Cisco 7604 Configuration Guide - Page 186
Enabling Multicast Routing, Configuring IGMP Features
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Enabling Multicast Routing Chapter 9 Configuring Multicast Routing Note If the FWSM is the PIM RP, use the untranslated outside address of the FWSM as the RP address. Enabling Multicast Routing Enabling multicast routing lets the FWSM forward multicast packets. Enabling multicast routing automatically enables PIM and IGMP on all interfaces. To enable multicast routing, enter the following command. hostname(config)# multicast-routing Note Multicast routing on the FWSM is limited to eight outgoing interfaces. The number of entries in the multicast routing tables are limited by the amount of RAM on the system. Table 9-1 lists the maximum number of entries for specific multicast tables based on the amount of RAM on the FWSM. Once these limits are reached, any new entries are discarded. Table 9-1 Entry Limits for Multicast Tables Table 16 MB 128 MB 128+ MB MFIB 1000 3000 5000 IGMP Groups 1000 3000 5000 PIM Routes 3000 7000 12000 Configuring IGMP Features IP hosts use IGMP to report their group memberships to directly connected multicast routers. IGMP uses group addresses (Class D IP address) as group identifiers. Host group address can be in the range 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is never assigned to any group. The address 224.0.0.1 is assigned to all systems on a subnet. The address 224.0.0.2 is assigned to all routers on a subnet. When you enable multicast routing on the FWSM, IGMP Version 2 is automatically enabled on all interfaces. Note Only the no igmp command appears in the interface configuration when you use the show run command. If the multicast-routing command appears in the device configuration, then IGMP is automatically enabled on all interfaces. This section describes how to configure optional IGMP setting on a per-interface basis. This section includes the following topics: • Disabling IGMP on an Interface, page 9-3 • Configuring Group Membership, page 9-3 • Configuring a Statically Joined Group, page 9-3 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 9-2 OL-20748-01
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