C H A P T E R 9 Configuring Multicast Routing; Enabling Multicast Routing; Configuring Igmp Features - Cisco 7604 Configuration Manual

Enabling Multicast Routing

If the FWSM is the PIM RP, use the untranslated outside address of the FWSM as the RP address.
Note
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
Multicast routing on the FWSM is limited to eight outgoing interfaces.
Note
The number of entries in the multicast routing tables are limited by the amount of RAM on the system.
Table 9-1
on the FWSM. Once these limits are reached, any new entries are discarded.
Table 9-1
Table
MFIB
IGMP Groups
PIM Routes

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:
•
•
•
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
9-2
lists the maximum number of entries for specific multicast tables based on the amount of RAM
Entry Limits for Multicast Tables
16 MB 128 MB 128+ MB
1000 3000
1000 3000
3000 7000
Disabling IGMP on an Interface, page 9-3
Configuring Group Membership, page 9-3
Configuring a Statically Joined Group, page 9-3
5000
5000
12000
Chapter 9 Configuring Multicast Routing
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