Enabling Multicast Routing; Configuring Igmp Features - Cisco PIX 500 Series Configuration Manual

Enabling Multicast Routing

Enabling Multicast Routing
Enabling multicast routing lets the security appliance 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
The number of entries in the multicast routing tables are limited by the amount of RAM on the system.
Table 11-1
RAM on the security appliance. Once these limits are reached, any new entries are discarded.
Table 11-1
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 security appliance, IGMP Version 2 is automatically enabled
on all interfaces.
Only the no igmp command appears in the interface configuration when you use the show run
Note
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:
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Cisco Security Appliance Command Line Configuration Guide
11-14
lists the maximum number of entries for specific multicast tables based on the amount of
Entry Limits for Multicast Tables
16 MB 128 MB 128+ MB
1000 3000
1000 3000
3000 7000
Disabling IGMP on an Interface, page 11-15
Configuring Group Membership, page 11-15
Configuring a Statically Joined Group, page 11-15
Controlling Access to Multicast Groups, page 11-15
Limiting the Number of IGMP States on an Interface, page 11-16
Modifying the Query Interval and Query Timeout, page 11-16
Changing the Query Response Time, page 11-17
Changing the IGMP Version, page 11-17
5000
5000
12000
Chapter 11 Configuring Multicast Routing
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