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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 Silent

Configuring IPv6 PIM Silent

Pre-configuration Tasks

Before configuring IPv6 PIM silent, complete the following tasks:

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


On the access layer, if the IPv6 PIM protocol is enabled on the interfaces directly connected to user hosts, the interfaces can establish PIM neighbor relationships to process various IPv6 PIM packets. The configuration, however, brings security risks. When a host maliciously sends many IPv6 PIM Hello messages, the device may break down.

To prevent the preceding case, set the state of the device interface to IPv6 PIM silent. When the interface is in IPv6 PIM silent state, the interface is disabled from receiving and forwarding any IPv6 PIM packet. All IPv6 PIM neighbors and IPv6 PIM state machines on the interface are deleted. The interface functions as the static DR and immediately takes effect. The IPv6 PIM silent function does not affect the MLD function on the interface.

IPv6 PIM client takes effect on an interface only when the interface is directly connected to a user network segment and when the network segment is connected only to this PIM device.

  • After you configure IPv6 PIM silent on an interface, the interface no longer receives or sends any IPv6 PIM packets and other IPv6 PIM functions on the interface become invalid. Exercise caution when configuring this function.

  • If a user network segment is connected to multiple devices and IPv6 PIM silent is enabled on interfaces of multiple devices, the interfaces become static DRs. This results in multicast faults.


  1. Run:


    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. (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.

  4. Run:

    pim ipv6 silent

    The IPv6 PIM silent function is enabled.

Checking the Configuration

After IPv6 PIM silent is configured, check information about the PIM interface.

  • Run the display pim ipv6 interface [ interface-type interface-number | up | down ] [ verbose ] command to check IPv6 PIM information on an interface.
Updated: 2019-12-27

Document ID: EDOC1000141903

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