NOTE
3. When the desired VLAN ID is displayed, use the arrow keys to
highlight the SAVE command at the bottom of the screen.
4. Press ENTER. The message “SAVED OK” displays.
3.5.3
Paging Through the Port List
To display additional ports that do not display in the current screen, use
the NEXT or PREVIOUS commands at the bottom of the screen, as
follows:
The NEXT and PREVIOUS fields will only display if there are
further Port List entries to page through.
NOTE
1. To display the next screen, use the arrow keys to highlight NEXT.
Press ENTER to view the entries on the next screen.
2. To display the previous screen, use the arrow keys to highlight
PREVIOUS. Press ENTER to view the entries on the previous screen.
3.6
PORT FILTERING CONFIGURATION SCREEN
When to Use
To perform the following functions:
•
•
•
Select a port and view a list ofVLANs that are configured to have their
frames transmitted out that port.
Filter out certain incoming frames according to the VLAN List and
prevent them from being switched and transmitted out another port.
Filter out of all incoming untagged frames so they will not be
transmitted out another port.
802.1Q VLAN User’s Guide
3-17
Chapter 3: VLAN Configuration
How to Access
Use the arrow keys to highlight the PORT FILTERING
CONFIGURATION menu item on the 802.1Q VLAN Configuration
Menu screen and press ENTER. The Port Filtering Configuration screen
displays.
Screen Example
6C105 LOCAL MANAGEMENT
Port Filtering Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
Port VLAN List
VLAN ID VLAN Name
0001
0003
0004
0012
0014
0020
Default VLAN
Not Defined
Not Defined
Not Defined
Not Defined
Not Defined
Filter Using VLAN Lists: [NO]
Port: [002]
Filter All Untagged Frames: [NO]
RETURN
SAVE
PREVIOUS
NEXT
EXIT
25992-07
Figure 3-7 Port Filtering Configuration Screen
3-18
802.1Q VLAN User’s Guide
Port Filtering Configuration Screen
Field Definitions
Table 3-4 Port Filtering Configuration Screen Field Definitions
Use this field …
To …
VLAN ID
(Read-Only)
See the VLAN ID of the VLANs that are configured to have
their frames transmitted out the port selected in the Port #
field.
VLAN Name
(Read-Only)
See the names of the VLANs associated with the VLAN
ID. If a VLAN does not have a name, “Not Defined” is
displayed.
Port
(Selectable)
To step to the port number of the interface being
configured including the selection of ALL ports.
Filter Using
VLAN Lists
(Toggle)
Filter out (drop) frames that are classified, via their VLAN
tag, as belonging to a VLAN that is not on the Port VLAN
List and prevent them from being forwarded by the switch.
This field toggles between YES and NO.YES enables
filtering according to the Port VLAN List. NO allows the
switch to forward the frames. The default is NO.
Filter All
Untagged
Frames
To filter out all incoming untagged frames so they will not
be forwarded by the switch. This field toggles between
YES and NO.YES enables the filtering of untagged
frames. NO allows the switch to forward untagged frames.
The default is NO.
(Toggle)
3.6.1
Displaying VLAN IDs Associated with a Port
To display the VLAN IDs and VLAN Names of the VLANs associated
with a particular port, proceed as follows:
1. Use the arrow keys to highlight the Port field.
2. Use the SPACE bar or BACKSPACE key to step through the available
port selections. The screen displays the Port VLAN List of the selected
Port. If ALL is selected, no VLAN ID or VLAN Name information is
displayed under Port VLAN List.
3. To display additional VLANs that do not display in the current screen
display, use the NEXT or PREVIOUS commands located at the
bottom of the screen, as follows:
802.1Q VLAN User’s Guide
3-19
Chapter 3: VLAN Configuration
The NEXT and PREVIOUS fields will only display if there are
further VLANs in the list to page through.
NOTE
4. To display the next screen, use the arrow keys to highlight NEXT.
Press ENTER to view the entries on the next screen.
5. To display the previous screen, use the arrow keys to highlight
PREVIOUS. Press ENTER to view the entries on the previous screen.
3.6.2
Selecting the Type of Filtering for a Port
A port can be set to filter out received frames according to its Port VLAN
List. This keeps them from being transmitted and drops all untagged
frames from being transmitted. To set this type of filtering, proceed as
follows:
1. Use the arrow keys to highlight the Port # field.
2. Use the SPACE bar or BACKSPACE key to step through the available
port selections.
3. Use the arrow keys to highlight the Filter Using VLAN List field.
4. Use the SPACE bar or BACKSPACE key to toggle between YES and
NO. When set to YES, the switch will drop all incoming frames that
are classified with a VLAN tag of a VLAN that does not appear on the
Port VLAN List. The default is NO.
5. Use the arrow keys to highlight the Filter All Untagged Frames field.
6. Use the SPACE bar or BACKSPACE key to toggle between YES or
NO. When set to YES, the switch will drop all incoming frames that
do not have a VLAN tag header. The default is NO.
7. To save the settings, Use the arrow keys to highlight the SAVE
command at the bottom of the screen.
8. Press ENTER. The message “SAVED OK” displays. The settings are
saved.
3-20
802.1Q VLAN User’s Guide
VLAN Forwarding Configuration Screen
3.7
VLAN FORWARDING CONFIGURATION SCREEN
When to Use
To perform the following functions:
•
•
•
View the ports included in a VLAN’s Forwarding List.
Define which ports to include in the VLAN’s Forwarding List.
Specify the formats of the frames (Tagged or Untagged) that a VLAN
port will forward.
How to Access
Use the arrow keys to highlight the VLAN FORWARDING
CONFIGURATION menu item on the 802.1Q VLAN Configuration
Menu screen and press ENTER. The VLAN Forwarding Configuration
screen displays.
Screen Example
6C105 LOCAL MANAGEMENT
VLAN Forwarding Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
Current VLAN Ports
Port 15
Port Type
Frame Format
Untagged
Untagged
Untagged
Untagged
Untagged
Untagged
Tagged
Etherent Frontpanel
Etherent Frontpanel
Etherent Frontpanel
Etherent Frontpanel
Etherent Frontpanel
Etherent Frontpanel
ATM ELAN Finance
ATM PVC VCI-1 VP!-23
Port 17
Port 20
Port 23
Port 24
Port 25
Port 35
Port 30
Untagged
VLAN ID: [4094]
VLAN Name: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[DELETE]
Port: [30]
ATM PVC VCI-1 VPI-23
PREVIOUS NEXT
Frame Type: [Untagged]
RETURN
SAVE
EXIT
25991-08
Figure 3-8 VLAN Forwarding Configuration Screen
802.1Q VLAN User’s Guide
3-21
Chapter 3: VLAN Configuration
Field Definitions
Table 3-5 VLAN Forwarding Configuration Screen Field Definitions
Use this field …
To …
Current VLAN
Ports
See the ports that are currently configured to transmit
frames classified to the selected VLAN.
(Read-Only)
Port Type
(Read-Only)
See the MIB2 interface description for the selected switch
port.
Frame Format
(Read-Only)
See the frame format (Tagged or Untagged) for the frames
of the selected VLAN that the port will transmit.
VLAN ID
(Selectable)
Select the identification of the VLAN under examination.
This screen displays the list of ports currently configured
to transmit frames for the VLAN ID in this field.
VLAN Name
See the name associated with the VLAN ID.
(Read-Only)
ADD/DELETE
(Toggle)
Swap the action taken to add or delete a port from the
VLAN Forwarding List.
Port (Selectable)
Select the port number of the interface being configured.
The MIB2 interface description of the port appears to the
right of the Port field. In Section 3-8, ATM PVC VCI-1
VPI-23 is the Port Type for Port 30.
Frame Type
(Toggle)
Select the format of frames (Tagged or Untagged) that will
be transmitted by the selected port for this VLAN. The
default is Untagged.
3.7.1
Viewing Current VLAN Ports
To display the VLAN Forwarding List for a particular VLAN, proceed as
follows:
1. Use the arrow keys to highlight the VLAN ID field. Use the SPACE
bar or BACKSPACE to step to the desired VLAN ID and VLAN
Name.
2. Press ENTER. The screen updates to display the VLAN Forwarding
List for the selected VLAN.
