Internet Group Management Protocol (IGMP) 181
Specific Group Query
In IGMP Version 1, a query of multicast routers is targeted at all the multicast
groups on the network segment. This is known as General Query.
In addition to General Query, IGMP Version 2 also supports Group-Specific Query.
The destination IP address of the query packet is the IP address of the multicast
group. The group address domain in the packet is also the IP address of the
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 respond to the membership query
message.
Configuring IGMP Basic IGMP configuration includes:
■ Enabling Multicast
■ Enabling IGMP on an Interface
Advanced IGMP configuration includes:
■ Configuring the IGMP Version
■ Configuring the Interval and the Number of IGMP Query Packets
■ Configuring Maximum Response Time for IGMP Query Message
■ Configuring Maximum Response Time for IGMP Query Message
■ Configuring the Limit of IGMP Groups on an Interface
■ Configuring a Router to Join Specified Multicast Group
■ Limiting Multicast Groups An Interface Can Access
■ Configuring the Interval to Send IGMP Query Message
■ Deleting IGMP Groups Joined on an Interface
Enabling Multicast
Refer to “Common Multicast Configuration” on page 177.
Enabling IGMP on an Interface
You must enable multicast before you can execute the igmp enable command.
After this, you can initiate IGMP feature configuration.
Perform the following configuration in Interface View.
By default, IGMP is not enabled.
Tab le 189 Enabling/Disabling IGMP on an interface
Operation Command
Enable IGMP on an interface igmp enable
Disable IGMP on an interface undo igmp enable
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