Multicast between wirless clients on same AP and Mobility Group

Unanswered Question
May 9th, 2008
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We have a autonomous wireless setup with a WLSM and WLSE. I have an issue with where I have 2 wirless clients that need to communicate using a multicast address for an application to work.

The clients can ping each other but the multicast stream is not working between the clients. The SSID is part of a mobility group that sits on a Cat 6509 sup720.

A debug on the sup720 shows the upstream multicast from one of the clients but you see no activity downstream to the other client.

Tunnel multicast stats: -

Tunnel176 is up, line protocol is up

Internet address is

Multicast routing: enabled

Multicast switching: fast

Multicast packets in/out: 2619/0

Multicast boundary: not set

Multicast TTL threshold: 0

Multicast Tagswitching: disabled

Sup 720 Debug: -

May 9 15:15:31: IGMP(0): Send v2 Report for on Tunnel176

May 9 15:15:31: IGMP(0): Received v2 Report on Tunnel176 from for

May 9 15:15:31: IGMP(0): Received Group record for group, mode 2 from for 0 sources

May 9 15:15:31: IGMP(0): Updating EXCLUDE group timer for

May 9 15:15:31: IGMP(0): MRT Add/Update Tunnel176 for (*, by 0

May 9 15:16:15: IP(0): s= (Tunnel176) d= id=11765, prot=17, len=68(54), mroute olist null

May 9 15:16:15: IP(0): s= (Tunnel176) d= id=11766, prot=17, len=68(54), mroute olist null

May 9 15:16:25: IGMP(0): Send v2 general Query on Tunnel176

May 9 15:16:25: IGMP(0): Set report delay time to 0.9 seconds for on Tunnel176

Please help as I need to get the 2 clients communicating using the multicast stream.



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ericgarnel Tue, 05/13/2008 - 07:38
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Are you able to change the multicast address?

I saw a similar issue with the bonjour app for macs, I changed the address to instead of a 224.x.x.x address and that fixed it.

martin.chapman44 Tue, 05/13/2008 - 11:23
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I'm unable to change the address used as it's encoded in the application and is installed on highly secured unit that has no administration account.

It's a hardware PC that is used for car diagnostics.

gnijs Fri, 01/30/2009 - 07:24
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Have you enabled multicast mode on the controller ?

If so, in what mode ? Unicast or multicast ?

If you selected multicast mode, do you see the controller joining the original stream and sending it to the LWAPP distribution group to the other APs ?


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