System Management Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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System Management Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

Monitor CDP

Updated: September 11, 2026

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Use this procedure to monitor Cisco Discovery Protocol (CDP) neighbor and interface information using show commands.

Monitor the neighboring devices and the CDP-enabled interfaces on your network.

Use these commands to view information about CDP-related devices, interfaces, neighbors, and traffic.

Procedure

  1. View details about specific or all neighboring devices.

    Example:

    Router#show cdp entry
-------------------------
Device ID: chiba
SysName : chiba
Entry address(es): 
Platform: cisco 8000,  Capabilities: Router 
Interface: TenGigE0/2/0/19
Port ID (outgoing port): TenGigE0/0/0/2/0
Holdtime : 171 sec

Version :
26.2.1.19I

advertisement version: 2
Duplex: full

  2. Display information about the interfaces on which CDP is enabled.

    Example:

    Router#show cdp interface
Tue Jan 20 17:57:15.108 EST
TenGigE0/2/0/19 is Up
  Encapsulation ether
  Sending CDP packets every 10 seconds
  Holdtime is 180 seconds

  3. View information about all neighboring devices.

    Example:

    Router# show cdp neighbors
Tue Jan 20 17:58:36.451 EST
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater

Device ID       Local Intrfce    Holdtme Capability Platform  Port ID
chiba           Te0/2/0/19       172     R          8000      Te0/0/0/2/0

  4. Display CDP traffic statistics.

    Example:

    Router#show cdp traffic
CDP counters :
        Packets output: 61, Input: 58
        Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
        No memory: 0, Invalid packet: 0, Truncated: 0
        CDP version 1 advertisements output: 0, Input: 0
        CDP version 2 advertisements output: 61, Input: 58
        Unrecognize Hdr version: 0, File open failed: 0