3-22
802.1Q VLAN User’s Guide
VLAN Forwarding Configuration Screen
3.7.2
Paging Through VLAN Forwarding List Entries
To display additional entries in the VLAN Forwarding List that do not
appear on the screen, use the NEXT or PREVIOUS commands located at
the bottom of the screen, as follows:
1. To display the next screen, use the arrow keys to highlight NEXT.
Press ENTER to view the entries on the next screen.
2. To display the previous screen, use the arrow keys to highlight
PREVIOUS. Press ENTER to view the entries on the previous screen.
3.7.3
Adding Forwarding List Entries
To add a port to the VLAN Forwarding List, proceed as follows:
1. Use the arrow keys to highlight the VLAN ID field. Use the SPACE
bar or BACKSPACE to step to the desired VLAN ID and VLAN
Name. Press ENTER.
2. Use the arrow keys to highlight the Port field. Step through the
available ports on the module with the SPACE bar or BACKSPACE.
3. Use the arrow keys to highlight the ADD/DELETE field. Press the
SPACE bar to select ADD or DELETE. Press ENTER.
The Forwarding List entry will be added to the list of current VLANs
once the configuration is saved.
4. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
5. Press ENTER. The message “SAVED OK” displays.
The port is added to the VLAN Forwarding List of the selected VLAN.
3.7.4
Deleting Forwarding List Entries
To remove a port from the currently displayed VLAN Forwarding List,
proceed as follows:
1. Use the arrow keys to highlight the VLAN ID field. Use the SPACE
bar or BACKSPACE to step to the desired VLAN ID and VLAN
Name. Press ENTER.
802.1Q VLAN User’s Guide
3-23
Chapter 3: VLAN Configuration
2. Use the arrow keys to highlight the Port field. Step through the
available ports on the module with the SPACE bar or BACKSPACE.
3. Use the arrow keys to highlight the ADD/DELETE field. Press the
SPACE bar to select DEL. Press ENTER.
The Forwarding List entry will be deleted from the list of current
VLANs once the configuration is saved.
4. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
5. Press ENTER. The message “SAVED OK” displays and the port is
deleted from the VLAN Forwarding List of the selected VLAN.
3.7.5
Changing the Frame Format
To change the frame format for a port, proceed as follows:
1. Use the arrow keys to highlight the Port field. Step through the
available ports by pressing the SPACE bar or BACKSPACE.
2. Using the arrow keys, select the Frame Type field. Use the SPACE
bar or BACKSPACE to toggle between Tagged or Untagged.
3. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
4. Press ENTER. The message “SAVED OK” displays.
3.8
PROTOCOL VLAN CONFIGURATION SCREEN
When to Use
To assign a protocol to a VLAN ID on one or more ports on the switch.
This enables the switch to add a particular VLAN identifier with the
specified protocol to each frame that arrives on a configured port. Other
switches receiving the frame will classify the frame according to the
VLAN identifier within the frame. Entries may also be deleted or
modified.
When the frame is transmitted, it is sent to the ports associated with the
VLAN ID as established using the Protocol Port Configuration screen.
3-24
802.1Q VLAN User’s Guide
Protocol VLAN Configuration Screen
How to Access
Use the arrow keys to highlight the PROTOCOL VLAN
CONFIGURATION menu item on the 802.1Q VLAN Configuration
Menu screen and press ENTER. The Protocol VLAN Configuration
screen displays.
Screen Example
2E253-49R LOCAL MANAGEMENT
Protocol VLAN Configuration
Module Type: xxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
VLAN ID
Protocol Type
Configured Ports
0001
0002
0x0800 (IP)
0x0801 (CUSTOM)
ALL PORTS
USER DEFINED PORT LIST
VLAN ID: [ 2 ]
[ ENABLED ]
[ ADD/MODIFY ]
0x0800
Feature Status:
Action:
Configure Ports: [ ALL PORTS ]
Protocol Type:
[
CUSTOM
]
Ether type:
EXIT
SAVE
PREVIOUS
NEXT
RETURN
25991_23
Figure 3-9 Protocol VLAN Configuration Screen
802.1Q VLAN User’s Guide
3-25
Chapter 3: VLAN Configuration
Field Definitions
Table 3-6 Protocol VLAN Configuration Screen Field Definitions
Use this field …
To …
VLAN ID - upper
part of screen
(Selectable)
Display the VLAN IDs currently configured and may be
selected after the screen is saved to call up the Protocol
Ports Configuration screen using the ENTER key.
Protocol Type -
upper part of
screen
Display the protocol type associated with the VLAN ID in
the VLAN ID column. This field may be selected after the
screen is saved to call up the Protocol Ports Configuration
screen.
(Selectable)
Configured
Ports
(Selectable)
Indicate if a VLAN ID and Protocol Type applies to all
configurable ports or only those listed in the Protocol
Ports Configuration screen for that Priority and Protocol
existing virtual interfaces (such as for ATM).
VLAN ID
(Modifiable)
Enter the VLAN ID which will be assigned to a protocol.
The VLAN ID may be one already created or a new one. If
a new VLAN ID is entered, it will be added to the VLAN
Configuration with a FID of the same value as the VLAN
ID and a VLAN name of PROTOCOL VLAN. To enter the
VLAN IDs, refer to Section 3.8.2.
Configure Ports
(Toggle)
Apply the priority and protocol type to all or none of the
configurable ports. The choices are:
ALL PORTS
NO PORTS
NOTE: If ports are added or removed from the port list in
the Priority Ports Configuration screen described in
Section 3.9, the Configured Ports for the particular VLAN
ID and Protocol Type will change from ALL PORTS or NO
PORTS to USER DEFINED PORT LIST in the Protocol
Priority Configuration screen
3-26
802.1Q VLAN User’s Guide
Protocol VLAN Configuration Screen
Table 3-6 Protocol VLAN Configuration Screen Field Definitions (Cont’d)
Use this field …
To …
Protocol Type
Select one of the following protocol types:
(Selectable)
IP – pertains to all IP associated Ether Types (i.e.,
0x0x0800, 0x0806, and, 0x8035).
IPX – pertains to all IPX associated Ether Types (i.e.,
0x8137, 0x8138, and special cases, 0x0100 [LLC Type 1
Encapsulation] and 0x0101 [LLC Type 2 Encapsulation]).
Appletalk – pertains to all Appletalk associated Ether
Types (i.e., 0x809B and 0x80F3).
Netbios – pertains to all Netbios associated Ether Types
(i.e. 0x0102).
Banyan Vines – pertains to all Banyan Vines associated
Ether Types (i.e., 0x0103 and 0x0BAD).
DECNET – pertains to all DECNET associated Ether
Types.
CUSTOM – when this field is chosen, Ether Type “0x0”
displays so the user can input a particular Ether Type.
NOTE: Any Ether type selected or entered in the Ether
type field and saved will become part of the selection in
the protocol field.
For details, refer to Section 3.8.1.
Feature Status
(Toggle)
Enables or disables the entries. The entries can be made
but are not affective until this field is set to ENABLED.The
choices for this field are:
ENABLED
DISABLED
Action
(Toggle)
Used to add or delete an entry (Priority) and its protocol.
This field toggles between [ADD/MODIFY] and [DELETE].
ADD/MODIFY– adds the new Priority and Protocol Type
entries (for example, Priority [0] and Protocol Type
[Banyan Vines]).
DELETE – deletes an existing entry with the associated
priority (for example, Priority [0] and Protocol Type
[Banyan Vines]).
802.1Q VLAN User’s Guide
3-27
Chapter 3: VLAN Configuration
Table 3-6 Protocol VLAN Configuration Screen Field Definitions (Cont’d)
Use this field …
To …
Ether type
(Modifiable)
Enter the values of a new Ether type when CUSTOM is
display, which can be modified. A protocol may have more
that one Ether Type. Any Ether Type greater than 05dc
(hex) and less than ffff (hex) may be entered. The
maximum number of Ether Types configured per switch is
32. If an attempt is made to enter more that 32, an error
message, “ETHER TYPE TABLE FULL” displays.
To enter values of a particular Ether Type, refer to
Section 3.8.2.
3.8.1
Displaying the Current Protocol, VLAN ID, and
Port Assignments
In some instances it may be desirable to see which VLAN IDs and the
associated ports that are currently assigned to a particular protocol. To
display this information, proceed as follows:
1. Use the arrow keys to highlight the Protocol field at the bottom of the
screen.
