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Configuring the Cisco Discovery Protocol (CDP) with ESX Server

Details

Introduced with ESX 3.5, is the ability to use the Cisco Discovery Protocol (CDP). The article describes configuring the ESX host and provides an example configuration of a physical switch.

Solution

To Configure the ESX 3.5 host:
 
  1. Log in as root to the Service Console (via SSH, remote console, or physical console).

  2. Verify the current CDP setting for the desired virtual switch (vSwitch1, in this example).

    [root@server root]# esxcfg-vswitch -b vSwitch1
    down

    The output of down indicates CDP is currently not implemented

  3. Set the CDP status for a given virtual switch. Possible values here are down, listen, advertise, or both.

    [root@server root]#  esxcfg-vswitch -B both vSwitch1

  4. Verify the new setting:

    [root@server root]# esxcfg-vswitch -b vSwitch1
    both
The following is an example of configuring CDP for a Cisco 6500 physical switch:
  1. switch#
  2. switch# config terminal
  3. switch(config)# cdp run
  4. switch(config)# interface g1/1
  5. switch(config-if)# cdp enable
  6. switch# show cdp neighbors

         Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                         S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
         Device ID                        Local Intrfce   Holdtme   Capability  Platform         Port ID
    pa-tse-h24.pasl.vmware.com Gig   1/1             121       S           VMware ESXvmnic2
         pa-tse-h24.pasl.vmware.com Gig   1/2             121       S           VMware ESXvmnic3

Keywords

Cisco Discovery Protocol,CDP

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Actions
  • KB Article: 1003885
  • Updated: Aug 14, 2009
  • Products:
    VMware ESX
  • Product Versions:
    VMware ESX 3.5.x