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CLI-based Configuration Guide - IP Multicast

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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Setting the Aging Time of Dynamic Router Ports

Setting the Aging Time of Dynamic Router Ports


Router ports send Report messages to upstream Layer 3 multicast devices and receive multicast data packets sent by upstream devices. After Multicast Listener Discovery (MLD) snooping is configured on the router, the router can dynamically learn router ports and monitor upstream multicast data forwarding in real time. When network congestion or flapping occurs, the dynamic router port does not receive MLD General Query or Protocol Independent Multicast (PIM) Hello messages before it times out. The router deletes the interface from the router port list, which causes service interruption. To avoid this problem, set a longer aging time.


  1. Run:


    The system view is displayed.

  2. Run:

    vlan vlan-id

    The VLAN view is displayed.

  3. Run:

    mld-snooping router-aging-time router-aging-time

    The aging time for dynamic router ports is configured.

    By default, the aging time of router ports that a device learns from MLD Query messages is 180 seconds and the aging time of router ports that the device learns from PIM Hello messages is the Holdtime value in PIM Hello packets.

Updated: 2019-06-12

Document ID: EDOC1000097181

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