Switch 7700 Configuration Guide

124 CHAPTER 6: MULTICAST PROTOCOL
multicast group. This prevents the hosts of members of other multicast groups
from sending response messages.
■ Max response time
The Max Response Time is added in IGMP Version 2. It is used to dynamically
adjust the allowed maximum time for a host to response to the membership
query message.
IGMP Configuration Once multicast is enabled, IGMP will automatically run on each interface.
Generally, IGMP does not need to be configured. In the following configuration,
only the first one is mandatory.
IGMP configuration includes:
■ Enabling multicast
■ Configuring a router to be a member of a group
■ Controlling the access to IP multicast groups
■ Configuring the IGMP query message interval
■ Selecting the IGMP version
■ Configuring the IGMP querier present timer
■ Configuring the maximum query response time
Enabling Multicast
After multicast is enabled, IGMP will automatically run on all interfaces.
For details, refer to “Common Multicast Configuration ”.
Configuring a Router to be a Member of a Group
Usually, the host operating IGMP will respond to IGMP query packet of the
multicast router. In case of response failure, the multicast router will consider that
there is no multicast member on this network segment and will cancel the
corresponding path. Configuring one interface of the router as multicast member
can avoid such problem. When the interface receives IGMP query packet, the
router will respond, ensuring that the network segment is connected and can
receive multicast packets.
Perform the following configuration in VLAN interface view.
By default, a router joins no multicast group.
Tab le 13 Configure a Router to Be a Member of a Group
Operation Command
Configure a router to be a
member of a group
igmp host-join group-address
Cancel the configuration that
a router is a member of a
group
undo igmp host-join group-address