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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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Understanding Layer 2 Multicast CAC

Understanding Layer 2 Multicast CAC

Layer 2 multicast CAC can be deployed on VLANs or virtual private LAN service (VPLS) networks running Internet Group Management Protocol (IGMP) snooping. This section uses a network with multiple VLANs as an example to describe the Layer 2 multicast CAC deployment and implementation.

Layer 2 Multicast CAC Deployment

With Layer 2 multicast CAC configured, a switch will not generate Layer 2 multicast forwarding entries for new requests after the number of groups reaches the configured limit.

Figure 15-1 shows Layer 2 multicast CAC deployment on a network with multiple VLANs. In this example, hosts connect to a Protocol Independent Multicast (PIM) network through SwitchA (a Layer 2 multicast aggregation switch) to obtain multicast services from the Internet content providers (ICPs). Layer 2 multicast CAC can be deployed on SwitchA to control link bandwidth usage on the network. Two deployment solutions are available:
  • Solution 1: Create different VLANs for the ICPs, and set different limits on the number of multicast groups for the VLANs based on the bandwidth leased to each ICP. 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 allowed on those 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 15-1  Layer 2 multicast CAC deployment on a network with multiple VLANs

The two solutions can be used together to flexibly control the number of multicast groups based on service requirements. For example, you can set the maximum number of multicast groups in VLAN 20 (created for ICP2) to 400, and then set different limits on the number of multicast groups for channels basic, silver, and gold in VLAN 20.

Implementation

  • Limiting the total number of multicast groups

    Layer 2 multicast CAC can limit the number of multicast groups at four levels: global, VLAN, interface, and interface+VLAN. Every time the switch creates a multicast group or adds a group member port after receiving an IGMP Report message, the Layer 2 multicast CAC counter at the corresponding level increases by 1. If the counter value is within the configured limit, the switch can create new multicast forwarding entries. If the counter value reaches the limit, the switch does not create multicast forwarding entries after receiving IGMP Report messages. Similarly, the Layer 2 multicast CAC counter decreases by 1 every time the switch deletes an entry after an IGMP Leave message is received or the entry aging time expires.

    In Figure 15-2, VLAN1, VLAN2, and VLAN3 are created on a switch. Interface1 belongs to VLAN1 and VLAN2; Interface2 belongs to VLAN2; Interface3 belongs to VLAN2 and VLAN3. You can set appropriate CAC limits for the VLANs and interfaces. For users in VLAN2, set the maximum number of groups on Interface1 to n2, on Interface2 to n5, and on Interface3 to n3. The maximum number of groups that users in this VLAN can join is greater than or equal to n2+n3+n5.

    Figure 15-2  CAC limits for all multicast groups at different levels
  • Limiting the number of multicast groups in a channel

    Each channel has a group address range. Layer 2 multicast CAC controls the number of groups in each channel separately. The number of multicast groups in a channel is controlled at four levels: global, VLAN, interface, and interface+VLAN. The CAC limit at each level applies only to the corresponding channel.

    In Figure 15-3, a switch has two channels configured, XXTV and YYTV. You can limit the number of groups at the four levels for each channel.

    Figure 15-3  CAC limits for multicast groups in each channel at different levels

Layer 2 Multicast CAC Application on a VPLS Network

Layer 2 multicast CAC can also limit the number of Layer 2 multicast forwarding entries on a VPLS network to control link bandwidth usage. A VPLS network supports CAC limits for all multicast groups or the multicast groups in a channel at three levels: global, virtual switching instance (VSI), and interface, which can be an attachment circuit (AC) side or pseudo wire (PW) side interface.

For example, VSI blue and VSI orange are configured for two enterprises on the VPLS network, as shown in Figure 15-4. Each VSI has a multicast server deployed in a site to send multicast data to all users in the VSI. Layer 2 multicast CAC can be deployed on the VPLS network to control link bandwidth usage. Two deployment solutions are available:
  • Solution 1: Set a global limit on the number of multicast groups on PE3, based on the capacity of PE3.
  • Solution 2: Set different limits on the number of multicast groups in the two VSIs on PE3, based on the bandwidth leased to the enterprises. Alternatively, set different limits on the PW-side interfaces of PE1 and PE2.
  • Solution 3: Set different limits on the number of multicast groups on the AC-side interfaces of PE3, based on the number of programs required by users in the VSIs.
Figure 15-4  Layer 2 multicast CAC deployment on a VPLS network

For details about VPLS implementation and configuration, see VPLS Configuration in the S7700 and S9700 V200R013C00 Configuration Guide - VPN.

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Updated: 2019-04-08

Document ID: EDOC1100065742

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