2. Press the SPACE bar to step to the appropriate protocol.
3. Press ENTER. The screen displays all VLAN IDs and associated ports
currently assigned to the selected protocol.
4. If there is more information than the screen can display, use the NEXT
and PREVIOUS command at the bottom of the screen to display the
information.
3.8.2
Assigning a Protocol Family to a VLAN ID
To assign all Ether Types associated with a Protocol Family to a
VLAN ID, proceed as follows:
The list of Ether Type configurations is searched prior to the list
of “Protocol Family” configurations when a frame is received on
NOTE
a switch. This means that if Ether Type of 0x0800 is configured
on port 10 with VID of 5 and IP is configured on port 10 with
VID of 6, the incoming frame will receive the VID 5 as Ether
Types have priority over “Protocol Family”.
3-28
802.1Q VLAN User’s Guide
Protocol VLAN Configuration Screen
1. Use the arrow keys to highlight the VLAN ID field at the bottom of
the screen.
2. Enter the VLAN ID. If a new VLAN ID is entered that has not been
created on the switch, use a unique number between 2 and 4094. The
VLAN IDs of 0, 1, and 4095 may not be used for user-defined VLANs.
A FID will automatically be assigned to the new VLAN ID. The FID
assigned will have the same value.
If an illegal number is entered, the Event Message Line will display:
”PERMISSIBLE RANGE FOR VLAN IDS: 2 to 4094” and the field
will refresh with the previous value.
Each VLAN ID must be unique. If a duplicate VLAN ID is
entered, the switch assumes that the Administrator intends to
NOTE
modify the existing VLAN.
3. Use the arrow keys to highlight the Protocol field at the bottom of the
screen.
4. Use the SPACE bar to step to the appropriate protocol type; IP, IPX,
Appletalk, Netbios, Banyan Vines, DECNET, or CUSTOM. If
CUSTOM is selected, Ether Type 0x0 displays. The user’s own Ether
Type can then be entered if necessary.
Any Ether Type entered in the Ether Type field and saved will
become part of the selection in the Protocol field.
NOTE
To see if there are VLANs currently assigned to the Protocol
displayed in the Protocol field, press ENTER.
TIP
5. Use the arrow keys to highlight the Configure Ports field near the
bottom of the screen.
6. Press the SPACE bar to toggle the field to apply the VLAN ID and
Protocol Type entries to either ALL PORTS or NO PORTS.
802.1Q VLAN User’s Guide
3-29
Chapter 3: VLAN Configuration
7. If CUSTOM was selected in the Protocol Type field, use the arrow
keys to highlight the Ether type field. Otherwise, go to step 9.
8. Enter your particular protocol type in the Ether type field.
9. Use the arrow keys to highlight the Action field.
10. Press the SPACE bar to toggle the field to either ADD/MODIFY or
DELETE the settings selected in the VLAN ID and Protocol Type
fields.
11. Press ENTER and the new settings are displayed under the VLAN ID,
12. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
13. Press ENTER. The message “SAVED OK” displays and the settings
are saved. A particular line of data displayed may now be highlighted
to display the Protocol Ports Configuration screen, as described in
Section 3.8.3, to view, add, or delete ports from the priority in the
highlighted line.
3.8.3
Displaying the Protocol Types on Current Ports
To display the current ports and port types associated with a VLAN ID,
the Protocol Ports Configuration screen must be displayed. While in that
screen, ports and their port type may be added to, or current ones deleted
from, the VLAN ID. To access the Protocol Ports Configuration screen,
proceed as follows:
1. Highlight the line of information containing the VLAN ID of interest
to display the current ports and port types associated with that VLAN
ID. The entries in the line of information must have been saved before
you can select it to display the Protocol Ports Configuration screen.
2. Press ENTER. The Protocol Ports Configuration screen displays,
showing all current ports and port types associated with that
VLAN ID. For more information about the Protocol Ports
Configuration screen and how to use it, refer to Section 3.9.
3-30
802.1Q VLAN User’s Guide
Protocol Ports Configuration Screen
3.9
PROTOCOL PORTS CONFIGURATION SCREEN
When to Use
To display the current ports and port types associated with a VLAN and
protocol selected in the Protocol VLAN Configuration screen described in
Section 3.8.
The line of information selected must have been saved before it
can be used to access the Protocol Ports Configuration screen
NOTE
as described below.
How to Access
Use the arrow keys to highlight a line of information under the VLAN
ID/Protocol Type/Configured Ports BitMap columns in the Protocol
Priority Configuration screen and press ENTER. The Protocol Ports
Configuration screen displays.
Screen Example
6C105 LOCAL MANAGEMENT
Protocol Ports Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
Current Protocol Ports
Port Type
15
30
Ethernet
ATM PVC VCI-1 VPI-23
VLAN ID :
Protocol: 0X800
1
[ DELETE ALL PORTS ]
Port: [ 31]
ATM PVC VCI-1 VPI-23
SAVE
PREVIOUS
NEXT
EXIT
RETURN
2599_24
Figure 3-10 Protocol Ports Configuration Screen
802.1Q VLAN User’s Guide
3-31
Chapter 3: VLAN Configuration
Field Definitions
Table 3-7 Protocol Ports Configuration Screen Field Definitions
Use this field …
To …
Current
Display the current ports associated with the VLAN ID.
Protocol Ports
(Read-Only)
Port Type
(Read-Only)
Display the Port Type associated with the port in the
Current Ports column.
VLAN ID
(Read-Only)
Display the VLAN ID that is in the line of information
highlighted in the Protocol VLAN Configuration screen.
Protocol
(Read-Only)
Display the protocol in the line of information highlighted in
the Protocol VLAN Configuration screen.
Port
(Selectable)
Step through the ports to select a port to add of deleted
from the VLAN ID shown in the VLAN ID field.When a port
right of the port number. In Figure 3-10, the port is 31 and
the associated port type is, ATM PVC VCI-1 VPI-23.
DELETE ALL
PORTS
(Selectable)
Add or delete a port selected in the Port field of the VLAN
ID displayed, or add all ports to, or deleted all ports that
are configurable on the device. All ports includes, all
physical and virtual ports such as ATM ports if supported.
In Figure 3-10, the priority is “0”. The selections are as
follows:
ADD PORT – adds the port selected in the Port field.
ADD ALL PORTS – adds ALL PORTS that are
configurable to the VLAN ID shown in the VLAN ID field.
DELETE PORT – deletes the port selected in the Port
field.
DELETE ALL PORTS – deletes ALL PORTS that are
configurable from the VLAN ID shown in the VLAN ID
field.
3-32
802.1Q VLAN User’s Guide
Quick VLAN Walkthrough
3.9.1
Adding/Deleting Ports Associated with a VLAN ID
To add or delete ports from a VLAN, proceed as follows:
1. Use the arrow keys to highlight the Port field.
2. Press the SPACE bar to step to the appropriate port number. The
associated protocol is displayed for that port.
3. Use the arrow keys to highlight the DELETE ALL PORTS field.
4. Press the SPACE bar to step to the appropriate selection to ADD
PORT,ADDALL PORTS, DELETE PORT, or DELETE ALL PORTS
from the VLAN ID shown in the VLAN ID field.
5. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
6. Press ENTER. The message “SAVED OK” displays and the settings
are saved.
3.10 QUICK VLAN WALKTHROUGH
The procedures below provide a short tutorial walkthrough that presents
each of the steps necessary to configure a new VLAN, assign a port to it,
and check the Port VLAN List of the port. You may wish to follow this
walkthrough from start to finish before attempting to configure your own
VLANs.
This walkthrough begins at the 802.1Q VLAN Configuration Menu
screen for a 6C105 chassis. Follow the instructions in your device user’s
guide to navigate to this Local Management screen.
The screens displayed by your devices may be marginally
different from those shown in the illustrations for this
NOTE
walkthrough.
1. On the 802.1Q VLAN Configuration Menu screen, use the arrow keys
to highlight the DEVICE VLAN CONFIGURATION menu item.
Press ENTER. The Device VLAN Configuration screen displays.
2. In this walkthrough, we will not change the setting of the Forward
Default VLAN Out All Ports fields from their default setting of NO.
