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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring PIM Silent

Configuring PIM Silent

To protect router interfaces directly connected to hosts against pseudo PIM Hello packets, configure PIM silent.

Usage Scenario

If PIM-SM is enabled on router interfaces directly connected to user hosts, these interfaces can set up PIM neighbor relationships and process PIM packets, so these interfaces may be attacked if malicious hosts send numerous PIM Hello packets.

To address this problem, configure PIM silent. After PIM silent is configured on an interface, the interface is not allowed to receive or forward any PIM packets and all PIM neighbor relationships and PIM state machines on this interface are deleted. Then, this interface automatically becomes a Designated router (DR). IGMP is not affected on the interface.

PIM silent applies only to the router interface that directly connects the router to only one host network segment.

If PIM silent is enabled on the interface connected to a router, PIM neighbor relationships cannot be established, and multicast faults occur.

If a host network segment connects to multiple routers and PIM silent is enabled on interfaces of multiple routers, the interfaces become static DRs. As a result, multiple DRs exist in this network segment, which will result in multicast faults.

Pre-configuration Tasks

Before configuring PIM silent, complete the following tasks:

  • Configure a unicast routing protocol to ensure that unicast routes are reachable.

  • Configure PIM-SM.
  • Configure IGMP.


  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

    PIM silent is enabled.

  4. Run commit

    The configuration is committed.

Checking the Configurations

Run the display pim [ vpn-instance vpn-instance-name | all-instance ] interface [ interface-type interface-number | up | down ] [ verbose ] command to check information about PIM interfaces.

Run the display pim interface verbose command to check whether PIM silent is enabled.
<HUAWEIA> display pim interface verbose
 VPN-Instance: public net
 Interface: GigabitEthernet1/0/0,
     PIM version: 2
     PIM mode: Sparse
     PIM DR: (local)
     PIM DR Priority (configured): 1
     PIM neighbor count: 0
     PIM hello interval: 30 s
     PIM LAN delay (negotiated): 500 ms
     PIM LAN delay (configured): 500 ms
     PIM hello override interval (negotiated): 2500 ms
     PIM hello override interval (configured): 2500 ms
     PIM Silent: enabled
     PIM neighbor tracking (negotiated): disabled
     PIM neighbor tracking (configured): disabled
     PIM generation ID: 0X2649E5DA
     PIM require-GenID: disabled
     PIM hello hold interval: 105 s
     PIM assert hold interval: 180 s
     PIM triggered hello delay: 5 s
     PIM J/P interval: 60 s
     PIM J/P hold interval: 210 s
     PIM BSR domain border: disabled 
     PIM BFD: disabled
     PIM dr-switch-delay timer: not configured 
     Number of routers on link not using DR priority: 0
     Number of routers on link not using LAN delay: 0
     Number of routers on link not using neighbor tracking: 1  
     ACL of PIM neighbor policy: -   
     ACL of PIM ASM join policy: -  
     ACL of PIM SSM join policy: -  
     ACL of PIM join policy: -
     PIM ipsec: enabled (sa-name: 1)
Updated: 2019-01-03

Document ID: EDOC1100055017

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