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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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Principles

Principles

Layer 3 Multicast CAC Deployment

Layer 3 multicast CAC can be deployed on an IPv4 network running Protocol Independent Multicast Sparse Mode (PIM-SM). When the number of multicast groups that users have joined reaches the CAC limit value configured on a switch, the switch no longer generates PIM routing entries for new multicast groups. This function ensures that multicast traffic received by the switch does not exceed its forwarding capability, and also controls downlink bandwidth usage.

In the example shown in Figure 8-1, user hosts connect to a PIM network through SwitchC (a Layer 3 multicast aggregation switch) to obtain multicast services provided by the Internet content providers (ICPs). To control link bandwidth usage and multicast traffic received on SwitchC, you can configure Layer 3 multicast CAC on SwitchC in either of the following ways:

  • Solution 1: Create different VLANIF interfaces for ICP1, ICP2, and ICP3, and set different limits on the number of multicast groups (Max. Program Count shown in Figure 8-1) on the VLANIF interfaces based on the bandwidth leased to the ICPs. When the number of programs requested by users in a VLAN reaches the configured limit, users cannot watch new programs provided by the corresponding ICP.
  • Solution 2: Create multiple channels and set different limits on the number of multicast groups for the channels. For example, you can create three channels: basic, silver, and gold. Add programs to the three channels based on their popularity, and set different limits on the number of multicast groups for the channels. When the number of programs in a channel requested by users reaches the configured limit, users cannot watch new programs in the channel.
Figure 8-1  Layer 3 multicast CAC

Figure 8-1 shows two typical solutions, which can be used together on a network. For example, you can set the maximum number of multicast groups on VLANIF 20 (created or ICP2) to 400, and then set different limits on the number of multicast groups for channels basic, silver, and gold on VLANIF 20.

Implementation

  • Limiting the number of all multicast groups

    Layer 3 multicast CAC can limit the number of all multicast groups on a switch or an interface. In the any-source multicast (ASM) model, the CAC counter value increases by 1 for each group G, regardless of how many (*, G) or (S, G) entries have been created for this group. In the source-specific multicast (SSM) model, the CAC counter value increases by 1 every time an (S, G) entry is created. If the counter value is within the configured limit, the switch can create new multicast routing entries. If the counter value reaches the limit, the switch does not create multicast routing entries. The CAC counter value decreases when multicast routing entries are deleted.

  • Limiting the number of multicast groups in a channel

    Each channel has a group address range. Layer 3 multicast CAC controls the number of groups in each channel separately. The number of multicast groups in a channel can also be controlled globally or on an interface. The CAC limit at each level applies only to the corresponding channel.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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