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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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Configuring a Multicast Loopback Interface

Configuring a Multicast Loopback Interface

Context

VPN multicast packets are encapsulated into public network multicast data packets using Generic Routing Encapsulation (GRE) before they can be transmitted on a public network. The switch encapsulates VPN packets into public network packets only after a multicast loopback interface is configured. When VPN multicast packets reach a PE, these packets are directed to member interfaces of the multicast loopback interface for encapsulation.

Perform the following steps on a PE.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface eth-trunk trunk-id

    The Eth-Trunk interface view is displayed.

  3. Run:

    service type multicast-tunnel

    The Eth-Trunk interface is configured as a multicast loopback interface.

    • On the PE, only one Eth-Trunk interface can function as the multicast loopback interface. All VPN multicast packets are encapsulated into public network multicast data packets on this interface.
    • An Eth-Trunk interface cannot function as the multicast loopback interface if it has member interfaces or other services configured.
    • Before disabling an Eth-Trunk interface from working as the multicast loopback interface, delete all member interfaces from the Eth-Trunk interface.
    • If an Eth-Trunk interface has multiple member interfaces, it is recommended that you run the unknown-unicast load-balance enhanced command in the system view to configure load balancing among the member interfaces based on source/destination IP addresses in IP headers. If this command is not configured, the Eth-Trunk member interfaces load balance packets based on source/destination IP addresses in GRE headers outside the IP headers. Because multicast packets of a private network are encapsulated with the same GRE header, all multicast packets are forwarded through the same member interface. Load balancing cannot be implemented in this case.
    • If an Eth-Trunk has been configured as a multicast VPN loopback interface, do not use the MIB to perform other service configuration on the Eth-Trunk. If service configuration is performed, the multicast VPN loopback interface will become invalid or the service configuration may not take effect.

  4. Run:

    trunkport interface-type interface-number

    A physical interface is added to the Eth-Trunk interface.

    • A physical interface cannot function as a member interface of the multicast loopback interface if other services have been configured on the physical interface. It is recommended that you use idle interfaces (with no cables connected) as member interfaces.
    • Interfaces in different slots cannot function as member interfaces of the multicast loopback interface simultaneously.
    • Repeat step 4 to configure multiple physical interfaces as member interfaces of the multicast loopback interface.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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