System Setup and Software Installation Guide for Cisco NCS 1010, IOS XR Releases

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CDP support on Cisco NCS 1010

Updated: June 17, 2026

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Provides details about CDP support on Cisco NCS 1010, including neighbor discovery behavior, default advertisement timers, and required RPM packages.

Use this reference to review CDP support, discovery behavior, feature history, and RPM package requirements for Cisco NCS 1010.

CDP configuration supports Cisco NCS 1010 setup and management with the following capabilities.

  • Supports the related system setup or management workflow.

  • Defines behavior that affects Cisco NCS 1010 operation.

  • Provides context before you configure or verify the feature.

CDP provides the following discovery behavior on Cisco NCS 1010.

  • CDP is a Cisco proprietary Layer 2 protocol used to obtain information about peer Cisco devices.

  • CDP exchanges packets with neighboring devices to discover their platform type and capabilities.

  • Each CDP-enabled device sends periodic advertisements to a multicast address and advertises at least one address at which it can receive messages.

  • The hold-time information indicates how long a receiving device keeps CDP information before discarding it. The default hold time is 180 seconds.

  • Each device listens to periodic CDP messages every 60 seconds by default to learn about neighboring devices and determine when their interfaces go up or down.

Table 1. Feature History

Feature Name

Release Information

Feature Description

CDP Support

Cisco IOS XR Release 7.10.1

Cisco Discovery Protocol (CDP) support is introduced on NCS 1010. CDP is a Layer 2 network discovery protocol for learning about directly connected Cisco devices. This protocol lets you easily view peer Cisco device information such as IP address, version number, platform type, connected ports, and so on for network planning and troubleshooting.

CDP support is available by installing the following RPMs.

  • xr-cdp-7.10.1.19Iv1.0.0-1.x86_64.rpm

  • xr-cdp-82eb6a4d2fa15d0e-7.10.1.19Iv1.0.0-1.x86_64.rpm

  • xr-cdp-ncs1010-7.10.1.19Iv1.0.0-1.x86_64.rpm

Enable CDP globally

Configure enable CDP globally so that Cisco NCS 1010 uses the required settings for the selected system setup, management, or routing workflow.

To enable CDP globally, use the following commands:

Before you begin

Follow these steps to enable CDP globally:

Procedure

1.

Run the configure command to enter configuration mode.
2.

Run the cdp command to enable CDP.
3.

Run the commit command to save the configuration changes.

The system completes the enable CDP globally task.

Disable CDP globally

Configure disable CDP globally so that Cisco NCS 1010 uses the required settings for the selected system setup, management, or routing workflow.

To disable CDP globally, use the following commands:

Before you begin

Follow these steps to disable CDP globally:

Procedure

1.

Run the configure command to enter configuration mode.
2.

Run the no cdp command to disable CDP.
3.

Run the commit command to save the configuration changes.

The system completes the disable CDP globally task.

Enable CDP on interfaces

Configure enable CDP on interfaces so that Cisco NCS 1010 uses the required settings for the selected system setup, management, or routing workflow.

To enable CDP on the management interface, use the following commands:

To enable CDP on the Gigabit Ethernet (GE) interface, use the following commands:

interface mgmtEth rack/slot/instance/port

The following example enables CDP on the management interface.

interface gigabitEthernet rack/slot/instance/port

The following example enables CDP on the Gigabit Ethernet (GE) interface.

Before you begin

Follow these steps to enable CDP on interfaces:

Procedure

1.

Run the configure command to enter configuration mode.
2.

Run the cdp command to enable CDP.
3.

Run the commit command to save the configuration changes.
4.

Run the configure command to complete this action.

Example:


RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#interface mgmtEth 0/RP0/CPU0/1
RP/0/RP0/CPU0:ios(config-if)#cdp
RP/0/RP0/CPU0:ios(config-if)#commit
5.

Run the configure command to enter configuration mode.
6.

Run the cdp command to enable CDP.
7.

Run the commit command to save the configuration changes.
8.

Run the configure command to complete this action.

Example:


RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#interface gigabitEthernet 0/0/0/0
RP/0/RP0/CPU0:ios(config-if)#cdp
RP/0/RP0/CPU0:ios(config-if)#commit

The system completes the enable CDP on interfaces task.

Modify CDP default settings

Configure modify CDP default settings so that Cisco NCS 1010 uses the required settings for the selected system setup, management, or routing workflow.

Use this task to modify CDP parameters such as the default version, holdtime, and timer.

Before you begin

Follow these steps to modify CDP default settings:

Procedure

1.

Run the configure command to enters global configuration mode.

Example:

RP/0/RP0/CPU0:ios#configure

Enters global configuration mode.
2.

Run the cdp advertise v1 command to configures CDP to use only version 1 (CDPv1) in communicating with neighboring devices. By default, when CDP is enabled, the device sends CDPv2 packets. CDP also sends and receives CDPv1 packets if the device with which CDP is interacting does not process CDPv2 packets. In this example, the device is configured to send and receive only CDPv1 packets. To disable CDP v1, use the no cdp advertise v1 form of this command.

Example:

RP/0/RP0/CPU0:ios(config)#cdp advertise v1

Configures CDP to use only version 1 (CDPv1) in communicating with neighboring devices.

By default, when CDP is enabled, the device sends CDPv2 packets. CDP also sends and receives CDPv1 packets if the device with which CDP is interacting does not process CDPv2 packets.

In this example, the device is configured to send and receive only CDPv1 packets.

