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{ IS_IN—The source filtering mode is Include. The report sender requests the multicast data from
only the sources defined in the specified multicast source list.
{ IS_EX—The source filtering mode is Exclude. The report sender requests the multicast data from
any sources except 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 contain a list of additional sources from which the receiver
wants to obtain data. If the current filtering mode is Include, these sources are added to the
multicast source list. If the current filtering mode is Exclude, these sources are deleted from the
multicast source list.
{ BLOCK—The Source Address fields contain a list of the sources from which the receiver no
longer wants to obtain data. If the current filtering mode is Include, these sources are deleted
from the multicast source list. If the current filtering mode is Exclude, these sources are added to
the multicast source list.
IGMP SSM mapping
The IGMP SSM mapping feature provides SSM support for receiver hosts that are running IGMPv1 or
IGMPv2. This feature is implemented by configuring static IGMP SSM mappings on the IGMP-enabled
routers.
The SSM model assumes that the IGMP-enabled routers have identified the desired multicast sources
when receivers join multicast groups.
• A host running IGMPv3 can explicitly specify multicast source addresses in its reports.
• A host running IGMPv1 or IGMPv2, however, cannot specify multicast source addresses in its
reports. In this case, you must configure the IGMP SSM mapping feature to translate the (*, G)
information in the IGMPv1 or IGMPv2 reports into (G, INCLUDE, (S1, S2...)) information.
Figure 24 IGMP SSM mapping
As shown in Figure 24, Host A, Host B, and Host C on an SSM network, run IGMPv1, IGMPv2, and
IGMPv3, respectively. To provide the SSM service for Host A and Host B, you must configure the IGMP
SSM mapping feature on Router A.
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