Multicast on WLC


Default Multicast is disabled on a WLC, so we have to enable it and assign a multicast ip address to it.

In this example, the CME streams moh to 239.10.10.10 and we assign the WLC to 239.10.10.11

At the switches, ip igmp snooping must be enabled. (This is a default setting.)
To verify :
show ip igmp snooping
Global IGMP Snooping configuration:
——————————————-
IGMP snooping : Enabled
IGMPv3 snooping (minimal) : Enabled
Report suppression : Enabled
TCN solicit query : Disabled
TCN flood query count : 2
Robustness variable : 2
Last member query count : 2
Last member query interval : 1000

Vlan 1:
——–
IGMP snooping : Enabled
IGMPv2 immediate leave : Disabled
Multicast router learning mode : pim-dvmrp
CGMP interoperability mode : IGMP_ONLY
Robustness variable : 2
Last member query count : 2
Last member query interval : 1000

At the router, which is the CME, we configure sparse or dense mode at the interface.
Make sure that ip multicast-routing is configured.

If everything is setup and we’re going to verify the config at the WLC we’ll see :

Now I’m going to setup a call with moh. We’ll see :

You can verify it also at the router with :
sh ip mroute

About Joost van der Made

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