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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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Configuring IPv6 Multicast Load Splitting

Configuring IPv6 Multicast Load Splitting

Pre-configuration Tasks

Before configuring IPv6 multicast load splitting, complete the following tasks:

  • Configure an IPv6 unicast routing protocol to ensure normal unicast routing on the IPv6 network.
  • Globally enable Layer 3 IPv6 multicast routing (using the multicast ipv6 routing-enable command in the system view).


By default, if there are multiple equal-cost routes to a multicast source, the device selects the route with the highest next-hop address as the RPF route. After multicast load splitting is configured, the device uses the specified load splitting policy to distribute multicast data among multiple paths. This function improves quality of multicast forwarding.


  1. Run system-view

    The system view is displayed.

  2. Run multicast ipv6 load-splitting { balance-ucmp | group | source | source-group | stable-preferred }

    Multicast load splitting is configured.

    The keywords in the command specify different multicast load splitting policies:

    • balance-ucmp: load splitting that ensures even load distribution among forwarding paths. This policy selects (*, G) or (S, G) entries based on forwarding capabilities of outbound interfaces in the equal-cost routes.

    • group: load splitting based on group addresses. This policy applies to the scenarios where one multicast source sends data to multiple groups.

    • source: load splitting based on source addresses. This policy applies to the scenarios where one group receives data from multiple sources.

    • source-group: load splitting based on source addresses and group addresses. This policy applies to the scenarios with multiple sources and multiple groups.

    • stable-preferred: load splitting that ensures stable multicast forwarding. This policy applies to networks with stable multicast services.

      If the stable-preferred load splitting policy is used, the switch automatically adjusts traffic on equal-cost routes when equal-cost routes are added or deleted. When multicast routing entries are deleted or load splitting weights on interfaces are changed, the switch does not automatically adjust the traffic on the equal-cost routes.

  3. Run commit

    The configuration is committed.

Verifying the Configuration

After IPv6 multicast load splitting is configured, run the following command to check whether the loading splitting policy is configured successfully.

  • Run the display multicast ipv6 routing-table [ ipv6-source-address [ mask ipv6-source-mask-length ] | ipv6-group-address [ mask ipv6-group-mask-length ] | incoming-interface { interface-type interface-number | register } | outgoing-interface { exclude | include | match } { interface-type interface-number | register | none } ] * [ outgoing-interface-number [ number ] ] command to view the IPv6 multicast routing table.

Updated: 2019-04-20

Document ID: EDOC1100074724

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