On 9 Feb 2011, at 17:51, Phil Mayers <[email protected]> wrote:
> On 09/02/11 16:57, Sam Stickland wrote: >> All, >> >> I encountered some strange, but beneficial, behaviour in the lab. We >> connected a server with teamed NICs to two 6500s running SXH2a. The >> NIC teaming is active/standby using only a single MAC and IP address. >> The server joins a multicast group and starts receiving traffic. We >> found that if we pull the primary NIC everything, including the >> multicast traffic, fails over to the standby NIC, losing a couple of >> packets at most. >> >> The strange thing is that packet captures don't show the server >> re-issuing the IGMP join or sending any membership reports on the >> standby NIC. In the past this would had resulted in a loss of >> multicast traffic until the IGMP state is rebuilt on the new switch >> port. But no longer. > > Interesting. Have you tried monitoring a "debug ip igmp" and friends whilst > this happens? > No, not yet. I'll have to see if we still have all the equipment in the lab. I found this behaviour late last year but it's only now I have the time to follow it up. San _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
