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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 GR

Configuring IPv6 PIM GR

Pre-configuration Tasks

Before configuring IPv6 PIM GR, complete the following tasks:

  • Configure an IPv6 unicast routing protocol to ensure normal unicast routing on the network.
  • Enable IPv6 PIM-SM.


Multicast devices may need to perform active/standby switchovers in some scenarios, for example, when the multicast devices need to be upgraded or their control boards fail. After an active/standby switchover, the new active main control board deletes the forwarding entries on interface boards and re-learns the IPv6 PIM routing table and multicast forwarding table. During this process, multicast traffic is interrupted.

IPv6 PIM-SM supports the IPv6 PIM GR function on a switch with dual main control units. IPv6 PIM GR ensures normal multicast data forwarding during active/standby switchover on the switch.

After the PIM GR function is configured, the active main control board of the multicast device backs up IPv6 PIM routing entries and Join/Prune information to be sent upstream to the standby main control board. The interface boards maintain forwarding entries. When an active/standby switchover occurs in the system, the multicast device quickly sends Join messages upstream to maintain the Join state of the upstream multicast device. Then, the IPv6 PIM protocol sends Hello messages carrying Generation IDs to all neighbors with IPv6 PIM-SM enabled. When a downstream multicast device finds that the Generation ID of its neighbor changes, it sends a Join/Prune message to the neighbor so that the neighbor can create new routing entries. This mechanism ensures nonstop forwarding of multicast data on the forwarding plane.

On a network using dynamic RP, when a DR receives a Hello message with a Generation ID different from the previous one, the DR sends a unicast Bootstrap message to the multicast device. The multicast device then restores the RP information from the Bootstrap message. If the multicast device cannot learn RP information from the Bootstrap message, it obtains RP information from the Join/Prune messages received from downstream devices and generates new multicast entries.

Default Configuration

The default IPv6 PIM GR period is 120s.


  1. Run:


    The system view is displayed.

  2. Run:


    The PIM-IPv6 view is displayed.

  3. Run:


    PIM GR is enabled.

    By default, IPv6 PIM GR is not enabled.

  4. (Optional) Run:

    graceful-restart period period

    The PIM GR period is configured.

    By default, the IPv6 PIM GR period is 120 seconds.

Checking the Configuration

After IPv6 PIM GR is configured, run the following commands to check entries in 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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