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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Overview of IPv4 Multicast Route Management

Overview of IPv4 Multicast Route Management

Definition

Multicast route management refers to the control of multicast packet forwarding by creating or changing multicast routes, as well as checking and maintaining multicast forwarding paths.

Purpose

Multicast route management ensures that multicast packets are forwarded efficiently through the correct paths.

In multicast routing and forwarding, each multicast routing protocol creates and maintains its own routing table. The routing information from these tables is then used to create a general multicast routing table. Multicast routers use this general multicast routing table to determine optimal routes, according to multicast routing and forwarding policies. The optimal route information is then delivered to the multicast forwarding information base (MFIB), where multicast data forwarding is controlled.

The MFIBs of network devices maintain a point-to-multipoint forwarding tree for the entire network, with a multicast source as the root and group members as leaves. Table 7-1 describes functions of multicast route management.

Table 7-1 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 the load on individual paths.

Multicast nonstop routing (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.

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Updated: 2019-04-20

Document ID: EDOC1100075361

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