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3: CDP

Configuring VLAN and CDP on a GW Series Router
Issue 1.4

Page 12 of 12

Command line tracing also allows you to trace to a log file for examining events over a
protracted period of time.

If you enter no event severity, all event severities are displayed.

If you choose an event severity, all events of the chosen severity and greater are
displayed.

To stop tracing, entering – (minus) followed by the event class will stop tracing for this
event class. Entering – (minus) on its own will stop all tracing.

Syntax

Description

++cdp

Starts tracing CDP events

-cdp

Stops CDP tracing

Table 6: The command line tracing syntax and their descriptions

Show cdp server info

CDP Server info
Enabled: yes
Voice VLAN id: 100
Broadcast interval: 60
Time to live: 180

Table 7: Output from the CLI command show cdp server info

Содержание GW Series

Страница 1: ...Configuring VLAN and CDP on a GW Series Router Issue 1 4 Date 10 May 2012 ...

Страница 2: ... respective owners Virtual Access is an ISO 9001 certified company Configuring VLAN and CDP on a GW Series Router Issue 1 4 Page 2 of 12 1 About this document 3 1 1 Scope 3 1 2 Readership 3 1 3 Terminology 3 2 Introduction 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...

Страница 3: ... 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 ...

Страница 4: ...e 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 telepho...

Страница 5: ...s 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 longe...

Страница 6: ...ion Description Minimum value 0 Default value 0 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 i...

Страница 7: ...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 s...

Страница 8: ...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 ...

Страница 9: ...VLAN and CDP on a GW Series Router Issue 1 4 Page 9 of 12 2012 Virtual Access 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 ...

Страница 10: ...rectly 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...

Страница 11: ...le 5 The CDP server fields descriptions and their command lines The critical setting is number Voice VLAN Id This specifies the VLAN tag to offer as part of the CDP broadcast Any host acting as a CDP client will use this tag 3 2 CDP flows The table below describers the flow and mapping between CDP and DHCP Figure 8 Flow and mapping between CDP and DHCP 3 3 Debugging CDP 3 3 1 Tracing using the com...

Страница 12: ...ity all events of the chosen severity and greater are displayed To stop tracing entering minus followed by the event class will stop tracing for this event class Entering minus on its own will stop all tracing Syntax Description cdp Starts tracing CDP events cdp Stops CDP tracing Table 6 The command line tracing syntax and their descriptions Show cdp server info CDP Server info Enabled yes Voice V...

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