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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
How Do I Change the Aging Time of Multicast Traffic Triggered Entries in a VLAN?

How Do I Change the Aging Time of Multicast Traffic Triggered Entries 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 use the multicast layer-2 source-lifetime lifetime command to 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.

By default, the aging time of a multicast traffic triggered entry in a VLAN is 210 seconds. You can set a proper aging time for (S, G) or (*, G) entries according to the number of multicast entries used on your network. 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 entries.

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

The following example sets the aging time of multicast traffic triggered entries to 1000 seconds in VLAN 100.

<HUAWEI> system-view
[~HUAWEI] igmp snooping enable
[*HUAWEI] vlan 100
[*HUAWEI-vlan100] igmp snooping enable
[*HUAWEI-vlan100] multicast layer-2 source-lifetime 1000
[*HUAWEI-vlan100] commit
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Updated: 2020-01-07

Document ID: EDOC1000060766

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