802.1Q VLAN User’s Guide
3-33
Chapter 3: VLAN Configuration
3. Use the arrow keys to highlight the VLAN ID field. Assign a number
to a new VLAN by typing the number “2” in the VLAN ID field.
4. Use the arrow keys to highlight the FID field. In this example we will
assign the new VLAN to FID 2 by typing the number “2” in the FID
field.
5. Use the arrow keys to highlight the VLAN Name field. Type “TEST
VLAN” in the VLAN Name field. Press ENTER.
6. Use the arrow keys to highlight the ADD/DEL field.
7. Press the SPACE bar to toggle the field to ADD. Press ENTER. The
8. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. The message “SAVED OK” displays. The
screen refreshes and VLAN 2, the TEST VLAN has been added to the
Device VLAN Configuration screen and all learning of MAC
addresses will be updated in FID 2. The screen should now look like
Figure 3-11.
This new VLAN is currently disabled, as the DISABLED field to
the far right shows. When all the rules and settings for the
NOTE
VLAN are in place, it will be necessary to return to this screen
and enable the VLAN.
3-34
802.1Q VLAN User’s Guide
Quick VLAN Walkthrough
6C105 LOCAL MANAGEMENT
Device/VLAN Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
Forward Default VLAN Out All Ports: [NO]
Admin Status
[Enabled]
VLAN ID
FID
1
VLAN Name
DEFAULT VLAN
TEST VLAN
1
2
2
[Disabled]
VLAN ID: 1
FID: 2
VLAN Name: TEST VLAN
[ADD]
RETURN
SAVE
EXIT
25993-09
Figure 3-11 Walkthrough Stage One
It is now time to assign a port to this new VLAN.
9. Use the arrow keys to highlight the RETURN command at the bottom
of the screen. Press ENTER. The 802.1Q VLAN Configuration Menu
screen displays. Use the arrow keys to select the PORT
ASSIGNMENT CONFIGURATION menu item and press ENTER.
The Port Assignment Configuration screen displays.
For the purposes of this walkthrough, port 3 will be configured.
NOTE
10. Use the arrow keys to highlight the VLAN ID field for the module and
port combination you wish to change.
As this port will connect to a single workstation, and is not to be
used for switch-to-switch communications, it is not necessary
NOTE
to change the PORT MODE from the default setting of
HYBRID.
802.1Q VLAN User’s Guide
3-35
Chapter 3: VLAN Configuration
11. Use the SPACE bar to step sequentially through the previously
configured VLAN ID numbers. When the number 0002 (the new
VLAN ID) is displayed, the FID field updates to 0002, and the VLAN
VLAN.
12. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. The PVID for Port 3 is now configured to
the TEST VLAN. The TEST VLAN is also added to the Port VLAN
List for Port 3 with a frame format of Untagged. The screen should
now look like Figure 3-12.
6C105 LOCAL MANAGEMENT
Port Assignment Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
VLAN Name
VLAN ID
FID
Port
Port Mode
Default VLAN
Default VLAN
TEST VLAN
[0001]
[0001]
[0002]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
0001
0001
0002
0001
0001
0001
0001
0001
0001
0001
0001
0001
1
2
3
4
5
6
7
8
[1D TRUNK]
[1Q TRUNK]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
Default VLAN
9
10
11
12
RETURN
SAVE
PREVIOUS
NEXT
EXIT
25992-10
Figure 3-12 Walkthrough Stage Two
Now that port 3 belongs to the TEST VLAN, we will designate one port
as a 1Q Trunk port for a connection to another VLAN aware switch. This
1Q Trunk port will carry traffic from all VLANs, allowing VLAN frames
to maintain their VLAN ID across multiple switches.
For the purposes of this walkthrough, port 10 will be configured
as the trunk port.
NOTE
3-36
802.1Q VLAN User’s Guide
Quick VLAN Walkthrough
13. Use the arrow keys to highlight the Port Mode field for port 10. Use
possible settings of the port until 1Q TRUNK is displayed.
14. Use the arrow keys to highlight the SAVE command at the bottom of
the screen. Press ENTER. Port 10 is now acting as a 1Q Trunk port and
every VLAN is in its Port VLAN List. The frame format for every
VLAN is also set to tagged. The screen should now look like
Figure 3-13.
6C105 LOCAL MANAGEMENT
Port Assignment Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
VLAN Name
VLAN ID
Port
Port Mode
DEFAULT VLAN
DEFAULT VLAN
TEST VLAN
[0001]
[0001]
[0002]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
[0001]
1
2
3
4
5
6
7
8
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[HYBRID]
[1Q TRUNK]
[HYBRID]
[HYBRID]
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
DEFAULT VLAN
9
10
11
12
RETURN
SAVE
PREVIOUS
NEXT
EXIT
25991-11
Figure 3-13 Walkthrough Stage Three
Now that the TEST VLAN and the 1Q Trunk connection are set up, we
can proceed to activate the TEST VLAN.
802.1Q VLAN User’s Guide
3-37
Chapter 3: VLAN Configuration
15. On the 802.1Q VLAN Main Menu screen, use the arrow keys to
highlight the DEVICE VLAN CONFIGURATION menu item.
Press ENTER. The Device VLAN Configuration screen, Figure 3-14,
displays.
6C105 LOCAL MANAGEMENT
Device/VLAN Configuration
Module Type: xxxxx-xx
Slot Number: xx
Firmware Revision:
XX.XX.XX
BOOTPROM Revision: XX.XX.XX
Forward Default VLAN Out All Ports: [NO]
Admin Status
[Enabled]
VLAN ID
FID
1
VLAN Name
DEFAULT VLAN
TEST VLAN
1
2
2
[Enabled]
VLAN ID: 1
FID: 2
VLAN Name: DEFAULT VLAN
[ADD]
RETURN
SAVE
EXIT
25993-12
Figure 3-14 Walkthrough Stage Four
16. Use the arrow keys to highlight the Admin Status field of
VLAN ID 2, the TEST VLAN.
17. Press the SPACE bar to toggle the field to display Enabled.
18. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
19. Press ENTER. The message “SAVED OK” displays. The switch
activates the new VLAN.
This effectively completes the configuration of a single VLAN, assigning
it to a port, and configuring the switch to forward the frames received on
that port to be forwarded with the VLAN information included in the
frame.
3-38
802.1Q VLAN User’s Guide
Quick VLAN Walkthrough
The Port VLAN List of any port on the device can also be checked at any
time using the Port Filtering Configuration screen. A list of all ports
eligible to transmit frames for a given VLAN will also be listed on the
VLAN Forwarding Configuration screen. Each port can also be set to
filter out (drop) incoming frames that have VLAN tags that do not match
with any of those in its Port VLAN List, and also filter out all untagged
frames received by the port. As a default neither function is activated.
In this walkthrough, we will show how to display the Port VLAN List of
port 10 and set the port to filter out all untagged frames that it receives.
20. On the 802.1Q VLAN Main Menu screen, use the arrow keys to
highlight the PORT FILTERING CONFIGURATION menu item.
Press ENTER. The Port Filtering Configuration screen displays.
21. Use the arrow keys to highlight the Port field.
22. Press the SPACE bar to step the field to display 2.
23. Use the arrow keys to highlight the Filter All Untagged Frames field.
25. Use the arrow keys to highlight the SAVE command at the bottom of
the screen.
26. Press ENTER. The message “SAVED OK” displays. The Port
Filtering Configuration screen displays the Port VLAN List for port 2
and the Filtering All Untagged Names field is set to YES as shown in
Figure 3-15.
802.1Q VLAN User’s Guide
3-39
Chapter 3: VLAN Configuration
6C105 LOCAL MANAGEMENT
Port Filtering Configuration
Firmware Revision:
BOOTPROM Revision: XX.XX.XX
Module Type: xxxxx-xx
Slot Number: xx
XX.XX.XX
Port VLAN List
VLAN ID
0001
VLAN Name
DEFAULT VLAN
1Q TRUNK
0001
Filter Using VLAN Lists: [NO]
Filter All Untagged Frames: [YES]
Port : [10]
RETURN
SAVE
PREVIOUS
NEXT
EXIT
25992-20
Figure 3-15 Final Walkthrough Stage
This effectively completes the displaying of the Port VLAN List and the
setting of the port filtering of all untagged frames.
