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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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(Optional) Configuring a Switch-MDT

(Optional) Configuring a Switch-MDT


In a multicast domain (MD) VPN, a share-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. A switch-MDT optimizes MDT and 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 pressure 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 system-view

    The system view is displayed.

  2. Run ip vpn-instance vpn-instance-name

    The VPN instance view is displayed.

  3. Run ipv4-family

    The IPv4 address family is enabled for the VPN instance, and the VPN instance IPv4 address family view is displayed.

  4. Run multicast-domain switch-group-pool switch-group-pool { network-mask | network-mask-length } non-revertive [ acl { advanced-acl-number | acl-name } ]

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

    • switch-group-pool indicates a start address of the Switch-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.

    • non-revertive: Disables the function of switching traffic from a switch-MDT back to a share-MDT. If this parameter is set, after the forwarding rate of a multicast data flow exceeds the switchover threshold, the flow is switched from a share-MDT to a switch-MDT; however, the flow will not be switched back to the share-MDT. To enable the switchback from a switch-MDT to a share-MDT, run the undo multicast-domain switch-group-pool command. The switchover threshold is fixed at 0.

    • { advanced-acl-number | acl-name } indicates an advanced ACL.

  5. (Optional) Run multicast-domain switch-delay switch-delay

    A delay for switching to the switch-MDT is configured.

    By default, the delay is 5 seconds.

  6. (Optional) Run multicast-domain holddown-time interval

    The delay for switching back VPN multicast traffic from the switch-MDT to the share-MDT is set.

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

  7. (Optional) Run multicast-domain switch-without-register

    The source PE is disabled from sending Register packets to the Rendezvous Point (RP) to establish the shortest path tree (SPT) on the public network before the Switch-Group address is used to encapsulate VPN data.

    By default, before the Switch-Group address is used to encapsulate VPN data, the source PE sends Register packets to the RP to establish the SPT on the public network.

  8. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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