HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 92
IGMP proxying, Configuring PIM,
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• If G is in the SSM group range but no IGMP SSM mappings that correspond to the multicast group G have been configured on Router A, Router A cannot provide SSM service and drops the message. • If G is in the SSM group range and the IGMP SSM mappings have been configured on Router A for multicast group G, Router A translates the (*, G) information in the IGMP report into (G, INCLUDE, (S1, S2...)) information based on the configured IGMP SSM mappings and provides SSM service accordingly. NOTE: The IGMP SSM mapping feature does not process IGMPv3 reports. For more information about the SSM group range, see "Configuring PIM." IGMP proxying In some simple tree-shaped topologies, it is not necessary to configure complex multicast routing protocols, such as PIM, on the boundary devices. Instead, you can configure IGMP proxying on these devices. With IGMP proxying configured, the device serves as a proxy for the downstream hosts to send IGMP messages, maintain group memberships, and implement multicast forwarding based on the memberships. In this case, each boundary device is a host but no longer a PIM neighbor to the upstream device. Figure 32 Network diagram Proxy & Querier Router B Querier Router A PIM domain Ethernet Receiver Host A Host B Query from Router A Report from Router B Query from Router B Receiver Host C Report from Host Host interface Router interface As shown in Figure 32, the following types of interfaces are defined on an IGMP proxy device: • Upstream interface-Also called the "proxy interface". A proxy interface is an interface on which IGMP proxying is configured. It is in the direction toward the root of the multicast forwarding tree. An upstream interface acts as a host that is running IGMP. Therefore, it is also called the "host interface". • Downstream interface-An interface that is running IGMP and is not in the direction toward the root of the multicast forwarding tree. A downstream interface acts as a router that is running IGMP. Therefore, it is also called the "router interface". A device with IGMP proxying configured maintains a group membership database, which stores the group memberships on all the downstream interfaces. Each entry comprises the multicast address, filter 81
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