To disable CDP v1, use the no cdp advertise v1 form of this command.
3.

Run the cdp holdtime seconds command to specifies the amount of time that the receiving device holds a CDP packet sent from another device before discarding it. By default, when CDP is enabled, the receiving device holds a CDP packet for 180 seconds before discarding it. The range of holdtime parameter is 10 to 255 seconds. The CDP hold time must be set to a higher number of seconds than the time between CDP transmissions, which is set with the cdp timer command.

Example:

RP/0/RP0/CPU0:ios(config)#cdp holdtime 120

Specifies the amount of time that the receiving device holds a CDP packet sent from another device before discarding it.

By default, when CDP is enabled, the receiving device holds a CDP packet for 180 seconds before discarding it. The range of holdtime parameter is 10 to 255 seconds.

Note

The CDP hold time must be set to a higher number of seconds than the time between CDP transmissions, which is set with the cdp timer command.
4.

Run the cdp timer seconds command to specifies the frequency at which CDP update packets are sent. By default, when CDP is enabled, CDP update packets are sent at a frequency of once every 60 seconds. The range of timer parameter is 5 to 254 seconds. A lower timer setting causes CDP update packets to be sent more frequently.

Example:

RP/0/RP0/CPU0:ios(config)#cdp timer 65

Specifies the frequency at which CDP update packets are sent.

By default, when CDP is enabled, CDP update packets are sent at a frequency of once every 60 seconds. The range of timer parameter is 5 to 254 seconds.

Note

A lower timer setting causes CDP update packets to be sent more frequently.
5.

Run the commit command to saves the configuration changes and remains within the configuration session.

Example:

RP/0/RP0/CPU0:ios(config)#commit

Saves the configuration changes and remains within the configuration session.

The system completes the modify CDP default settings task.

Monitor CDP

Configure monitor CDP so that Cisco NCS 1010 uses the required settings for the selected system setup, management, or routing workflow.

Use the show cdp entry entry-name command to display information about a specific neighboring device or all the neighboring devices discovered using CDP.

Use the show cdp interface [interface-name] command to display information about the interfaces on which CDP is enabled.

Before you begin

Follow these steps to monitor CDP:

Procedure

1.

Run the Use the show cdp command to display global CDP information. command to complete this action.
2.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp
Tue Feb 14 16:59:38.255 UTC
Global CDP information:
        Sending CDP packets every 60 seconds
        Sending a holdtime value of 180 seconds
        Sending CDPv2 advertisements is enabled
3.

Run the Use the show cdp neighbors command to display detailed information about neighboring devices discovered using CDP. command to complete this action.
4.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp neighbors mgmtEth 0/RP0/CPU0/1 
Mon Apr 10 12:30:30.902 UTC
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
R1              Mg0/RP0/CPU0/1   172     R          NCS1010   Mg0/RP0/CPU0/1  
RP/0/RP0/CPU0:R2#show cdp neighbors 
Mon Apr 10 12:30:39.251 UTC
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
R1              Mg0/RP0/CPU0/1   164     R          NCS1010   Mg0/RP0/CPU0/1
5.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp neighbors mgmtEth 0/RP0/CPU0/1 detail 
Mon Apr 10 12:31:23.622 UTC

-------------------------
Device ID: R1
SysName : R1
Entry address(es): 
  IPv4 address: 192.168.0.2
  IPv6 address: 2000:110::1
Platform: cisco NCS1010,  Capabilities: Router 
Interface: MgmtEth0/RP0/CPU0/1
Port ID (outgoing port): MgmtEth0/RP0/CPU0/1
Holdtime : 120 sec

Version :
7.10.1.19I

advertisement version: 2
Duplex: full
6.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp entry R1
Mon Apr 10 12:22:22.564 UTC

-------------------------
Device ID: R1
SysName : R1
Entry address(es): 
  IPv4 address: 192.168.0.2
  IPv6 address: 2000:110::1
Platform: cisco NCS1010,  Capabilities: Router 
Interface: MgmtEth0/RP0/CPU0/1
Port ID (outgoing port): MgmtEth0/RP0/CPU0/1
Holdtime : 121 sec

Version :
7.10.1.19I

advertisement version: 2
Duplex: full
7.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp entry *                 
Mon Apr 10 12:24:59.927 UTC

-------------------------
Device ID: R1
SysName : R1
Entry address(es): 
  IPv4 address: 192.168.0.2
  IPv6 address: 2000:110::1
Platform: cisco NCS1010,  Capabilities: Router 
Interface: MgmtEth0/RP0/CPU0/1
Port ID (outgoing port): MgmtEth0/RP0/CPU0/1
Holdtime : 143 sec

Version :
7.10.1.19I

advertisement version: 2
Duplex: full
8.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp interface Mg0/RP0/CPU0/1
Mon Apr 10 12:24:27.253 UTC
MgmtEth0/RP0/CPU0/1 is Up
  Encapsulation ether
  Sending CDP packets every 60 seconds
  Holdtime is 180 seconds
9.

Run the Use the show cdp traffic command to display information about the traffic gathered between devices using CDP. command to complete this action.
10.

Run the required command to complete this action.

Example:


RP/0/RP0/CPU0:ios#show cdp traffic 
Mon Apr 10 12:32:09.247 UTC

CDP counters :
        Packets output: 11, Input: 5
        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: 11, Input: 5
        Unrecognize Hdr version: 0, File open failed: 0

The system completes the monitor CDP task.