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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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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 from upstream devices. After MLD snooping is configured on a switch, the switch dynamically learns router ports and monitors upstream multicast data forwarding in real time. When network congestion or flapping occurs, dynamic router ports cannot receive Internet Group Management Protocol (IGMP) General Query or Protocol Independent Multicast (PIM) Hello messages before it times out. The switch then deletes these router ports from the router port list, causing service interruption. To prevent 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 is configured for dynamic router ports.

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

Updated: 2019-08-21

Document ID: EDOC1000141903

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