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Internet Group Management Protocol (IGMP) 331
By default, a router joins no multicast group.
Limiting Multicast Groups An Interface Can Access
A multicast router learns whether there are members of a multicast group on the
network via the received IGMP membership message. A filter can be set on an
interface so as to limit the range of allowed multicast groups.
Perform the following configuration in Interface view.
By default, no filter is configured, that is, all multicast groups are allowed on the
interface.
Configuring the Interval to Send IGMP Query Message
Multicast routers send IGMP query messages to discover which multicast groups are
present on attached networks. Multicast routers send query messages periodically to
refresh their knowledge of members present on their networks.
Perform the following configuration in Interface view.
When there are multiple multicast routers on a network segment, the querier is
responsible for sending IGMP query messages to all hosts on the LAN.
By default, the interval is 60 seconds.
Table 334 Configuring a router to join specified multicast group
Operation Command
Configure a router to join
specified multicast group
(VLAN Interface View)
igmp host-join group_address port { interface_type
interface_ num | interface_name } [ to {
interface_type interface_ num | interface_name } ]
Quit from specified
multicast group (VLAN
Interface View)
undo igmp host-join group-address port {
interface_type interface_ num | interface_name } [
to { interface_type interface_ num |
interface_name } ]
Configure a router to join
specified multicast group
(Ethernet Port View)
igmp host-join group-address vlan vlanid
Quit from specified
multicast group (Ethernet
Port View)
undo igmp host-join group-address vlan vlanid
Table 335 Limiting multicast groups an interface can access
Operation Command
Limit the range of allowed
multicast groups on
current interface (Interface
View)
igmp group-policy acl_number [ 1 | 2 | port {
interface_type interface_ num | interface_name }
[ to { interface_type interface_ num |
interface_name } ] ]
Remove the filter set on
the interface (Interface
View)
undo igmp group-policy [ port { interface_type
interface_ num | interface_name } [ to {
interface_type interface_ num | interface_name }
] ]
Table 336 Configuring the interval to send IGMP query message
Operation Command
Configure the interval to send IGMP query message igmp timer query seconds
Restore the default value undo igmp timer query