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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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Introduction to Layer 2 Multicast CAC

Introduction to Layer 2 Multicast CAC


Layer 2 multicast Call Admission Control (CAC) limits the number of all multicast groups or the number of multicast groups in a channel by controlling learning of Layer 2 multicast forwarding entries.

A channel contains multiple multicast groups. A channel represents a TV station (XXTV for example), and a multicast group represents a program provided by a TV station.


As IPTV services become more and more popular, the number of channels and programs is increasing rapidly. When users request many programs, multicast aggregation devices are overloaded, and therefore user experience degrades.

Layer 2 multicast CAC addresses this problem by implementing access control on Layer 2 multicast aggregation device. When network bandwidth is insufficient, users cannot join new multicast groups. This ensures the service quality for most of users by sacrificing satisfaction of a few users.

Updated: 2019-08-21

Document ID: EDOC1000141903

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