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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 3 Multicast CAC

Introduction to Layer 3 Multicast CAC


Layer 3 multicast Call Admission Control (CAC) controls learning of Protocol Independent Multicast (PIM) routing entries based on configured rules to limit the number of all multicast groups or the number of multicast groups within a channel.

A channel (an IP TV channel) contains multiple multicast groups (programs).


With the increasing popularity of IPTV, the number of channels is increasing fast. When users request too many programs, multicast aggregation devices are overloaded, and therefore user experience degrades.

Layer 3 multicast CAC addresses this problem by implementing access control on Layer 3 multicast aggregation devices and rejecting user requests for new programs when the network bandwidth is insufficient. The purpose of Layer 3 multicast CAC is to ensure service quality for most of users by sacrificing the satisfaction of a few users.

Updated: 2019-08-21

Document ID: EDOC1000141903

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