3-40
802.1Q VLAN User’s Guide
CHAPTER 4
EXAMPLES
This chapter provides examples of how VLAN aware SmartSwitches can
be configured to group users at the port level to create VLANs in existing
networks. Each example presents a problem and shows how it is solved
by configuring the switches using the VLAN Local Management screens.
The actual procedures and screens used to configure a VLAN aware
switch are covered in Chapter 3, VLAN Configuration. Also provided in
the discussion of each example is a description of how the frames
transmitted from one user would traverse the network to its target device.
4.1
EXAMPLE 1, SINGLE SWITCH OPERATION
This first example looks at the configuration of a single Ethernet switch
for VLAN operation. In this example, two groups of three users are to be
assigned to two VLANs to isolate them from one another. The blue users
(B1, B2, B3) are to be kept completely separate from the red users (R1,
R2, R3). Figure 4-1 shows the initial state of the switch.
802.1Q Switch
R1
R2
R3
B3
B2
1
2
3
4
5
6
B1
2263_11
Figure 4-1 Example 1, Single Switch Operation
802.1Q VLAN User’s Guide
4-1
Chapter 4: Examples
4.1.1
Solving the Problem
To set up this switch, users will be assigned to two new VLANs, red
stations to the Red VLAN, and blue stations to the Blue VLAN. The
information below describes how the switch is configured to create these
two VLANs and how users are assigned to them.
1. First, the switch is set for 802.1Q operation. Since traffic isolation is
to be based on VLAN membership alone, the switch is set so the Red
VLAN is a member of FID 2 and the Blue VLAN is a member of FID
3 from the Device/VLAN Configuration screen.
2. The Administrator uses the Device/VLAN Configuration screen to
define the two VLANs for this switch; the Red VLAN, with a VLAN
ID of 002, and the Blue VLAN, with a VLAN ID of 003.
3. The Administrator brings up the Port Assignment Configuration
screen and assigns the ports to the VLANs.
•
•
Ports 1, 2, and 3: VLAN ID 002 (Red VLAN)
Ports 4, 5, and 6: VLAN ID 003 (Blue VLAN)
4. Now that the ports have been assigned, the VLANs are enabled from
the Device/VLAN Configuration screen.
802.1Q Switch
R1
R2
R2
B3
B2
1
4
VLAN ID 002 VLAN ID 003
2
5
VLAN ID 002 VLAN ID 003
3
6
B1
VLAN ID 002 VLAN ID 003
2263_12
Figure 4-2 Switch Configured for VLANs
4-2
802.1Q VLAN User’s Guide
Example 1, Single Switch Operation
The switch will now classify each frame received as belonging to either
the Red or Blue VLANs. Traffic from one VLAN will not be forwarded to
the members of the other VLAN, and all frames transmitted by the switch
will be normal, untagged Ethernet frames.
4.1.2
Frame Handling
This section describes the operations of the switch when two frames are
received. The first frame is a broadcast sent by station R1.
1. Station R1 transmits the broadcast frame. The switch receives this
frame on Port 1. As the frame is received, the switch classifies it. The
frame is untagged, so the switch classifies it as belonging to the VLAN
that Port 1 is assigned to, the Red VLAN.
2. At the same time, the switch adds the source MAC address of the
frame and the VLAN associated with port 1 to its Source Address
Table in FID 2. In this fashion it learns that station R1 is located out
Port 1.
3. Once the frame is classified, its destination MAC address is examined.
The switch discovers that the frame is a broadcast, and treats it as it
would any other unknown destination MAC address. The switch
forwards the frame out all ports in the Red VLAN’s Forwarding List
except for the one that received the frame. In this case, the frame is
sent to Ports 2 and 3.
The second frame is a unicast, where station R2 responds to station R1’s
broadcast.
4. Station R2, having received and recognized the broadcast from R1,
transmits a unicast frame as a response. The switch receives this frame
on Port 2. The switch classifies this new untagged frame as belonging
to the Red VLAN.
5. The switch adds the source MAC address and VLAN for station R2 to
its Source Address Table in FID 2, and checks the Source Address
Table for the destination MAC address given in the frame. The switch
finds the MAC address and VLAN in this table, and recognizes that
the MAC address and VLAN match for R1 is located out Port 1.
802.1Q VLAN User’s Guide
4-3
Chapter 4: Examples
6. The switch examines its VLAN configuration information and
determines that the frame for Red VLAN is allowed to be forwarded
out Port 1 and that it must be sent in an untagged format.
7. The switch forwards the frame out Port 1. Any other unicast
transmissions between stations R1 and R2 will be handled identically.
4.2
EXAMPLE 2, VLANS ACROSS MULTIPLE
SWITCHES
This second example investigates the steps that must be taken to set up
VLANs across multiple 802.1Q VLAN switches. This includes the
configuration and operation of 1Q Trunks between 802.1Q VLAN
switches.
As shown in Figure 4-3, two companies, “Redco” and “Blue Industries”,
share floors 2 and 4 in a building where the network infrastructure is
supplied by the building owner. The objective is to completely isolate the
network traffic of the two companies by limiting the user’s traffic through
the ports of two switches, thus maintaining security and shielding the
network traffic from each company. This example will show the use and
configuration of a 1Q Trunk connection and the creation of VLANs across
multiple switches.
4-4
802.1Q VLAN User’s Guide
Example 2, VLANs Across Multiple Switches
Redco
Blue Industries
2
Bridge 1
Bridge 2
User A
1
3
4
Blue VLAN
Red VLAN
4
Floor 4
Floor 3
Redco
Blue Industries
File Server
2
File Server
Bridge 4
Bridge 3
1
3
2
Blue VLAN
Red VLAN
Floor 2
Floor 1
User
802.1D Legacy Bridge
802.1Q VLAN Aware Switch
22632_13
Figure 4-3 Example 2, VLANs Across Multiple Switches
4.2.1
Solving the Problem
To solve the problem in this example, the users are assigned to VLANs
using Switch 4 and Switch 2 as shown in Figure 4-3. Redco users are
assigned to the Red VLAN and Blue Industries users to the Blue VLAN.
The following information shows how Switch 4 and Switch 2 are
configured to create the two VLANs to isolate the users of the two
companies from one another on the network using the existing
infrastructure.
802.1Q VLAN User’s Guide
4-5
Chapter 4: Examples
Switch 4
Switch 4 is set as follows:
1. Two VLANs are added to the list of VLANs in the Device/VLAN
Configuration screen and assigned to a FID. In this example they are
as follows:
•
•
VLAN ID 2, FID 2, with a VLAN Name of Red
VLAN ID 3, FID 3, with a VLAN Name of Blue
Because the VLANs are assigned to two separate FIDs, the users on
VLAN ID 2 and VLAN ID 3 cannot communicate with each other.
2. Ports 1 and 3 are assigned to the Port VLAN ID (PVID) as follows
using the Port Assignment Configuration screen:
•
•
Port 1, VLAN ID: 2 for the Red VLAN
Port 3, VLAN ID: 3 for the Blue VLAN
This causes the switch to classify all untagged frames received as
belonging to the VLAN specified by each port PVID and to replace the
previous PVID information in the port VLAN List with the new PVID
information. This makes Port 1 part of the Red VLAN, Port 3 part of
the Blue VLAN, and both are set as VLAN frame format of untagged.
3. Port 4 is configured as a 1Q Trunk port as follows using the Port
Assignment Configuration screen:
•
Port Mode: 1Q Trunk
Port 4 is set as an 802.1Q Trunk port, which makes the port eligible to
transmit to all VLANs, and all frames forwarded out this port are
forwarded as tagged frames. By default there is no PVID associated
with the trunk port and the port remains as a member of the Default
VLAN. With the original classification information inserted in the
frame Tag Header, the receiving switch will maintain the original
frame classification.
4-6
802.1Q VLAN User’s Guide
Example 2, VLANs Across Multiple Switches
Switch 2
Switch 2 is set as follows:
1. Two VLANs are added to the list of VLANs using the Device/VLAN
Configuration screen and assigned to a FID. In this example they are
as follows:
•
•
VLAN ID 2, FID 2, with a VLAN Name of Red
VLAN ID 3, FID 3, with a VLAN Name of Blue
2. A Port VLAN ID is assigned to each port (1 and 3) as follows using
the Port Assignment screen:
•
•
Port 1, VLAN ID: 223 for the Blue VLAN
Port 3, VLAN ID: 222 for the Red VLAN
These settings change the configuration of the switch, so that Port 1 is
part of Blue VLAN, Port 3 is part of Red VLAN, and both are set as
frame type of untagged.
