On router R2, under BGP neighbor summary: neighbor "192.168.12.1," the UP/down status is Idle (admin), meaning the neighbor relationship has been administratively shut down (no BGP routing information will be exchanged with this neighbor.)
To activate this neighbor:
R2(config)# router bgp 65002
R2(config-router)# neighbor 192.168.12.1 activate
R2# clear ip bgp *
idle(shutdown) → just ignores the peer, add to that "neighbor <ip> activate" command is issued under the specific address-family configuration, not under global BGP router process
The no neighbor <IP> activate command removes the BGP neighbor from the specified address-family and effectively disables route exchange for that family. However, the Idle (Admin) state indicates that the BGP session has been administratively shut down. To bring the session back up, the correct action is to re-enable it using the no shutdown command under the BGP neighbor configuration.
https://community.cisco.com/t5/routing/danger-bgp-command-quot-no-neighbor-activate-quot-removes/td-p/2234433#:~:text=%22no%20neighbor%20activate%22%20was%20used%20to%20disable%20a%20peer%20under%20an%20address%2Dfamily%20instead%20of%20the%20command%20%22neighbor%20shutdown%22.%20The%20result%20is%20that%20the%20BGP%20config%20for%20the%20neighbor%20was%20removed.
A. for sure;
cisco(config-router)#
cisco(config-router)#do s bgp summ
BGP router identifier 10.0.0.1, local AS number 777
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
77.7.7.7 4 555 0 0 1 0 0 never Idle (Admin)
cisco(config-router)#do s runn | sec bgp
router bgp 777
bgp log-neighbor-changes
neighbor 77.7.7.7 remote-as 555
neighbor 77.7.7.7 shutdown
cisco(config-router)#
cisco(config-router)#
cisco(config-router)#no neighbor 77.7.7.7 shutdown
cisco(config-router)#do s bgp summ
BGP router identifier 10.0.0.1, local AS number 777
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
77.7.7.7 4 555 0 0 1 0 0 never Idle
cisco(config-router)#
Because if you look at the show ip bgp summary output on R2, it clearly shows neighbor 192.168.12.1 is admin down. That means under R2 BGP process, neighbor 192.168.12.1 has been shut down.
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