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LOST TCP SESSION, LDP AND BGP, OVER ONE INTERFACE

csoto
Level 1
Level 1

On 7609 PE router, lost only TCP session attach to one interface (Te3/3). The router shows this log

Aug  4   13:17:31.424: %LDP-5-NBRCHG: LDP Neighbor 200.111.117.251:0 (1) is DOWN   (Session KeepAlive Timer expired)

Aug  4   13:19:52.493: %BGP-5-ADJCHANGE: neighbor 200.11.96.126 Down BGP Notification   sent

Aug  4   13:19:52.493: %BGP-3-NOTIFICATION: sent to neighbor 200.11.96.126 4/0 (hold   time expired) 0 bytes

Aug  4   13:42:11.265: %BGP-5-ADJCHANGE: neighbor 200.11.96.126 Up

Aug  4   13:42:23.549: %LDP-5-NBRCHG: LDP Neighbor 200.111.117.251:0 (1) is UP

The device did not present a interface flap.

The device did not present lost of OSPF adyacency, over the same interface

The device did not present lost of TCP session over oher interfaces

Please help me,

I suspect a bug, but I failed to find

Christian

3 Replies 3

Nagendra Kumar Nainar
Cisco Employee
Cisco Employee

Hi,

It appears that there was control packets loss on incoming direction cuasing BGP hold time to expire and LDP sesion to expire.

BGP neighbor (200.11.96.126) and LDP neighbor (200.111.117.251) are directly connected or multihop away?. Is it the same node to which OSPF adjacency is up?.

Do you see any drops in interface or IBC?. Use "show interface teng3/3" and "show ibc" to check for any drops.

-Nagendra