Changing BGP router-id

[johnlloyd_13]

hi,

i'll be changing an ISP/BGP peer. my question is, do i negate first the old bgp router-id or just directly configure/apply the new router-id?

do i need to do a "clear ip bgp" to establish the new ISP/BGP peer?

router bgp 65123
 neighbor 63.21.16.4 shutdown   <<< OLD ISP/BGP PEER
 no bgp router-id 63.21.16.4
 bgp router-id 63.22.11.18

[MHM Cisco World]

when you change the router-id the bgp is down and then UP again and use new router-id

MHM

[johnlloyd_13]

hi,

you just added a new BGP router id.

my question is, how do you change the existing router id to a new one using a new BGP peer?

do you overwrite it or negate first the current config with a "no router-id x.x.x.x"?

will it bounce or do i need to issue a "clear ip bgp *"?

[MHM Cisco World]

To clear point here 

1- the all bgp have one router-id' there us no router-id per peer

2- when you add new router-id the old one automatically remove' and bgp use new one

MHM