Displaying CDP packet information

After enabling CDP packet interception, you can view CDP packet information.

Ensure that CDP has been enabled.

You can display the following CDP information:

  • Cisco neighbors
  • CDP entries for all Cisco neighbors or a specific neighbor
  • CDP packet statistics
Note: The commands used to display CDP information are the same as those used to display FDP information. In the following steps we are only displaying CDP information that a RUCKUS device has intercepted. You will normally see Foundry Discovery Protocol (FDP) information in addition to CDP information.
  1. To display CDP entries for all neighbors, enter the following command: 
    device# show fdp entry *

Device ID: Router
Entry address(es):
  IP address: 10.95.6.143
Platform: cisco RSP4,  Capabilities: Router
Interface: Eth 1/1/2,  Port ID (outgoing port): FastEthernet5/0/0
Holdtime : 124 seconds
Version :
Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-JSV-M), Version 12.0(5)T1,  RELEASE SOFTWARE
(fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Thu 19-Aug-99 04:12 by cmong
  2. To display CDP entries for a specific device, specify the device ID. 
    device# show fdp entry Router1 

Device ID: Router1
Entry address(es):
  IP address: 10.95.6.143
Platform: cisco RSP4,  Capabilities: Router
Interface: Eth 1/1/2,  Port ID (outgoing port): FastEthernet5/0/0
Holdtime : 156 seconds
Version :
Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-JSV-M), Version 12.0(5)T1,  RELEASE SOFTWARE
(fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Thu 19-Aug-99 04:12 by cmong
  3. To display CDP packet statistics, enter the following command: 
    device# show fdp traffic

CDP counters:
  Total packets output: 0, Input: 3
  Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
  No memory: 0, Invalid packet: 0, Fragmented: 0
Parent topic: Cisco Discovery Protocol