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Configuration Guide - IP Multicast

S7700 and S9700 V200R013C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, IPv4 PIM, IPv6 PIM, MSDP, multicast VPN, layer 3 multicast CAC, IPv4 multicast route management, IPv6 multicast route management, IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, layer 2 multicast CAC, multicast network management.
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Overview of Layer 3 Multicast CAC

Overview of 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: 2019-04-08

Document ID: EDOC1100065742

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