LOST TCP SESSION, LDP AND BGP, OVER ONE INTERFACE

[csoto]

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

[Nagendra Kumar Nainar]

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

[csoto]

Hi Nagendra

This router is a PE device on a MPLS network, the adjacency is:

OSPF>>     To P device (Huawei)

               To other PE (Cisco), PE1

BGG>>     To two Router Reflector

LDP>>     To P device (Huawei), other PE1 and several other PE´s

I attach file with output of command "sh int ten3/3" and "show ibc", this output shows a drop counter, but is a long time record

Please your help

Christian

[csoto]

Hi Nagendra

This is output og sh tcp brief

PE2-PCS-RANCAGUA#sh tcp brief

TCB       Local Address               Foreign Address             (state)

4B558124  200.11.98.9.646             200.11.98.37.51654          ESTAB

53336910  200.11.98.9.646             200.111.117.61.49833        ESTAB

4B4CF2A0  200.11.98.9.646             200.111.117.20.64138        ESTAB

536E56A4  200.11.98.9.61369           200.11.96.126.179           ESTAB

53359454  200.11.98.9.22913           200.11.96.81.646            ESTAB

4B6C25EC  200.11.98.9.646             200.111.117.251.53802       ESTAB

537CFBE4  200.11.98.9.62975           200.11.96.125.179           ESTAB

5330A774  200.11.98.9.646             200.111.117.86.62367        ESTAB

4B4D97EC  200.11.98.9.18753           200.11.96.88.646            ESTAB

4B018A28  200.11.98.9.61292           200.11.98.8.646             ESTAB

4B0B176C  200.11.98.9.23              190.151.64.218.36508        ESTAB

4B1976F0  200.11.98.9.17760           190.151.97.92.646           ESTAB

4B261BD0  200.11.98.9.646             200.72.146.42.64641         ESTAB

537CEFF8  200.11.98.9.646             200.111.117.74.54785        ESTAB

531F4890  200.11.98.9.15536           190.151.97.77.646           ESTAB

5359F5B4  200.11.98.9.24658           190.151.97.74.646           ESTAB

PE2-PCS-RANCAGUA#

Christian