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CLI-based Configuration Guide - IP Multicast

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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(Optional) Configuring a Switch-MDT

(Optional) Configuring a Switch-MDT

A Switch-multicast distribution tree (Switch-MDT) is set up for VPN multicast traffic flowing to the public network. Multicast packets can be switched from the Share-MDT to the Switch-MDT. This reduces the stress on PEs and bandwidth consumption, and allows multicast data to be transmitted on demand.


In MD VPN, an MDT is set up between PEs. All PEs that belong to the same MD receive multicast packets, irrespective of whether they have receivers connected to them. This wastes bandwidth resources and imposes an extra burden on PEs. The Switch-MDT is an optimization of the MDT. It allows on-demand multicast transmission. Traffic will be switched from the Share-MDT to the Switch-MDT if multicast traffic on PEs reaches the maximum. Only the PEs that have receivers connected to them will receive multicast data from the Switch-MDT. This reduces the stress on PEs and bandwidth consumption.


If you do not configure a Switch-MDT, VPN multicast data will always be transmitted along the Share-MDT.


  1. Run:


    The system view is displayed.

  2. Run:

    ip vpn-instance vpn-instance-name

    The VPN instance view is displayed.

  3. Run:


    The VPN instance IPv4 address family is enabled and its view is displayed.

  4. Run:

    multicast-domain switch-group-pool switch-group-pool { network-mask |network-mask-length } [ threshold threshold-value | acl { advanced-acl-number | acl-name } ] *

    The switching group pool of a Switch-MDT and conditions for Switch-MDT switching are configured.

    • switch-group-pool: indicates the switching group pool. The same switch-group-pool value must be configured for the same VPN instance IPv4 address family on different PEs. The value range of the Switch-Group address for a VPN instance IPv4 address family cannot overlap with that for another VPN instance IPv4 address family on the same PE.

    • threshold-value: indicates the switching threshold. By default, the switching threshold is 0 kbit/s.

    • { advanced-acl-number | acl-name }: indicates an advanced ACL. By default, packets are not filtered.

  5. (Optional) Run:

    multicast-domain switch-delay switch-delay

    A delay in switching to the Switch-MDT is configured.

    By default, the delay is 5 seconds.

  6. (Optional) Run:

    multicast-domain holddown-time interval

    The time for keeping the rate of VPN multicast data lower than the threshold before data switchback from the Switch-MDT to the Share-MDT is set.

    By default, the delay for switching back VPN multicast traffic from the Share-MDT to the Switch-MDT is 60 seconds.

  7. (Optional) Run:

    multicast-domain switch-without-register

    disables the source PE from sending null Register messages to the rendezvous point (RP) to establish the shortest path tree (SPT) on the public network before encapsulating the Switch-Group address to VPN data. After this command is configured, the Switch-Group switchover on the public network is established as defined in RFC.

    By default, the source PE sends null Register messages to the RP to establish the SPT on the public network before encapsulating the Switch-Group address to VPN data.

Updated: 2019-06-12

Document ID: EDOC1000097181

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