11-20-2008 10:02 AM - edited 03-06-2019 02:36 AM
When igmp snooping is applied the interface that sends multicast packets out the job fails after a few minutes. If IGMP is turned off the job passes but multicast hammers the entire network so i need it working. Any suggestions.
11-20-2008 10:59 AM
Is CGMP an available option?
11-20-2008 11:06 AM
yes, i was looking into that but not sure if that is the missing piece.
11-20-2008 11:14 AM
Hello Shane,
IGMP snooping works by sniffing IGMP reports from receivers that are sent if there is a multicast router sending IGMP queries every 60 seconds.
If no multicast router is on the Vlan you can activate a feature called IGMP Snooping querier on the C6500 itself.
see
Hope to help
Giuseppe
11-20-2008 11:30 AM
what about cgmp, could this be the missing link. IGMP querier still fails.
11-20-2008 11:33 AM
CGMP requires a L3 interface to inform the switch to map ports to multicast addresses.
Are you running PIM on a L3 interface at all or is this just multicast within a L2 vlan only.
What IOS are you running ?
Jon
11-20-2008 11:39 AM
My 6509 is running as a l2 switch
(s72033_rp-IPSERVICESK9-VM), Version 12.2(18)SXF10
11-20-2008 11:51 AM
When you have IGMP snooping enabled on your 6500 are you saying it works in that it only sends the multicast stream to those ports that are interested in it. I appreciate that it stops working but the key part is does it actually work for those first 3 minutes or so ?
If the switch is L2 only where is the L3 vlan interface for the L2 vlan on the 6500 ?
Jon
11-20-2008 11:52 AM
the job starts and then crashes and i have 2 7206's on the inside also.
11-20-2008 11:55 AM
Okay the job starts then crashes but in your original thread you said if you turn off IGMP snooping then the network gets hammered. So can i assume from this that before the job crashes the network is not getting hammered.
Where is the L3 interface for the L2 vlan on the 6500 ?
Jon
11-20-2008 11:57 AM
when igmp is on the multicast job only goes where needed and crashes after a few minutes, when off the job completes but my entire network gets hammered with multicast. the 6509 hits my 7206 then out to the WAN. the 7206 is l3.
11-20-2008 12:03 PM
Okay so before the job crashes and you have IGMP snooping turned on, what is doing the IGMP querying ?. As noted by Giuseppe you either have "IGMP snooping querier" enabled or you have a PIM enabled interface.
You could try enabling PIM only on the L3 interface for that vlan on the 7206.
I have checked the bug tool for IGMP bugs related to your IOS but nothing matches what you are seeing.
Jon
11-20-2008 12:11 PM
ip pim-sm is on the lan interface of the 7206 does it need to be on teh wan side also?
11-20-2008 12:12 PM
No, only on the LAN side if you are simply trying to contain the multicast within your L2 vlan.
Jon
11-20-2008 12:13 PM
ok, i'm going to try cgmp and see what happens.
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