Cisco 7604 Configuration Guide - Page 187
Disabling IGMP on an Interface, Configuring Group Membership, Configuring a Statically Joined Group
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Chapter 9 Configuring Multicast Routing Configuring IGMP Features • Controlling Access to Multicast Groups, page 9-4 • Limiting the Number of IGMP States on an Interface, page 9-4 • Modifying the Query Interval and Query Timeout, page 9-4 • Changing the Query Response Time, page 9-5 • Changing the IGMP Version, page 9-5 Disabling IGMP on an Interface You can disable IGMP on specific interfaces. This is useful if you know that you do not have any multicast hosts on a specific interface and you want to prevent the FWSM from sending host query messages on that interface. To disable IGMP on an interface, enter the following command: hostname(config-if)# no igmp To reenable IGMP on an interface, enter the following command: hostname(config-if)# igmp Note Only the no igmp command appears in the interface configuration. Configuring Group Membership You can configure the FWSM to be a member of a multicast group. Configuring the FWSM to join a multicast group causes upstream routers to maintain multicast routing table information for that group and keep the paths for that group active. To have the FWSM join a multicast group, enter the following command: hostname(config-if)# igmp join-group group-address Configuring a Statically Joined Group Sometimes a group member cannot report its membership in the group, or there may be no members of a group on the network segment, but you still want multicast traffic for that group to be sent to that network segment. You can have multicast traffic for that group sent to the segment in one of two ways: • Using the igmp join-group command (see Configuring Group Membership, page 9-3). This causes the FWSM to accept and to forward the multicast packets. • Using the igmp static-group command. The FWSM does not accept the multicast packets but rather forwards them to the specified interface. To configure a statically joined multicast group on an interface, enter the following command: hostname(config-if)# igmp static-group group-address OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 9-3
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