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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 PIM-SM in the SSM Model

Configuring IPv6 PIM-SM in the SSM Model


An IPv6 PIM-SM network uses the SSM model to provide specified multicast services for user hosts. User hosts in a multicast group can receive multicast data sent from the specified multicast source to this group.

Pre-configuration Tasks

Before configuring IPv6 PIM-SM in the SSM model, configure an IPv6 unicast routing protocol to ensure that unicast routes on the network are reachable.

Configuration Process

Enabling IPv6 PIM-SM is a mandatory task. Configuring an SSM group policy is optional and can control the address range of SSM groups.

Enabling IPv6 PIM-SM


IPv6 PIM-DM and IPv6 PIM-SM cannot be enabled simultaneously on a switch.

It is recommended that you enable IPv6 PIM-SM on all interfaces in a PIM-SM domain, so that the interfaces can establish neighbor relationships with all connected PIM devices.

If IPv6 PIM-SM and MLD need to be enabled on the same interface, enable IPv6 PIM-SM, and then enable MLD.


  1. Run:


    The system view is displayed.

  2. (Optional) Run:

    set multicast forwarding-table super-mode

    The high specification mode is configured for multicast forwarding.

    In large-scale multicast applications, the switch generates a large number of IPv6 PIM routing entries. When the number of IPv6 PIM routing entries reaches the default limit, new IPv6 PIM routing entries cannot be generated. The high specification mode increases the number of IPv6 PIM routing entries supported on the switch. After this mode is configured, the number of IPv6 PIM routing entries can reach the maximum number supported by the switch, maximizing the switch's capability to support large-scale multicast applications.

    • The configuration of high specification mode takes effect after a restart.

    • After the high specification mode is configured, the default interval for sending IPv6 PIM-SM Join/Prune messages changes from 210s to 300s.

  3. (Optional) Run:

    assign multicast-resource-mode optimize

    The multicast replication capability of LPUs is improved.

    If the switch needs to replicate a huge number of multicast packets, run this command to improve the multicast replication capability before enabling IPv6 multicast routing.

  4. Run:

    multicast ipv6 routing-enable

    The IPv6 multicast routing function is enabled.

  5. Run:

    interface interface-type interface-number

    The interface view is displayed.

  6. (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.

  7. Run:

    pim ipv6 sm

    IPv6 PIM-SM is enabled.

(Optional) Configuring an SSM Group Policy


By default, the address range of SSM groups is FF3x::/32 (x cannot be 1 or 2). You can configure an SSM group policy to control the SSM group address range for the following purposes:
  • Limiting the SSM group address range to ensure the security of multicast networks
  • Expanding the SSM group address range if the addresses in the default range are insufficient


  1. Run:


    The system view is displayed.

  2. Run:


    The PIM-IPv6 view is displayed.

  3. Run:

    ssm-policy { basic-acl6-number | acl6-name acl6-name }

    The SSM group address range is configured.


    Ensure that the SSM group address range of all devices in the network are the same.

Checking the Configuration


After configuration of IPv6 PIM-SM in SSM model is complete, check the IPv6 PIM interface, IPv6 PIM neighbor, and IPv6 PIM routing table.


  • Run the display pim ipv6 interface [ interface-type interface-number | up | down ] [ verbose ] command to check IPv6 PIM information on an interface.
  • Run the display pim ipv6 neighbor [ ipv6-link-local-address | interface interface-type interface-number | verbose ] * command to check information about IPv6 PIM neighbors.
  • Run the following commands to check the IPv6 PIM routing table.

    • display pim ipv6 routing-table [ ipv6-source-address [ mask mask-length ] | ipv6-group-address [ mask mask-length ] | flags flag-value | fsm | incoming-interface { interface-type interface-number | register } | mode { dm | sm | ssm } | outgoing-interface { exclude | include | match } { interface-type interface-number | none | register } ] * [ outgoing-interface-number [ number ] ]
    • display pim ipv6 routing-table brief [ ipv6-source-address [ mask mask-length ] | ipv6-group-address [ mask mask-length ] | incoming-interface { interface-type interface-number | register } ] *

Updated: 2019-08-21

Document ID: EDOC1000141903

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