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Configuring IGMP 121
By default, a router does not join a multicast group.
Limiting Access to IP Multicast Groups
A multicast router learns whether there are members of a multicast group on the
network when it receives an IGMP membership message. A filter can be set on an
interface to limit the range of allowed multicast groups.
Perform the following configuration in VLAN-interface view.
By default, no filters are configured. All multicast groups are allowed on the
interface.
Configuring the IGMP Query Message Interval
Multicast routers send IGMP query messages to find present multicast groups on
other networks. Multicast routers send query messages periodically to refresh their
information of members present.
Perform the following configuration in VLAN 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.
The default interval is 60 seconds.
Cancel a router’s membership of a multicast
group (VLAN interface group)
undo igmp host-join group-address
port { interface_type
interface_num | interface_name } [ to {
interface_type interface_num |
interface_name } ]
Configure a router to be a member of a
multicast group (Ethernet interface view)
igmp host-join group-address vlan
vlanid
Cancel a router’s membership of a multicast
group (Ethernet interface group)
undo igmp host-join group-address
vlan vlanid
Table 127 Limit the Access to IP Multicast Groups
Operation Command
Limit the range of allowed multicast groups
on current interface
igmp group-policy acl-number [ 1 |
2 ]
Remove the filter set on the interface undo igmp group-policy
Limit the range of allowed multicast groups
on current interface (Ethernet port view)
igmp group policy acl-number vlan
vlanid
Remove the filter set on the interface
(Ethernet port view)
undo igmp group policy vlan
vlanid
Table 128 Configure the IGMP Query Message Interval
Operation Command
Configure the IGMP query message interval igmp timer query seconds
Restore the IGMP query message interval to
the default value
undo igmp timer query
Table 126 Configure a Router to Be a Member of a Group
Operation Command