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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 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).

Context

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.

NOTE:
  • It is recommended that you use a fixed load splitting policy based on the actual situation on your network. The stable-preferred or balance-preferred load splitting policy is recommended.

  • The load splitting timer and load splitting weights can be configured when the stable-preferred or balance-preferred load splitting policy is used.

  • If PIM-DM (IPv6) is enabled on the current switch, the stable-preferred or balance-preferred policy cannot be used.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    multicast ipv6 load-splitting { balance-preferred | group | source | source-group | stable-preferred }

    Multicast load splitting is configured.

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

    • balance-preferred: load splitting that ensures even load distribution among forwarding paths. This policy applies to scenarios where users frequently join and leave multicast groups. It enables traffic distribution to be automatically adjusted to adapt to frequent changes of group memberships.

      If this load splitting policy is used, the switch automatically adjusts traffic on equal-cost routes when equal-cost routes are added or deleted, multicast routing entries are deleted, or load splitting weights on interfaces are changed.

    • 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. (Optional) Run:

    multicast ipv6 load-splitting-timer interval

    The multicast load splitting timer is set.

    By default, the value of a load splitting timer is 1800 seconds.

  4. (Optional) Set the load splitting weight of an interface.
    1. Run:

      interface interface-type interface-number

      The interface view is displayed.

    2. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    3. Run:

      multicast ipv6 load-splitting weight weight-value

      The load splitting weight is set for the interface.

      By default, the IPv6 multicast load splitting weight of an interface is 1.

Checking 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 [ ipv6-source-mask-length ] | ipv6-group-address [ 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.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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