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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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Summary of Layer 3 Multicast CAC Configuration Tasks

Summary of Layer 3 Multicast CAC Configuration Tasks

Table 8-1 lists Layer 3 multicast CAC configuration tasks.

Table 8-1  Layer 3 multicast CAC configuration tasks
Task Description

Configuring Layer 3 Multicast CAC for All Multicast Groups

If users have joined too many groups, congestion may occur on the network, causing deterioration of service quality. To ensure sufficient bandwidth for multicast data forwarding, you can configure Layer 3 multicast CAC to limit the total number of multicast groups on a switch or an interface. CAC limits for all groups can be applied at the following levels:

  • Globally: Global limits apply to scenarios where users are interested in many different types of multicast programs, for example, hotels and schools. In these situations, users connected to a switch join many groups. Heavy multicast traffic may cause network congestion. When congestion occurs, some users cannot receive multicast streams. A global limit can be configured to control the total multicast traffic rate on the switch.
  • Per interface: Per interface limits apply to scenarios where users connected to an interface require many different programs. A limit can be configured on this interface to control the multicast traffic rate on the link connected to the interface.

Configuring Layer 3 Multicast CAC for a Channel

CAC limits configured for a channel apply only to a specified group address range. You can group programs into different channels and configure different limits for the channels to control the number of groups in each channel. By doing this, you can control multicast services in a smaller granularity. CAC limits for a channel can be applied at the following levels:

  • Globally: A global limit controls the number of multicast groups in a channel based on bandwidth requirements of all user networks connected to a switch.
  • Per interface: A per interface limit controls the number of multicast groups in a channel based on bandwidth requirements of users connected to an interface.

Different Layer 3 multicast CAC limits can be combined to flexibly control the number of multicast groups. For example, you can configure a global limit for the total number of multicast groups on a switch to control the overall multicast traffic on the switch. Then you can add multicast groups to different channels and set different limits for the channels.

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Updated: 2019-04-08

Document ID: EDOC1100065742

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