3. Port 2 is configured as a 1Q Trunk port as follows using the Port
Assignment Configuration screen:
•
Port 2, Port Mode: 1Q Trunk
Port 2 is set as an 802.1Q Trunk port, which makes its Port VLAN List
contain all VLANs and sets all frames forwarded out this port as
tagged frames. This completes the transmission path between
Switch 4 and Switch 2.
802.1Q VLAN User’s Guide
4-7
Chapter 4: Examples
4.2.2
Frame Handling
The following describes how, when User A attempts to log on to the File
Server on Bridge 4, the frames from User A are classified on Switch 4 and
traverse the network. In this example, the MAC address of User A is “Y”
and the MAC address for the File Server is “Z”. The following description
includes illustrations to help understand how the frames flow through the
network.
1. User A sends a frame with a Broadcast Destination Address in an
attempt to locate the File Server. The frame is received on User A’s
port of Bridge 1 and, because the frame is a broadcast frame, it is
transmitted out all ports of Bridge 1 as shown in Figure 4-4.
Redco
Blue Industries
Bridge 2
Blue VLAN
2
Bridge 1
User A
1
3
4
Red VLAN
4
Floor 4
2263_14
Figure 4-4 Bridge 1 Broadcasts Frames
2. Switch 4 receives the frame from Bridge 1 and immediately classifies
it as belonging to the Red VLAN. After the frame is classified,
Switch 4 checks the Destination Address and, upon discovering that it
is a Broadcast Destination Address, forwards the frame out all ports in
the Red VLAN Forwarding List excluding Port 1, which received the
frame. In this example, it is only Port 4.
have a dynamic entry for MAC address “Y” in FID 2. Because
Switch 4 received the frame on Port 1, it does not forward the frame
out that port, but does forward the frame to Port 4.
The frame is transmitted to Switch 2 with a VLAN Tag Header
inserted in the frame. The VLAN Tag Header indicates that the frame
is classified as belonging to the Red VLAN. Figure 4-5 shows the path
taken to this point to reach Switch 2.
4-8
802.1Q VLAN User’s Guide
Example 2, VLANs Across Multiple Switches
The VLAN Tag Header is inserted because Switch 4, Port 4 is
designated as an 802.1Q Trunk port. In this case, the Port Mode setting
for Port 4 is 802.1Q Trunk and the VLAN Frame format for that
VLAN is tagged.
Redco
Blue Industries
Bridge 2
2
Bridge 1
User A
1
3
4
Blue VLAN
Red VLAN
4
Floor 4
Floor 3
Redco
Blue Industries
2
File Server
Bridge 4
Bridge 3
1
3
2
Blue VLAN
Red VLAN
Floor 2
22631_15
Figure 4-5 Transmitting to Switch 4
3. When Switch 2 receives the tagged frame on its Port 2, it checks the
frame’s VLAN Tag Header and determines that the frame is classified
as belonging to the Red VLAN, and that the frame is a broadcast
frame. Switch 2 forwards the frame to all ports in the Red VLAN
example, the only eligible port is Port 3, which connects to Bridge 4.
Switch 2 checks its Forwarding List, which specifies that the VLAN
frame type for that port is untagged. Switch 2 then updates its Source
Address Table in FID 3 for MAC address “Y” if necessary. The
untagged frame is then transmitted out Port 3 to Bridge 4. Bridge 4
forwards the frame out all its ports because it is a broadcast frame, and
the server receives it as shown in Figure 4-6.
802.1Q VLAN User’s Guide
4-9
Chapter 4: Examples
Floor 3
Redco
Blue Industries
2
File Server
Bridge 4
Red VLAN
Bridge 3
Blue VLAN
3
1
2
Floor 2
2263_16
Figure 4-6 Transmitting to Bridge 4
4. The File Server responds with a unicast frame to User A. All switches
between the File Server and User A have an entry in their respective
Source Address Tables identifying which port to use for forwarding
the frame to User A, MAC address “Y” in FID 3. All switches update
their Source Address Tables for the File Server’s MAC address “Z” as
the frame is forwarded through the switch fabric to User A. The
802.1D switches update their Source Address Tables based on the
source MAC address and receive port and the 802.1Q switches update
their databases based on the source MAC address, VLAN, and receive
port.
5. The frame from the File Server is received on Switch 2, and forwarded
to Switch 1 as a tagged frame classified as belonging to the Red
VLAN. Switch 1 removes the tag and forwards the frame to Bridge 1,
which in turn forwards the frame out of the port attached to User A.
All subsequent frames between User A and the File Server are
forwarded through the switch fabric in the same manner.
4.3
EXAMPLE 3, 1D TRUNK CONNECTION TO 802.1Q
VLAN NETWORK
This example illustrates the use of a 1D Trunk to connect a device to a
network of 802.1Q VLAN switches.
In this example, a merger has taken place between the companies in the
previous example, Redco and Blue Industries. The two companies have
become divisions within a single corporation, Green Incorporated.
4-10
802.1Q VLAN User’s Guide
Example 3, 1D Trunk Connection to 802.1Q VLAN Network
As illustrated in Figure 4-7, a third group of stations, the Green
Incorporated staff, is added to the facility. Also, the Green Incorporated
Network Administrators want to add a Mail Server to the network on the
first floor.
User B
2
Bridge 1
Bridge 2
1
3
4
Blue VLAN
Red VLAN
4
Floor 4
Floor 3
2
File Server
Bridge 4
Bridge 3
1
3
2
Blue VLAN
Red VLAN
4
Floor 2
Green Incorporated.
2
Mail Server
1
3
1
Green VLAN
Floor 1
Server
User
802.1D Legacy Bridge
802.1Q VLAN-Aware Switch
22631_17
Figure 4-7 Example 3, 1D Trunk Connection to 802.1Q VLAN Network
The Green Incorporated Network Administrators want to continue to
separate normal network traffic between the Blue and Red VLANs, and
create a new isolated VLAN for Green, Incorporated users. All divisions
in the facility are to have equal access to the Mail Server on the first floor.
802.1Q VLAN User’s Guide
4-11
Chapter 4: Examples
4.3.1
Solving the Problem
Much of the existing network configuration can remain as it was for
Example 2, VLANs Across Multiple Switches. However, the Forward
Default VLAN Out All Ports must be set toYES on Switch 4 and 2, and a
new 1Q Trunk port must be activated and configured on Switch 2. There
are no other real changes to the network above the first floor.
Switch 4
Switch 4 is set as follows:
1. The Forward Default VLAN Out All Ports is set to YES using the
Device/VLAN Configuration screen. This adds the Default VLAN to
the Port VLAN List of every switch port and all VLANs become
members of FID 1. This allows all traffic received from the mail server
via Switch 2 and Switch 1 to be received and classified to the Default
VLAN of Switch 4.
Switch 2
Switch 2 is set as follows:
1. The Forward Default VLAN Out All Ports is set to YES using the
Device/VLAN Configuration screen. This adds the Default VLAN to
the Port VLAN List of every switch port and all VLANs become
members of FID 1.
2. The port mode of Port 4 is set using the Port Assignment screen:
•
Port 4, Port Mode: 1Q Trunk
This causes Port 4 to be set as an additional 802.1Q Trunk port, which
makes its Port VLAN List contain all VLANs, and all frames
forwarded out this port are forwarded as tagged frames.
Switch 1
Switch 1 needs to be added to the network backbone to handle traffic from
the Green Incorporated network and the mail server. To accomplish this
Switch 1 is configured as follows:
1. One VLAN is added to the list of VLANs in the Device/VLAN
Configuration screen. In this example, Switch 1 is set as follows:
•
VLAN ID 4, FID 4, with a VLAN Name of Green
4-12
802.1Q VLAN User’s Guide
Example 3, 1D Trunk Connection to 802.1Q VLAN Network
2. The Forward Default VLAN Out All Ports is set to YES using the
Device/VLAN Configuration screen. This adds the Default VLAN to
the Port VLAN List of every switch port and all VLANs become
members of FID 1.
