bgp router-id

Syntax

bgp router-id <ROUTER-ID>

no bgp router-id <ROUTER-ID>

Description

This command configures a fixed router ID for the BGP Peer process running on the router. Any changes in BGP configuration are applied by restarting the current BGP sessions in the VRFs.

The no form of this command removes the fixed router ID from the running configuration and restores the default router ID selection as follows.

Command context

config-bgp

Parameters

<ROUTER-ID>

Specifies the router ID as an IP address. Any valid unicast IP address can be used (in the format A.B.C.D).

If router-id is changed, then all the active BGP peer sessions will go DOWN and will be restarted with the new configured router-id. A message is displayed, such as: All current BGP sessions in VRF default will be restarted.

Authority

Administrators

Usage

BGP determines the router ID using the following priority:

  1. Use the address configured by the bgp router-id command.

  2. Use the highest IP address among all the loopback interfaces.

  3. Use the highest IP address of any interface.

Examples

switch(config-bgp)# bgp router-id 1.1.1.1
All current BGP sessions in VRF default will be restarted.
Do you want to continue (y/n)?
switch(config-bgp)# no bgp router-id 1.1.1.1
All current BGP sessions in VRF default will be restarted.
Do you want to continue (y/n)?