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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 PIM-SM in the SSM Model

Configuring IPv6 PIM-SM in the SSM Model

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.


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.

Configuration Procedure

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

Enabling IPv6 PIM-SM


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.


  1. Run system-view

    The system view is displayed.

  2. (Optional) Run multicast forwarding optimization

    Multicast forwarding optimization is enabled.

    By default, multicast forwarding optimization is disabled.

    After multicast forwarding optimization is enabled on a standalone switch or a stack, the switch or stack dynamically adjusts traffic forwarding on switch fabrics or stack ports for each multicast group based on multicast traffic distribution in the system. This function saves multicast forwarding resources, but it consumes some processing resources and increases the response time to users' multicast requests. To enable multicast traffic to be transmitted to users quickly, disable the multicast forwarding optimization function.


    The CE12800 supports this function. The CE12800E does not support this function after FD-X series cards are installed.

  3. Run multicast ipv6 routing-enable

    The IPv6 multicast routing function is enabled.

  4. Run interface interface-type interface-number

    The interface view is displayed.

  5. 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.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  6. Run pim ipv6 sm

    IPv6 PIM-SM is enabled.

  7. Run commit

    The configuration is committed.

(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 security of multicast networks
  • Expanding the SSM group address range if the addresses in the default range are insufficient


  1. Run system-view

    The system view is displayed.

  2. Run pim ipv6

    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.

  4. Run commit

    The configuration is committed.

Verifying the Configuration of IPv6 PIM-SM in the SSM Model


After configuration of IPv6 PIM-SM in SSM model is complete, you can 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 { 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: 2019-04-20

Document ID: EDOC1100074724

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