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CLI-based Configuration Guide - IP Multicast

AR500, AR510, and AR530 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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Configuring PIM Silent

Configuring PIM Silent

Pre-configuration Tasks

Configuring Basic PIM-DM Functions

Context

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

To prevent the preceding case, set the state of the device interface to PIM silent. An interface in PIM silent state is disabled from receiving and forwarding any PIM packet. All PIM neighbors and PIM state machines on the interface are deleted, and the interface immediately becomes a static DR. The PIM silent function does not affect the Internet Group Management Protocol (IGMP) function on the interface.

PIM silent 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 PIM silent on an interface, the interface no longer receives or sends any PIM packets and other PIM functions on the interface become invalid. Confirm your action before configuring this function.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. Run:

    pim silent

    The PIM silent function is enabled.

Checking the Configuration

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

Run the display pim [ vpn-instance vpn-instance-name | all-instance ] interface [ interface-type interface-number | up | down ] [ verbose ] command to check PIM information on an interface.
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Updated: 2019-06-12

Document ID: EDOC1000097280

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