Hi, This is a well known limitation of 6500/7600 platform. You cannot use strict and loose mode at same time. Upon a URPF mode change on a given interface, all interfaces change as well.
-----Mensagem original----- De: [email protected] [mailto:[email protected]] Em nome de bas Enviada em: quinta-feira, 29 de julho de 2010 16:22 Para: Cisco Assunto: [c-nsp] SXI3 strange issue,Loose mode uRPF jumps to strict by itself 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/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
