Operation Manual – MulticastH3C S5500-EI Series Ethernet SwitchesChapter 9 Multicast Routing andForwarding Configuration9-1Chapter 9 Multicast Routing and ForwardingConfigurationWhen configuring multicast routing and forwarding, go to these sections for informationyou are interested in:z Multicast Routing and Forwarding Overviewz Configuring Multicast Routing and Forwardingz Displaying and Maintaining Multicast Routing and Forwardingz Configuration Examplesz Troubleshooting Multicast Routing and ForwardingNote:The term "router" in this document refers to a router in a generic sense or a Layer 3switch running an IP routing protocol.9.1 Multicast Routing and Forwarding Overview9.1.1 Introduction to Multicast Routing and ForwardingIn multicast implementations, multicast routing and forwarding are implemented bythree types of tables:z Each multicast routing protocol has its own multicast routing table, such as PIMrouting table.z The information of different multicast routing protocols forms a general multicastrouting table.z The multicast forwarding table is directly used to control the forwarding ofmulticast packets.A multicast forwarding table consists of a set of (S, G) entries, each indicating therouting information for delivering multicast data from a multicast source to a multicastgroup. If a router supports multiple multicast protocols, its multicast routing table willinclude routes generated by multiple protocols. The router chooses the optimal routefrom the multicast routing table based on the configured multicast routing andforwarding policy and installs the route entry into its multicast forwarding table.
