[c-nsp] need an idea -- router's all TCP sessions STUCK
Kinczli Zoltán
Zoltan.Kinczli at Synergon.hu
Sun Nov 28 13:48:10 EST 2004
Hello,
i'd need an idea here...
A router (c72k w NPE-G1, 12.3(6a)) runs OSPF, and MP-BGP, it's an MPLS/VPN PE.
Roughly in each 2,5-3 hours all of its TCP sessions (LDP and BGP) get stucked: hold timer exp, nbr down.
Strange:
all OSPF neighbors are up and happy
router can only ping neighbors via serial interfaces
there are ATM uplinks, and serial 'downlink' to other/further PEs and CEs
router can not initiate TCP sessions via the 'pingable' serial I/Fs, ... nor via the others
A clear ip route * solves the issue!
all of the following together won't solve the issue though:
- shut/no shut on I/Fs with routing sources behind them (ospf neighbors),
- clear ip ospf proc
- clear adj
- clear tcp tcb *
- clear ip bg ne *
what's the difference between the clear ip route * and them?
there is plenty of contniuous free mem available... just before all of you ask:
router#sh mem summ
Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)
Processor 62C7A200 456678912 28742624 427936288 425854868 425109588
I/O E000000 33554432 9864712 23689720 22977192 23398272
other info:
in deb ip tcp trans there are lots of:
>> Nov 27 22:19:18.587 CET: TCP: Alert! Received a broadcast packet from x.y.z.o
from different sources, not our address space
thanks for any idea
-zoltan
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