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Cisco Wireless LAN Controller Configuration Guide
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Chapter 4 Configuring Controller Settings
Configuring the Supervisor 720 to Support the WiSM
•When using Multiple controllers on the network, make sure that the same multicast address is
configured on all the controllers.
•Multicast mode does not work across intersubnet mobility events such as guest tunneling,
site-specific VLANs, or interface override using RADIUS. However, multicast mode does work in
these subnet mobility events when you disable the layer 2 IGMP snooping/CGMP features on the
wired LAN.
•The controller drops any multicast packets sent to the UDP port numbers 12222, 12223, and 12224.
Make sure the multicast applications on your network do not use those port numbers.

Enabling Multicast Mode

Multicasting is disabled by default. Use the commands in Table 4-2 to configure multicast mode on the
controller CLI.
You can also enable multicast mode on the Configure > Switch IP System General page on the WCS
interface.
Configuring the Supervisor 720 to Support the WiSM
When you install a WiSM in a Cisco Catalyst 6500 switch, you must configure the Supervisor 720 to
support the WiSM. When the supervisor detects the WiSM, the supervisor creates 10 GigabitEthernet
interfaces, ranging from Gigslot/1 to Gigslot/8. For example, if the WiSM is in slot 9, the supervisor
creates interfaces Gig9/1 through Gig9/8. The first eight GigabitEthernet interfaces must be organized
into two etherchannel bundles of four interfaces each. The remaining two GigabitEthernet interfaces are
used as service-port interfaces, one for each controller on the WiSM. You must manually create VLANs
to communicate with the ports on the WiSM.
Note The WiSM is also supported on Cisco 7600 Series Routers running only Cisco IOS Release
12.2(18)SXF5.
Table 4-2 CLI Commands for Configuring Multicast Mode
Command Multicast Mode
config network multicast global
{enable | disable}
Enable or disable multicasting
config network multicast mode unicast Configure the controller to use the unicast method
to send multicast packets
config network multicast mode multicast
multicast-group-ip-address
Configure the controller to use the multicast
method to send multicast packets to an LWAPP
multicast group.