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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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Changing a BGP router ID

BGP uses the configured router ID to identify the devices in the network.

By default, the router ID is the highest IP address of the Loopback interface. If no Loopback interfaces are configured, the highest IP address of a physical interface on the router is used as the BGP router ID. To change the default BGP router ID, use the following command.
Change the BGP router ID of a BGP router
ROUTER BGP mode
bgp router-id ip-address
ip-address- IP address in dotted decimal format.
NOTE Do not specify an IP address which is used by another device as a router ID.
Peering sessions are reset when you change the router ID of a BGP router. Upon changing the router ID, the system automatically restarts the BGP instance for the configuration to take effect.

Example of changing BGP router ID

DellEMC# configure terminal
DellEMC(conf)# router bgp 400
DellEMC(conf-router_bgp)# bgp router-id 1.1.1.1

Following is the sample output of show ip bgp ipv4 multicast summary command.

DellEMC# show ip bgp summary
BGP router identifier 1.1.1.1, local AS number 400
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
1 neighbor(s) using 8192 bytes of memory

Neighbor        AS            MsgRcvd  MsgSent     TblVer  InQ  OutQ Up/Down  State/Pfx
20.20.20.1      200                 0        0          0    0     0 00:00:00 0
DellEMC#                                                           

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