We are using BGP (MPLS) for all the Branches. Several branches links were down; also we have Backup for all the Branches. When Links were down at the time Backup also not coming UP. Branches were totally isolated. After Restored the links I checked the BGP Status on one of the Branch
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxR
10.xx.xx.xx 4 9829 1494835 173642 4 0 0 1d05h 0
By seeing Summary BGP was Not Fluctuvated.not only this Branch I checked all the Branches which are down .there also BGP was not Flapping. How it's Possible and what could be a reason.