Controlling The Access To Ip Multicast Group; Configuring Igmp Query Interval; Configuring Igmp Version - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
By default, a router does not join any multicast group.

3.2.5 Controlling the Access to IP Multicast Group

Multicast router determines the group membership of a network by received IGMP
response messages. A filter can be set on each interface through access control to limit
the multicast group range the interface serves.
Perform the following configuration in interface view.
Table 3-4 Controlling the access to IP multicast group
Limit the multicast group range of the
interface serves
Cancel the filter configured on the
interface
By default, no filter is configured on the interface, which then permits any multicast
group.

3.2.6 Configuring IGMP Query Interval

The router finds out which multicast groups on its connected network segment have
members by sending IGMP query messages periodically. Upon the reception of a
response message, the router refreshes the membership information of the
corresponding multicast group. The timeout time of the membership query message is
3 times that of the query interval.
Perform the following configuration in interface view.
Table 3-5 Configure query interval
Configure query interval
Restore the default value of query interval
When there are multiple multicast routers on a network segment, the querier is
responsible to send IGMP query messages to all the hosts on the LAN.
By default, the interval is 60 seconds.

3.2.7 Configuring IGMP Version

Perform the following configuration in interface view.
Operation
Operation
3Com Corporation
3-6
Chapter 3 IGMP Configuration
Command
igmp group-policy acl-number [ 1 | 2 ]
undo igmp group-policy
Command
igmp timer query seconds
undo igmp timer query