[c-nsp] strange multicast behavior on 6509

[Tim Stevenson]

These are most likely "source-only" entries, special entries we use to 
prevent flooding in the source vlan when there are no receivers in that 
vlan. They are purged periodically, but you can disable that using set igmp 
flooding disable. This is in 8.x code and should also be in 7.6.

Tim

At 08:26 AM 4/27/2005, Christian Malo submitted:
>Every 5 mins (exactly) I get:
>
>2005 Apr 27 11:20:02 %MCAST-6-DELGDA:Deleting a GDA 01-00-5e-1c-63-02 in 
>vlan 991
>2005 Apr 27 11:20:02 %MCAST-6-DELGDA:Deleting a GDA 01-00-5e-1c-63-03 in 
>vlan 991
>2005 Apr 27 11:20:02 %MCAST-6-DELGDA:Deleting a GDA 01-00-5e-1c-63-05 in 
>vlan 991
>
>
>There's actually more than that (1 per mcast group).
>
>Vlan 991 is where the streaming sources are. So everytime it does it, the
>6509 starts sending all the mcast traffic to every port in that vlan
>(including trunks) for a short period of time.
>
>Since it's acting like IGMP snooping wasn't working during this short
>period of time, I'm wondering what can be done.
>
>
>I'm currently running catos 7.6.9 with igmp v3 enabled.
>
>
>thanks
>
>
>-chris
>_______________________________________________
>cisco-nsp mailing list  cisco-nsp at puck.nether.net
>https://puck.nether.net/mailman/listinfo/cisco-nsp
>archive at http://puck.nether.net/pipermail/cisco-nsp/



Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.