Virtual access GW Series Merkblatt

Configuring VLAN and CDP on a

GW Series Router

Issue

1.4

Date

10 May 2012

Table of contents

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company.

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 2 of 12

1About this document ............................................................................... 3

1.1 Scope ..................................................................................................... 3

1.2 Readership ............................................................................................. 3

1.3 Terminology ........................................................................................... 3

2Introduction to VLAN............................................................................... 4

2.1 Configuring the router for VLAN ............................................................. 4

2.2 Configuring an individual interface for VLAN .......................................... 5

2.3 Viewing VLAN tags ................................................................................. 6

2.4 Deployment scenario example ............................................................... 7

2.5 Debugging VLAN .................................................................................... 8

3CDP ....................................................................................................... 10

3.1 Configuring the router for CDP ............................................................. 10

3.2 CDP flows ............................................................................................. 11

3.3 Debugging CDP .................................................................................... 11

3.3.1 Tracing using the command line ..............................................................11

1: About this document

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 3 of 12

1About this document

1.1 Scope

This configuration guide explains:

how to set up and configure VLAN and CDP on a GW Series router; and

the basic functionality of VLAN and CDP on a GW Series router.

1.2 Readership

This document is for engineers who have previous experience configuring and managing

Virtual Access routers.

1.3 Terminology

CDP

Cisco Discovery Protocol

QoS

Quality of Service

VLAN

Virtual Local Area Network

VoIP

Voice over Internet Protocol

2: Introduction to VLAN

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 4 of 12

2Introduction to VLAN

Virtual Access routers support 802.1Q tagged-based VLAN. Tagging is the process of

adding a 4 byte tag containing the VID (VLAN ID) to an Ethernet frame.

Hosts send traffic with or without a VLAN tag. The Virtual Access router assigns this

traffic to a particular Ethernet port based on the 802.1Q tag.

VLANs can be used to group hosts together as if they exist physically on the same wire or

alternatively, hosts that are already physically on the same wire can be logically

separated.

VLANs are used to allow different logical networks to be connected to the same physical

hardware without any cross-leakage of data from one VLAN to any other at layer 2.

For cross-communication between the VLANs, you need a router to route at the layer 3

level. The VLANs can be thought of as layer 2 broadcast domains.

The IEEE 802.1Q Ethernet frame is shown in figure 1. The VLAN ID specifies to which

VLAN the Ethernet traffic belongs. This feature can be used to define a fixed voice VLAN,

so that all VoIP telephones can be kept on a dedicated VLAN, with a higher layer

switching at routers or switches.

Figure 1: IEEE 802.1Q Ethernet tag

VLAN tagging is useful when VoIP telephones are used on internal networks. The QoS

feature can be used to prevent timing-critical services, such as voice, from being

interrupted by other less timing-sensitive services, such as data transmission.

As a security feature, the SMG allows the connection of different VLANs to different

physical interfaces on the SMG, with only the inter-VLAN traffic being passed to the

CPU/router. The allowed VLAN tags are configured on the router and any tagged traffic

that does not belong to the allowed VLAN tags group will not be allowed.

2.1 Configuring the router for VLAN

The Virtual Access router has a 4 port Ethernet switch. This switch can be grouped as a

complete segment or as individual segments.

2: Introduction to VLAN

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 5 of 12

To configure a global setting, from the Start page, click Advanced -> Expert view ->

system -> Ethernet -> system. The System page appears.

Figure 2: The Ethernet system page

Field name

Description

Command Line

VLAN Enabled

Configures Ethernet switch for

VLAN tagging.

Option

Description

yes

Enables VLAN

Disables VLAN

Set Ethernet vlan tags

enabled

Media Sense Enabled

Media Sense shows whether or

not changes in the Ethernet

physical state are reflected in

the routing table. If disabled,

the ports will always stay up at

the IP level regardless of

whether the physical cable is

plugged or unplugged.

Set Ethernet media

sense enabled

Table 1: The Ethernet system fields and their descriptions

Note: when you have enabled the Ethernet switch for VLAN tagging, the Ethernet switch

is no longer a segmented LAN and it defaults to a logical interface based on the assigned

VLAN tags.

