Same BGP peer on multiple lines, same AS

[JDChacon74249]

bgp,Hey there,

Under which circumstances will I see multiple lines for same BGP peers/same AS under the show ip bgp all summary?

HOST.A#show ip bgp all summary | include A.B.C.7|Msg
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
A.B.C.7 4 64XXX 0 0 1 0 0 12:47:07 Idle
A.B.C.7 4 64XXX 0 0 1 0 0 12:47:07 Idle
A.B.C.7 4 64XXX 0 0 1 0 0 12:47:07 Active
A.B.C.7 4 64XXX 0 0 1 0 0 12:47:07 Active
A.B.C.7 4 64XXX 2971802 2905868 15775193 0 0 24w4d 662
A.B.C.7 4 64XXX 444299 416641 15775193 0 0 3w3d 1771
HOST.A#

Regards
JD

[Giuseppe Larosa]

Hello JD,

check the BGP configuration on your router to see if you have defined two BGP sessions to the same neighbor in same AS but using a different update-source address.

To be noted you have two established sessions that have the same table version 15775193 but you receive only 662 prefixes on the first one and more prefixes  1771 on the other session like the other side is using route filtering on one session.

>> A.B.C.7 4 64XXX 2971802 2905868 15775193 0 0 24w4d 662
A.B.C.7 4 64XXX 444299 416641 15775193 0 0 3w3d 1771

Hope to help

Giuseppe