We recently changed an interface IP address, which was being used as router ID. What do we need to do to make the router ID use this new interface IP address?
the BGP router-id is picked up when the BGP process starts.
copy the BGP router config to a notepad.
no router bgp xx
then copy paste the config a new BGP router-id is chosen
I recommend to use bgp router-id to be sure that BGP router-id will be the same over time.
Hope to help
You can reset the BGP process by going into configuration mode, typing a "no router bgp ", exiting the configuration mode and then typing config mem so that BGP config is re-applied. Note that this is obviously intrusive though.