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Cisco Wireless LAN Controller Configuration Guide
OL-13826-01
Chapter 4 Configuring Controller SettingsWireless Device Access
Configuring Multicast Mode
Note The config network broadcast {enable | disable} command allows you to enable or disable
broadcasting without enabling or disabling multicasting as well. This command uses the
multicast mode currently on the controller to operate.
Step 2 Perform one of the following:
a. To configure the controller to use the unicast method to send multicast packets, enter this command:
config network multicast mode unicast
b. To configure the controller to use the multicast method to send multicast packets to an LWAPP
multicast group, enter this command:
config network multicast mode multicast multicast_group_ip_address
Step 3 To enable or disable IGMP snooping, enter this command:
config network multicast igmp snooping {enable | disable}
The default value is disabled.
Step 4 To set the IGMP timeout value, enter this command:
config network multicast igmp timeout timeout
You can enter a timeout value between 30 and 300 seconds. The controller sends three queries in one
timeout value at an interval of timeout/3 to see if any clients exist for a particular multicast group. If the
controller does not receive a response through an IGMP report from the client, the controller times out
the client entry from the MGID table. When no clients are left for a particular multicast group, the
controller waits for the IGMP timeout value to expire and then deletes the MGID entry from the
controller. The controller always generates a general IGMP query (that is, to destination address
224.0.0.1) and sends it on all WLANs with an MGID value of 1.
Step 5 To save your changes, enter this command:
save config
Using the CLI to View Multicast Groups
Use these commands to view multicast groups using the controller CLI.
To see all the multicast groups and their corresponding MGIDs, enter this command:
show network multicast mgid summary
Information similar to the following appears:
Layer2 MGID Mapping:
-------------------
InterfaceName vlanId MGID
-------------------------------- ------ ----
management 0 0
test 0 9
wired 20 8
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