Changing The Query Response Time; Changing The Igmp Version; Configuring Stub Multicast Routing - Cisco 7604 Configuration Manual

Chapter 9 Configuring Multicast Routing
hostname(config-if)# igmp query-interval seconds
If the FWSM does not hear a query message on an interface for the specified timeout value (by default,
255 seconds), then the FWSM becomes the designated router and starts sending the query messages. To
change this timeout value, enter the following command:
hostname(config-if)# igmp query-timeout seconds
Note The igmp query-timeout and igmp query-interval commands require IGMP Version 2.

Changing the Query Response Time

By default, the maximum query response time advertised in IGMP queries is 10 seconds. If the FWSM
does not receive a response to a host query within this amount of time, it deletes the group.
To change the maximum query response time, enter the following command:
hostname(config-if)# igmp query-max-response-time seconds

Changing the IGMP Version

By default, the FWSM runs IGMP Version 2, which enables several additional features such as the igmp
query-timeout and igmp query-interval commands.
All multicast routers on a subnet must support the same version of IGMP. The FWSM does not
automatically detect version 1 routers and switch to version 1. However, a mix of IGMP Version 1 and
2 hosts on the subnet works; the FWSM running IGMP Version 2 works correctly when IGMP Version
1 hosts are present.
To control which version of IGMP is running on an interface, enter the following command:
hostname(config-if)# igmp version {1 | 2}

Configuring Stub Multicast Routing

An FWSM acting as the gateway to the stub area does not need to participate in PIM. Instead, you can
configure it to act as an IGMP proxy agent and forward IGMP messages from hosts connected on one
interface to an upstream multicast router on another. To configure the FWSM as an IGMP proxy agent,
forward the host join and leave messages from the stub area interface to an upstream interface.
To forward the host join and leave messages, enter the following command from the interface attached
to the stub area:
hostname(config-if)# igmp forward interface if_name
Stub Multicast Routing and PIM are not supported concurrently.
Note
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
OL-20748-01
Configuring Stub Multicast Routing
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