IGMP Overview
65
the switch is configured to perform IGMP snooping and there is no other
reliable querier on the network.
IGMP configuration commands are described in Ta b le 1 8
.
Table 18
IGMP Configuration Commands
Command Description
enable igmp {vlan <name>}
Enables IGMP. If no VLAN is specified, IGMP is
enabled on all interfaces. The default setting is
enabled.
enable igmp snooping
{forward-mcrouter-only}
Enables IGMP snooping on the switch. If
forward-mcrouter-only
is specified, the
switch forwards all multicast traffic to the
multicast router, only. Otherwise, the switch
forwards all multicast traffic to any IP router.
config igmp <query_interval>
<query_response_interval>
<last_member_query_interval>
Configures the IGMP timers. Timers are based on
RFC2236. Specify the following:
■
query_interval
— The amount of time, in
seconds, the system waits between sending
out General Queries. The range is 1 to
2,147,483,647 seconds (68 years). The default
setting is 125 seconds.
■
query_response_interval
— The
maximum response time inserted into the
periodic General Queries. The range is 1 to 25
seconds. The default setting is 10 seconds.
■
last_member_query_interval
— The
maximum response time inserted into a
Group-Specific Query sent in response to a
Leave group message. The range is 1 to 25
seconds. The default setting is 1 second.
(continued)
