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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 13

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to Multicast Route Management (IPv4)

Introduction to Multicast Route Management (IPv4)

This section describes the definition and purpose of multicast route management (IPv4).


The multicast route management function helps control multicast packet forwarding by creating or changing multicast routes, and to check and maintain multicast forwarding paths.


Multicast routing and forwarding is similar to unicast routing and forwarding. Each multicast routing protocol creates and maintains a routing table, and routing information of various multicast routing protocols is summarized into a general multicast routing table. A multicast router selects optimal multicast routes from the multicast routing table according to the multicast routing and forwarding policies, and then delivers the optimal routes to the multicast forwarding table to control multicast data forwarding.

Multicast forwarding tables of network devices maintain a point-to-multipoint forwarding tree on the entire network, with a multicast source as the root and group members as leaves. Table 8-81 lists the multicast route management functions that allow you to create and maintain multicast forwarding paths.

Table 8-81 Multicast route management functions
Function Description

Reverse Path Forwarding (RPF) check

Ensures that multicast data is forwarded through correct paths.

Multicast static route

Changes or connects multicast RPF routes.

Multicast load splitting

Distributes multicast data to multiple equal-cost routes to reduce loads on a single path.

Multicast NSR

Applies to a system with double main control units. The multicast protocol control planes on the main control units work in active/standby mode to ensure highly reliable multicast data forwarding.

Updated: 2019-12-13

Document ID: EDOC1000041694

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