Help on multicast on WLC through ASA

[janesh_abey]

Hi all,

In this setup we have allocated separate VRFs for WLC management (VRF Green) and  AP management(VRF RED).Pls see attached.

Only implemented VRF-lite for the time being but end game is to enable LDP.

If both WLC & AP mangement subnets were in the same VRF multicast should wotk without any issues.

At this stage multicast is only needed to facilitate MOH and VRF-lite is implemented with the aim of enabling LDP.

My questions are:

1. Will multicast work without a hitch between APs and WLC if we have a ASA in the middle?

2. What are the potential issues we need to be aware of if having a ASA in the middle?

Thanks in advance for any thoughts.

cheers,

Janesh 

[Stephen Rodriguez · Accepted solution]

Janesh,

     From what I can find in the below link, it looks like it should work so long as you enable multicast routing on the ASA so that it can forward the multicast messages.

http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/route_multicast.html#wp1104600

when you enable multicast routing it's going to enable pim and igmp on all interfaces.  you'll want to go in and disable this on the interfaces it's not needed on.

HTH,

Steve

[janesh_abey]

Hi Steve,

Many thanks for the link and the caveats on enabling igmp on the ASA.

Do we need the ASA to be a member of the group as well?

cheers,

Janesh

[Stephen Rodriguez]

I wouldn't think it would be necessary, unless the ASA needed to participate in the group.  So long as it will forward the requests it should be fine.

Steve

[janesh_abey]

Hi Steve,

Cool.Thanks very much.

cheers,

Janesh