3Com 10014298 manual Enabling Igmp on an Interface, By default, Igmp is not enabled

118CHAPTER 6: MULTICAST PROTOCOL

Advanced IGMP configuration includes:

■Configuring the IGMP Version

■Configuring the Interval for Sending the IGMP Group-Specific Query Packet

■Configuring the Interval for Sending IGMP Group-Specific Query Packet

■Configuring the Limit of IGMP Groups on an Interface

■Configuring a Router to be a Member of a Group

■Limiting Access to IP Multicast Groups

■Configuring the IGMP Query Message Interval

■Configuring the IGMP Querier Present Timer

■Configuring the Maximum Query Response Time

■Deleting IGMP Groups Joined on an Interface

■Displaying and Debugging IGMP

Enabling Multicast

After multicast is enabled, IGMP will automatically run on all interfaces.

For details, see “Configuring Common Multicast ” on page 114.

Enabling IGMP on an Interface

You must enable multicast before you can execute the igmp enable command.

After this, you can initiate the IGMP feature configuration.

Perform the following configuration in VLAN interface view.

Table 121 Enable/Disable IGMP on an Interface

Operation	Command
Enable IGMP on an interface	igmp enable
Disable IGMP on an interface	undo igmp enable

By default, IGMP is not enabled.

Configuring the IGMP Version

Perform the following configuration in VLAN interface view.

Table 122 Select the IGMP Version

Operation	Command
Select the IGMP version that the router uses	igmp version { 2 1 }
Restore the default setting	undo igmp version

The default is IGMP Version 2.

All routers on a subnet must support the same version of IGMP. After detecting the presence of IGMP Version 1 system, a router cannot automatically switch to Version 1.