neighbor update-source


     update-source {<IPv4>|<IPv6> | loopback <NUMBER>}

no neighbor {<IP-ADDRESS>|<PEER-GROUP-NAME>} 
     update-source [<IPv4>|<IPv6> | loopback <NUMBER>]


This command specifies the source address to reach the neighbor.

An iBGP connection can occur as long as there is a TCP/IP path between the routers. If multiple paths exist between the iBGP routers, using a loopback interface as the neighbor address can add stability to the network. With this command, stability can be achieved by providing the loopback interface address as the source address of the TCP/IP session.

The no form of this command negates the route updates of the neighbor.

Command context




Specifies an IP address.


Specifies a peer group.


Specifies an interface by IPv4 address.


Specifies an interface by IPv6 address.

loopback <NUMBER>

Specifies a loopback interface number.


Administrators or local user group members with execution rights for this command.


switch(config-bgp)# neighbor update-source loopback 1
switch(config-bgp)# no neighbor update-source
switch(config-bgp)# neighbor PG update-source loopback 1
switch(config-bgp)# no neighbor PG update-source