H3C Technologies H3C S7500E Series Switches - Manual (Page 85)

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Multicast Routing and Forwarding Configuration
When configuring multicast routing and forwarding, go to these sections for information you are
interested in:
z Multicast Routing and Forwarding Overview
z Configuration Task List
z Displaying and Maintaining Multicast Routing and Forwarding
z Configuration Examples
z Troubleshooting Multicast Routing and Forwarding
z The term "router" in this document refers to a router in a generic sense or a Layer 3 switch
running an IP routing protocol.
z The S7500E Series Ethernet Switches are distributed devices that support Intelligent
Resilient Framework (IRF). Two S7500E series can be connected together to form a
distributed IRF device. If an S7500E series is not in any IRF, it operates as a distributed
device; if the S7500E series is in an IRF, it operates as a distributed IRF device. For
introduction of IRF, refer to IRF Configuration in the IRF Configuration Guide.
z Only EB cards and SD boards support the application of GRE tunnel in multicast
forwarding.
Multicast Routing and Forwarding Overview
Introduction to Multicast Routing and Forwarding
In multicast implementations, multicast routing and forwarding are implemented by three types
of tables:
z Each multicast routing protocol has its own multicast routing table, such as PIM routing
table.
z The information of different multicast routing protocols forms a general multicast routing
table.
z The multicast forwarding table is directly used to control the forwarding of multicast
packets.
A multicast forwarding table consists of a set of (S, G) entries, each indicating the routing
information for delivering multicast data from a multicast source to a multicast group. If a router
supports multiple multicast protocols, its multicast routing table will include routes generated by
multiple protocols. The router chooses the optimal route from the multicast routing table based