22 Summit24e3 Switch Quick Reference Guide
IP Multicast Routing Commands
Command Description
clear igmp snooping {vlan <name>} Removes one or all IGMP snooping entries.
clear ipmc cache {<group> {<source>
<netmask>}}
Resets the IP multicast cache table. If no options are specified,
all IP multicast cache entries are flushed.
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.
config igmp snooping <router_timeout>
<host_timeout>
Configures the IGMP snooping timers. Timers should be set to
approximately 2.5 times the router query interval in use on the
network. Specify the following:
■ router_timeout — The interval, in seconds, between the
last time the router was discovered and the current time. The
range is 10 to 2,147,483,647 seconds (68 years). The default
setting is 260 seconds.
■ host_timeout — The interval, in seconds, between the last
IGMP group report message from the host and the current
time. The range is 10 to 2,147,483,647 seconds (68 years).
The default setting is 260 seconds.
config ipmc cache timeout <seconds> Configures the aging time for multicast cache entries. The default
setting is 300 seconds.
disable igmp {vlan <name>} Disables the router-side IGMP processing on a router interface.
No IGMP query is generated, but the switch continues to
respond to IGMP queries received from other devices. If no
VLAN is specified, IGMP is disabled on all router interfaces.
disable igmp snooping Disables IGMP snooping. IGMP snooping can be disabled only if
IP multicast routing is not being used. Disabling IGMP snooping
allows all IGMP and IP multicast traffic to flood within a given
VLAN.
disable ipmcforwarding {vlan <name>} Disables IP multicast forwarding.
enable igmp {vlan <name>} Enables IGMP on a router interface. If no VLAN is specified,
IGMP is enabled on all router interfaces. The default setting is
enabled.
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