Hello everybody, Yesterday we did a network wide upgrade on our 7600 routers from SRB4 to SRC4. After the upgrade we were hit pretty hard by one of the weirdest 7600 behaviours ever.
Between a pair of 7600 routers, let's say R1 and R2 (both with SUP720-3BXL and 6704-10GE with DFC3BXL or DFC3CXL line-cards) we have 5 10GE links configured for IGP equal-cost load-balancing (the IGP being OSPF in our case). After about 3-4 hours from the upgrade R1 started shutting down one of it's interfaces from the 5 10GE interfaces group, the bringing it back up (it was the Te11/1 interface). When I say shutting down I mean that in the logs appeared "changed state to administratively down" and in the running-configuration the "shutdown" command appeared under that interface and after a couple of seconds the "shutdown" command disappeared. I am 100% sure that no person was issuing any commands on R1 (we have even disabled SNMP just to make sure). We use a mixture of Cisco and non-Cisco optical modules so first we tried exchanging the XENPAKs with new/original ones and replacing the fiber optic patches. Then we tried moving the configuration to a new port (Te10/1, on a different line-card) and the problem persisted. After a couple hours the situation deteriorated with overruns on some interfaces and packet loss for traffic transiting R1. After we have rebooted module 10 (so the second line-card with the problem, not the first one) the problem cleared. We have opened a TAC case and we are waiting for some feedback, in the mean time has anyone else encountered this behaviour ? The only thing I could find is CSCsv17989 (interface in SIP200 show "admin down" when it is physical down) but according to the bug description that is only a cosmetic problem. Best regards, -- Andrei "2+2=5, for extremely large values of 2 !" _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/