On Thu, 29 Jul 2010 08:29:18 -0400, you wrote: > I have seen some pretty low level problems with multicast packets > being dropped on the floor by the hardware forwarded on 67xx > linecards. The bug seems to appear when changes that effect the asic > (turning on "mls qos" for example). Resetting the sup engine doesn't > resolve it. Everything looks good at the CEF/mfib level, and all > counters show the packet count increasing, but the packets never get > forwarded out of the linecard.
Sounds a bit like CSCtc24959, which I saw with a couple of customers. It was typically seen on changes to topology (i.e. rerouting). Flipping the replication mode: mls ip multicast replication-mode ingress no mls ip multicast replication-mode ingress [1] causes reprogramming of the hardware, which fixed the problem without having to reset the whole blade. Note that it *is* traffic-affecting for all active multicast flows. CSCtc24959 is fixed in SRD4 and will not be integrated in earlier releases, or so I was told. HTH, -A [1] Or the other way round if you use ingress replication _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
