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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 IPv4 Multicast Load Splitting

Configuring IPv4 Multicast Load Splitting


By default, if there are multiple equal-cost routes to a multicast source, a switch applies the following route selection rules during a reverse path forwarding (RPF) check:

  • If the equal-cost routes are in the same routing table, for example, a unicast routing table, multicast static routing table, or Multiprotocol Border Gateway Protocol (MBGP) routing table, the switch selects the route with the largest next-hop address as the RPF route.
  • If the equal-cost routes are in different routing tables, the switch selects the route with the highest preference. If multiple routes have the highest preference, the switch selects the route with the longest mask length. If multiple routes have the longest preference, the switch uses an algorithm to select an RPF route.

In this default configuration, the switch selects only one route as the RPF route, regardless of which condition is met. Multicast load splitting enables the switch to distribute multicast data among multiple equal-cost paths based on a specific load splitting policy. This function improves quality of multicast forwarding.


  1. Run system-view

    The system view is displayed.

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

    Multicast load splitting is configured.

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

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

    • stable-preferred: ensures stable multicast forwarding. Use this policy on a network with stable multicast services.

      If this load splitting policy is used, the switch automatically adjusts traffic on equal-cost routes when equal-cost routes are added or deleted. However, 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.

    • group: load splitting by group address. Use this policy in scenarios where one multicast source sends data to multiple groups.

    • source: load splitting by source address. Use this policy in scenarios where one group receives data from multiple sources.

    • source-group: load splitting by source address and group address. Use this policy in scenarios where multiple sources send data to multiple groups.

  3. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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