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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 2 Multicast CAC Configuration Tasks

Summary of Layer 2 Multicast CAC Configuration Tasks

Layer 2 multicast CAC controls the number of all multicast groups or the multicast groups in a channel at different levels. You can configure Layer 2 multicast CAC limits to flexibly control access of multicast users.

Table 15-1 lists VLAN-based Layer 2 multicast CAC configuration tasks.

Table 15-1  VLAN-based Layer 2 multicast CAC configuration tasks
Task Description

Configuring Layer 2 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 CAC limits for all multicast groups to limit the number of multicast groups in the system, VLAN, interface, or interface+VLAN. CAC limits at different levels apply to the following scenarios:

  • Global limit: applies to scenarios where user interests on multicast programs differ, for example, hotels and schools. In these scenarios, users connected to a switch join many groups, and the heavy multicast traffic may cause network congestion. A global limit can be configured to control the multicast traffic rate on the switch within a proper range.
  • Per VLAN limit: applies to scenarios where users in different VLANs require different multicast programs. In these scenarios, different limits can be configured to control multicast traffic in the VLANs.
  • Per interface limit: applies 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 on the link connected to the interface.
  • Per interface+VLAN limit: applies to scenarios where users connected to an interface belong to different VLANs and require different multicast programs. Different limits can be configured in the VLANs on this interface.

Configuring Layer 2 Multicast CAC for a Channel

CAC configuration on a channel applies only to a specified group address range. You can group programs into different channels and configure different limits to control the number of groups in each channel. This controls multicast services in a smaller granularity. CAC limits at different levels apply to the following scenarios:

  • Global limit: controls the number of multicast groups in a channel based on bandwidth requirements of all user networks connected to a switch.
  • Per VLAN limit: controls the number of multicast groups in a channel based on bandwidth requirements of users in a VLAN.
  • Per interface limit: controls the number of multicast groups in a channel based on bandwidth requirements of users connected to an interface.
  • Per interface+VLAN limit: controls the number of multicast groups in a channel based on bandwidth requirements of users in different VLANs on the same interface.

Table 15-2 lists VSI-based Layer 2 multicast CAC configuration tasks.

Table 15-2  VSI-based Layer 2 multicast CAC configuration tasks
Task Description

Configuring Layer 2 Multicast CAC for All Multicast Groups

If users have joined too many groups, congestion may occur on the VPLS network, causing deterioration of service quality. You can configure Layer 2 multicast CAC for all multicast groups to limit the number of multicast groups in the system, VSI, or interface. CAC limits at different levels apply to the following scenarios:

  • Global limit: applies to scenarios where a provider edge (PE) device connects to sites of multiple VSIs and users in these sites require different multicast programs. In these scenarios, heavy multicast traffic on the PE device may cause network congestion. A global limit can be configured on the PE device to control the multicast traffic within a proper range.
  • Per VSI limit: applies to scenarios where users in different VSIs require different multicast programs. In these scenarios, different limits can be set for the VSIs.
  • Per AC-side interface limit: applies to scenarios where users in a site require different multicast programs. A limit can be configured on the AC-side interface connected to the site to control multicast traffic on the link connected to the AC-side interface.
  • Per PW-side interface limit: applies to scenarios where all multicast sources are deployed in the same site. A limit can be configured on the PW-side interface of the PE device connected to the site to control multicast traffic on the link connected to the PW-side interface.

Configuring Layer 2 Multicast CAC for a Channel

CAC configuration on a channel applies only to a specified group address range. You can group programs into different channels and configure different limits to control the number of groups in each channel. This controls multicast services in a smaller granularity. CAC limits at different levels apply to the following scenarios:

  • Global limit: controls the number of multicast groups in a channel based on bandwidth requirements of all sites connected to a PE device.
  • Per VSI limit: controls the number of multicast groups in a channel based on bandwidth requirements of users in a VSI.
  • Per AC-side interface limit: controls the number of multicast groups in a channel based on bandwidth requirements of users in a site.
  • Per PW-side interface limit: controls the number of multicast groups in a channel based on bandwidth requirements collected from PE devices connected to different sites.

Different Layer 2 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 to control the multicast traffic on a 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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