4000 Router Series IP Multicast Configuration Guide

{ TO_IN—The filtering mode has changed from Exclude to Include.

{ TO_EX—The filtering mode has changed from Include to Exclude.

{ ALLOW—The Source Address fields in this group record contain a list of the additional sources

from which the system wants to obtain data for packets sent to the specified multicast address.

If the change was to an Include source list, these sources are the addresses that were added to

the list. If the change was to an Exclude source list, these sources are the addresses that were

deleted from the list.

{ BLOCK—The Source Address fields in this group record contain a list of the sources from which

the system no longer wants to obtain data for packets sent to the specified multicast address. If

the change was to an Include source list, these sources are the addresses that were deleted from

the list. If the change was to an Exclude source list, these sources are the addresses that were

added to the list.

IGMP support for VPNs

IGMP maintains group memberships on a per-interface base. After receiving an IGMP message on an

interface, IGMP processes the packet within the VPN to which the interface belongs. IGMP only

communicates with other multicast protocols within the same VPN instance.

Protocols and standards

• RFC 1112, Host Extensions for IP Multicasting

• RFC 2236, Internet Group Management Protocol, Version 2

• RFC 3376, Internet Group Management Protocol, Version 3

IGMP configuration task list

Task at a

lance

Configuring basic IGMP functions

• (Required.) Enabling IGMP

• (Optional.) Specifying the IGMP version

• (Optional.) Configuring an interface as a static member interface

• (Optional.) Configuring a multicast group filter

Adjusting IGMP performance

(Optional.) Enabling IGMP fast-leave processing

Configuring basic IGMP functions

Before you configure basic IGMP functions, complete the following tasks:

• Configure any unicast routing protocol so that all devices are interoperable at the network layer.

• Configure PIM.

• Determine the IGMP version.