3. A Port VLAN ID is assigned to Port 1 using the Port Assignment
screen, as follows:
•
Port 1, VLAN ID: 224 for the Green VLAN
This setting changes the configuration of the switch, so that Port 1 is
part of the Green VLAN and is set to transmit a frame type of
untagged.
4. The port mode of Ports 2 and 3 are set using the Port Assignment
screen:
•
•
Port 2, Port Mode: 1Q Trunk
Port 3, Port Mode: 1D Trunk
Port 2 is set as an 802.1Q Trunk port, which makes the port eligible to
transmit frames of all VLANs, and sets all frames forwarded out this
port as tagged frames.
Port 3 is set as a 1D Trunk port, where frames classified as belonging
to any VLAN are forwarded untagged, and received frames are
classified as belonging to the Default VLAN. This allows the Mail
Server to send/receive mail traffic to/from all VLAN users on the
network backbone,
4.3.2
Frame Handling
The following describes how, when User B attempts to contact the Mail
Server on Switch 1, the frames are classified on Switch 4 and traverse the
network.
1. User B sends a broadcast frame in an attempt to contact the Mail
Server. The frame enters Bridge 1 and, being a broadcast, is forwarded
to all ports. Bridge 1 learns User B’s MAC address from the Source
Address field of the frame and adds it to its Source Address Table in
FID 1.
802.1Q VLAN User’s Guide
4-13
Chapter 4: Examples
2. Switch 4 receives the frame and classifies this new untagged frame as
belonging to the Red VLAN. Since the frame is a broadcast, it is
forwarded to any ports that are classified as eligible to receive Red
VLAN frames. Switch 4 also updates its Source Address Table for
FID 1, identifying User B as being located out Port 1.
On Switch 4, the only port eligible to receive Red VLAN frames is
Port 4, the 1Q Trunk. The frame is forwarded out Port 4 with the Red
VLAN Tag header being added, as shown in Figure 4-8.
User B
2
Bridge 1
Bridge 2
1
3
4
Blue VLAN
Red VLAN
4
Floor 4
2263_18
Figure 4-8 Bridge 1 Broadcasts Frames
3. Switch 2 receives the tagged Red VLAN frame on Port 2, as shown in
Figure 4-9. The VLAN Tag in the frame is maintained, classifying the
frame as belonging to the Red VLAN. The switch forwards the
broadcast frame out all the eligible ports, Ports 3 and 4. Switch 2
simultaneously updates its Source Address Table for FID 1 to reflect
the location of User B (Port 2).
The frame forwarded out Port 3 has its VLAN Tag stripped before
transmission, and it is passed to Bridge 4 as a normal broadcast frame.
The frame that is transmitted out Port 4, the 1Q Trunk, retains its
VLAN tag.
4-14
802.1Q VLAN User’s Guide
Example 3, 1D Trunk Connection to 802.1Q VLAN Network
Floor 3
2
File Server
Bridge 4
Bridge 3
1
3
2
Blue VLAN
Red VLAN
4
Floor 2
2263_19
Figure 4-9 Switch 2 Forwards to 1Q Trunk
4. When Switch 1 receives the tagged broadcast frame, it also examines
the tag and classifies the frame as belonging to the Red VLAN. This
broadcast frame is then sent to all ports eligible to receive Red VLAN
frames. In this case only the 1D trunk, Port 3, is eligible, as it is
considered a member of all VLANs for forwarding purposes. The
VLAN Tag is stripped from the frame and the frame is transmitted out
Port 3 as shown in Figure 4-10. The Source Address Table, FID 1 for
Switch 1 is updated to contain User B.
Floor 2
Green, Inc.
2
Mail Server
3
1
1
Green VLAN
4
Floor 1
2263_20
Figure 4-10 Switch 1 Forwards to 1D Trunk
5. The Mail Server receives the broadcast frame and recognizes it. The
Mail Server responds with a unicast frame to User B. This frame
crosses the 1D Trunk and is received by Switch 1. Switch 1 classifies
the unicast frame as belonging to the Default VLAN (the only
membership for the 1D Trunk port).
802.1Q VLAN User’s Guide
4-15
Chapter 4: Examples
Switch 1 checks the Filtering Database for the MAC address of
User B. User B’s MAC address is located, and Port 2 is identified as
User B’s location. The frame is then checked for eligibility and frame
format for Port 2. Since Port 2 is a 1Q Trunk port, it is eligible to
transmit frames for all VLANs. The frame is tagged and transmitted
out Port 2.
The switch also recognizes the MAC address of User B in its Source
Address Table, FID 1, and updates that table to contain the MAC
address and port combination of the Mail Server.
6. This tagged unicast frame is received by Switch 2. The frame is
already tagged as belonging to the Default VLAN, so no classification
needs to be done. The switch recognizes User B’s MAC address in its
Source Address Table, FID 1, and updates that table to contain the
Mail Server’s MAC address and port combination.
The switch checks the Filtering Database for the MAC address of
User B. User B’s MAC address is located, and Port 2 is identified as
the location of User B. The frame is checked for eligibility and frame
format for Port 2. Since Port 2 is a 1Q Trunk port, it is eligible to
transmit frames for all VLANs. The frame is tagged and transmitted
out port 2.
7. Switch 4 receives the frame on its 1Q Trunk port, Port 4, and examines
the frame’s Tag. The frame maintains its Default VLAN classification.
The switch also refers to its Source Address Table, FID 1, to see if it
can locate an entry for User B. User B is found to be located on Port 1.
The switch also updates its Source Address Table, FID 1, with the port
and MAC address combination for the Mail Server.
The switch examines the Filtering Database and locates the MAC
address entry for User B and Port 1. The frame is then checked for
eligibility and frame format for Port 1. As Port 1 is considered eligible
to transmit to the Default VLAN, the frame is transmitted out Port 1
without a VLAN Tag.
8. Bridge 1 receives the frame and recognizes User B’s MAC address.
The frame is forwarded to the correct port and the bridge’s Source
Address Table is updated with an entry for the Mail Server’s MAC
address. User B receives the Mail Server’s response. Any further
unicast traffic between the Mail Server and User B will be handled in
the same fashion by the switches in the network.
4-16
802.1Q VLAN User’s Guide
Example 4, Isolating Network Traffic According to Protocol
4.4
EXAMPLE 4, ISOLATING NETWORK TRAFFIC
ACCORDING TO PROTOCOL
This final example illustrates how to restrict AppleTalk protocol traffic of
a network to prevent unwanted multicast frames from slowing down the
whole network and yet be able to send and receive frames associated with
other protocols.
In this example, illustrated in Figure 4-7, the Publications Department is
relocating from another site to the third floor. This network will consist of
six computers and a printer using several protocols including the
AppleTalk protocol. A characteristic of the AppleTalk protocol is to send
all frames as multicast frames. These multicast frames will be isolated to
a VLAN (Grey VLAN) to prevent them from slowing down the other
networks.
A second VLAN (Yellow VLAN) will be established to handle traffic of
other protocols. The Publications Department users will have access to
the mail server on the first floor along with the Red, Blue, and Green
VLANs.
802.1Q VLAN User’s Guide
4-17
Chapter 4: Examples
User B
2
Bridge 1
Bridge 2
1
1
1
3
3
3
4
4
Blue VLAN
Red VLAN
Floor 4
Publications
Grey VLAN
2
3
7
2
Printer
4
1
5
6
5
8
3
4
Yellow VLAN
Floor 3
2
File Server
Bridge 4
Bridge 3
2
Blue VLAN
Red VLAN
4
Floor 2
Green, Inc.
2
Mail Server
1
3
1
Green VLAN
Floor 1
User
2599_18
Figure 4-11 Example 4, Isolating Traffic According to Protocol
4.4.1
Solving the Problem
Much of the existing network configuration can remain as it was for
Example 3, 1D Trunk Connection to 802.1Q VLAN Network. However,
Switch 3, Switch 5, and the devices that will make up Publication’s Grey
VLAN have been added.
4-18
802.1Q VLAN User’s Guide
Example 4, Isolating Network Traffic According to Protocol
Switch 5 will be configured to isolate all AppleTalk protocol frame traffic
to the devices in the Grey VLAN and all other protocol traffic to the
Yellow VLAN. Switch 3 will link the traffic from Switch 5 to the
buildings network backbone.
Two 1Q Trunk ports must be activated and configured on Switch 3, and
one 1Q Trunk port must be activated and configured on Switch 4.
