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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Setting the Aging Time for Entries Triggered by Multicast Traffic in a VLAN

Setting the Aging Time for Entries Triggered by Multicast Traffic in a VLAN


If no multicast data is sent to a multicast group, matching (S, G) or (*, G) entries need to be deleted. Therefore, the device needs to periodically detect presence of multicast flows sent to the multicast group to determine whether to delete the matching entry. You can set the aging time of multicast traffic triggered entries in a VLAN. If the device does not receive multicast data sent to a group within the aging time, the device deletes the corresponding (S, G) or (*, G) entry. The aging time enables the device to update multicast entries and release entry resources in a timely manner.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run multicast layer-2 source-lifetime lifetime

    The aging time is set for entries triggered by multicast traffic in the VLAN.

    By default, the aging time of an entry triggered by multicast traffic is 210s.

    Configure aging time of (S, G) or (*, G) entries according to the number of the multicast forwarding entries used. If a large number of multicast entries are used on your network, a too short aging time will make the multicast forwarding table incomplete. However, if the aging time is too long, invalid entries will be retained for a long time, wasting system resources. The following table lists the recommended aging time values for different quantities of multicast forwarding entries.

    Table 10-7 Recommended aging time for multicast forwarding entries in a VLAN

    Number of Entries

    Recommended Aging Time

    Within 1000

    Default value

    1000 to 2000

    1000 seconds

    2000 to 8000

    2000 seconds

    More than 8000

    3000 seconds or 4000 seconds

  4. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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