2.2 Configuring an individual interface for VLAN

To configure an interface setting, from the Start page, click Advanced -> Expert View

-> interface -> eth-x -> vlan interface. The Ethernet Interface page appears.

2: Introduction to VLAN

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 6 of 12

Figure 3: The Ethernet interface VLAN page

Field name

Description

Command Line

VLAN Tag

Defines the VLAN tag ID for a

logical interface.

Option

Description

Minimum

value

Default

value

Maximum

value

65535

Units

Unspecified

Set the Ethernet interface

VLAN tag to eth-x, y where x is

the interface and y is the VLAN

tag.

Set Ethernet interface

vlan tag

Table 2: The VLAN tag field, description and command line

2.3 Viewing VLAN tags

When you have enabled VLAN tagging, to view your tags, from the Expert View Menu,

click operations -> performances -> interface stats -> VLAN table. The VLAN Info

page appears.

2: Introduction to VLAN

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 7 of 12

Figure 4: The VLAN information page showing Ethernet VLAN mapping

Alternatively, you can use a Telnet session to issue the following command:

Show Ethernet vmap

VLAN Tag Logical If

-------- ----------

0 Eth-0

100 Eth-1

200 Eth-2

300 Eth-3

Port Neg S100 Fulldpx Loopbk Pwrdown Isolate Quality Loop?

---- --- ---- ------- ------ ------- ------- ------- -----

A 1 0 0 0 0 0 0 No

B 1 0 0 0 0 0 0 No

C 1 0 0 0 0 0 0 No

D 1 0 0 0 0 0 0 No

Table 3: Screen grab showing results of the show Ethernet vmap command

2.4 Deployment scenario example

The use of VLANs in a VoIP scenario is very important. You can use VLANs to optimise

QoS control and to reduce the number of Ethernet cables used.

You can tag Voice traffic from the LAN to allow the router to apply the appropriate QoS

settings.

When PCs and IP phones exist on separate VLANs, you can use a single Ethernet cable to

daisy chain the PC from the back of the IP phone to reduce cable runs or the number of

Ethernet ports used.

2: Introduction to VLAN

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 8 of 12

Figure 5: An example of a deployment scenario

Command Line

Set Ethernet interface vlan tag = eth-0,0

Set Ethernet interface vlan tag =eth-1,100

Set Ethernet VLAN tags enabled = yes

Table 4: Command lines used for the deployment scenario

2.5 Debugging VLAN

To view the Ethernet switch information, in the Expert View menu, click operations ->

performance -> interface stats -> ethernet switch. The Statistics for Ethernet

Switch page appears.

2: Introduction to VLAN

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 9 of 12

Figure 6: The statistics for Ethernet switch page

Alternatively, you can use a Telnet session to issue the following commands:

Show switch info

Show switch table

3: CDP

Configuring VLAN and CDP on a GW Series Router

Issue 1.4 Page 10 of 12

3CDP

The CDP feature on the router allows it to pass out CDP MAC address broadcasts. This

broadcast can indicate to a client host what VLAN tag to use. Certain IP handsets are

enabled as CDP clients by default.

This means that IP phones that are required to operate on a specific VLAN do not have to

be pre-staged. In conjunction with Virtual Access’ phone provisioning service, IP phones

and routers can be shipped directly to a customer site requiring no pre-configuration.

3.1 Configuring the router for CDP

To configure the router for CDP, from the Start page, click Advanced -> Expert View -

> system ->Ethernet -> CDP server. The CDP Server page appears.

Figure 7: The CDP server page

Field name

Description

Command Line

Enabled

Enables or disables CDP (Cisco

Discovery Protocol) for

advertising Voice VLAN ID.

Option

Description

yes

Enables CDP

Disables CDP

Set CDP server enabled

=yes

Voice VLAN Id

Defines Voice VLAN Identifier

to be advertised.

Option

Description

Minimum

value

Default

value

Maximum

value

65535

Units

Unspecified

Set CDP server voice

vlan identifier = 100

Time to Live

Defines Time to Live for CDP

Set cdp server time to

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