Hi All, Yesterday we had a strange issue. Our monitoring tool alerted that one of our boxes (SUP720-3BXL - 6506 running SXI3) became unreachable.
When we logged in everything looked ok. BGP was up, OSPF was up and nothing special in logging. Still traffic had dropped to near zero. With "debug ip cef drop" we immediately saw that traffic was dropped due to uRPF feature. All upstream interfaces had strict mode uRPF configured, before the problems started it was loose mode uRPF. After manually changing them back too loose mode traffic was restored. A couple of minutes before the problems started an engineer had configured a customer facing interface with strict mode uRPF. Apparently this configuration changed triggered a bug that caused upstream interface loose mode to be automagically turned to strict mode. So, hereby a heads up. If your SXI3 boxes show strange behavior, quickly check uRPF. Cya, Bas _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