Ports 2, 3, 4, 5, 6, 7, and 8 of Switch 5 are connected to the Publication
Department devices. These ports will be configured to classify all
AppleTalk frames into the AppleTalk VLAN (Grey). The same ports will
also be configured to classify all other protocol frames into a second
VLAN (Yellow). Port 1 will be assigned to the Yellow VLAN to handle
the traffic between Switch 3 and 5.
Switch 3
Switch 3 is set as follows:
1. One VLAN is added to the list of VLANs in the Device/VLAN
Configuration screen. In this example, Switch 3 is set as follows:
•
VLAN ID 5, FID 5, with a VLAN Name of Yellow
2. The Forward Default VLAN Out All Ports is set to YES using the
Device/VLAN Configuration screen. This adds the Default VLAN to
the Port VLAN List of every switch port and all VLANs become
members of FID 1.
3. A Port VLAN ID is assigned to Port 3 using the Port Assignment
screen, as follows:
•
Port 3, VLAN ID: 5, FID 5
4. The port mode of Ports 2 and 4 are set using the Port Assignment
screen:
•
•
Port 2, Port Mode: 1Q Trunk
Port 4, Port Mode: 1Q Trunk
Ports 2, and 4 are set as 802.1Q Trunk ports, which makes these ports
eligible to transmit frames of all VLANs, and sets all frames
forwarded out these ports as tagged frames. This allows traffic from
Switch 4 to reach Switch 2 on the network backbone.
802.1Q VLAN User’s Guide
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Chapter 4: Examples
Switch 5
Switch 5 is set as follows:
1. Two VLANs are added to the list of VLANs in the Device/VLAN
Configuration screen. In this example, it is set as follows:
•
•
VLAN ID 5, FID 5, with a VLAN Name of Yellow
VLAN ID 6, FID 6, with a VLAN Name of Grey
2. The Forward Default VLAN Out All Ports is set to YES using the
Device/VLAN Configuration screen. This adds the Default VLAN to
the Port VLAN List of every switch port.
3. To allow all frames (except the AppleTalk frames, which will be
prevented in steps 4 and 5) from being transmitted out Port 1 to Switch
3 and the network backbone, Port VLAN IDs are assigned to all switch
ports using the Port Assignment screen, as follows:
•
•
•
•
•
•
•
•
Port 1, VLAN ID: 5 for the Yellow VLAN
Port 2, VLAN ID: 5 for the Yellow VLAN
Port 3, VLAN ID: 5 for the Yellow VLAN
Port 4, VLAN ID: 5 for the Yellow VLAN
Port 5, VLAN ID: 5 for the Yellow VLAN
Port 6, VLAN ID: 5 for the Yellow VLAN
Port 7, VLAN ID: 5 for the Yellow VLAN
Port 8, VLAN ID: 5 for the Yellow VLAN
4. On the Protocol VLAN Configuration screen, the VLAN ID 6 of the
Grey VLAN is assigned to the AppleTalk protocol.
•
VLAN ID 6, Protocol Type: AppleTalk, Status: ADD
This creates the protocol VLAN ID 6 that will handle only AppleTalk
frames and enables ports to be assigned the this VLAN.
4-20
802.1Q VLAN User’s Guide
Example 4, Isolating Network Traffic According to Protocol
5. The AppleTalk frames must now be restricted to Ports 2 through 8 of
the Yellow VLAN. On the Protocol Ports Configuration screen, All
ports except Port 1 are assigned to the AppleTalk protocol, as follows:
•
•
•
•
•
•
•
Port 2, VLAN ID: 6, Protocol: AppleTalk
Port 3, VLAN ID: 6, Protocol: AppleTalk
Port 4, VLAN ID: 6, Protocol: AppleTalk
Port 5, VLAN ID: 6, Protocol: AppleTalk
Port 6, VLAN ID: 6, Protocol: AppleTalk
Port 7, VLAN ID: 6, Protocol: AppleTalk
Port 8, VLAN ID: 6, Protocol: AppleTalk
Any AppleTalk frame received on ports 2 through 8 will be broadcast
to all other ports on Switch 5 associated with the AppleTalk protocol.
For example, if Port 2 received a frame with the AppleTalk protocol,
Switch 5 would only transmit the frame to Ports 2, 3, 4, 6, 7, and 8.
6. Use the VLAN Forwarding Configuration screen to assign Port 1 to
the Yellow VLAN and set the frame type to tagged. With this
configuration, the frames transmitted on Port 1 are tagged as being
from the Yellow VLAN.
If a frame associated with any protocol other than AppleTalk (for
example, for the mail server) is received on any of the Ports 2 through
8, the frame would be part of the Yellow VLAN and transmitted out
Port 1 as a tagged frame to Switch 3 and handled in the same manner
as previously described in the previous examples to route the frame to
the Mail Server on the first floor.
Any unicast frames received via Port 1 that are destined for a device
in the Yellow VLAN are transmitted to the correct device. Any
broadcast frames received via Port 1 are transmitted to all the devices
in the Yellow VLAN and handled in a similar manner as previously
described in Example 2.
802.1Q VLAN User’s Guide
4-21
Chapter 4: Examples
4-22
802.1Q VLAN User’s Guide
INDEX
Numerics
1D Trunk 1-6, 3-16, 4-10
1Q Trunk 1-5, 3-16, 4-4
changing 3-24
Frames
untagged 1-5, 2-4
C
Chapters
organization ix
Configuration 2-2
Conventions x
Hybrid 3-15
D
I
Default VLAN 1-5
to Protocol 4-17
ADD/DEL (Toggle) 3-9
FID - lower part of screen
(Modifiable) 3-9
L
FID - upper part of screen
(Read-Only) 3-9
Forwarding 1-5
VLAN ID - lower part of screen
(Modifiable) 3-9
Local management. See managing the
switch
(Read-Only) 3-9
VLAN Name - lower part of screen
(Modifiable) 3-9
M
Managing the switch 3-1
E
Examples 4-1
F
Filtering Database 1-5
Filtering Database ID 1-4
Forwarding list 1-5
adding entries 3-23
customizing 2-3
O
Organization of chapters ix
Other manuals x
deleting entries 3-23
viewing 3-22
Forwarding mode
802.1Q VLAN User’s Guide
Index-1
Index
part of screen
Ether type (Modifiable) 3-28
P
Port Assignment Configuration screen
FID (Read-Only) 3-15
Port Mode (Selectable) 3-15
Filter All Untagged Frames
(Toggle) 3-19
(Toggle) 3-19
Port # (Selectable) 3-19
VLAN Name (Read-Only) 3-19
Port mode
Related Documents x
the switch
1D Trunk 3-16
1Q Trunk 3-16
changing 3-15
Hybrid 3-15
S
Port VLAN list 1-5
Protocol
802.1Q VLAN Configuration Menu
screen 3-5
Current Ports - upper part of screen
(Read-Only) 3-32
Port Assignment Configuration
DELETE ALL PORTS
(Selectable) 3-32
Port
Protocol VLAN Configuration
(Selectable) 3-32
(Read-Only) 3-32
screen 3-21
Priority (Read-Only) 3-32
Protocol (Read-Only) 3-32
Protocol VLAN Configuration
screen 3-24
Action (Toggle) 3-27
Configured Ports 3-26
Station 2-1
Switch 2-1
T
Tag 1-5
Tag Header 1-5
Tagged frame 1-5, 2-5
Index-2
802.1Q VLAN User’s Guide
Index
U
Untagged frame 1-5, 2-4
V
VLAN
assigning ports 2-2
components 2-1
configuration 2-2
default VLAN 1-5
defining 2-2
definition 1-1 to 1-4
operation 2-3
terms 1-4
types 1-3
VLAN Configuration
deleting 3-12
disabling 3-12
enabling 3-12
screen
Current VLAN Ports
(Read-Only) 3-22
(Read-Only) 3-22
(Toggle) 3-22
Port (Selectable) 3-22
Port Type (Read-Only) 3-22
VLAN ID (Selectable) 3-22
VLAN Name (Read-Only) 3-22
VLAN ID 1-4
assigning 3-16
VLAN Local Management 3-4
VLAN name 1-4
802.1Q VLAN User’s Guide
Index-3
Index
Index-4
802.1Q VLAN User’s Guide
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