R3303-HP HSR6800 Routers IP Multicast Configuration Guide

{ IS_EX—The source filtering mode is Exclude. The report sender requests the multicast data from

any sources but those defined in the specified multicast source list.

{ 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

that the system wants to obtain data from, 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 that the

system no longer wants to obtain data from, 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 SSM mapping

The IGMP SSM mapping feature enables you to configure static IGMP SSM mappings on the last-hop

router to provide SSM support for receiver hosts that are running IGMPv1 or IGMPv2. The SSM model

assumes that the last-hop router has identified the desired multicast sources when receivers join multicast

groups.

• When a host that is running IGMPv3 joins a multicast group, it can explicitly specify one or more

multicast sources in its IGMPv3 report.

• A host that is running IGMPv1 or IGMPv2, however, cannot specify multicast source addresses in its

report. In this case, you must configure the IGMP SSM mapping feature to translate the (*, G)

information in the IGMPv1 or IGMPv2 report into (G, INCLUDE, (S1, S2...)) information.

Figure 27 IGMP SSM mapping

As shown in Figure 27, on an SSM network, Host A, Host B, and Host C run IGMPv1, IGMPv2, and

IGMPv3, respectively. To provide SSM service for all the hosts if IGMPv3 is not available on Host A and

Host B, you must configure the IGMP SSM mapping feature on Router A.