Setting aging timers for dynamic ports

When you set aging timers for dynamic ports, follow these guidelines:

If the memberships of multicast groups frequently change, you can set a relatively small value for the aging timer of the dynamic member ports. If the memberships of multicast groups rarely change, you can set a relatively large value.
If a dynamic router port receives a PIMv2 hello message, the aging timer for the port is specified by the hello message. In this case, the router-aging-time command or the igmp-snooping router-aging-time command does not take effect on the port.
IGMP group-specific queries originated by the Layer 2 device trigger the aging timer adjustment of dynamic member ports. If a dynamic member port receives such a query, its aging timer is set to twice the IGMP last member query interval. For more information about setting the IGMP last member query interval on the Layer 2 device, see "Setting the IGMP last member query interval."
You can set the timers globally for all VLANs in IGMP-snooping view or for a VLAN in VLAN view. For a VLAN, the VLAN-specific configuration takes priority over the global configuration.

Setting the aging timers for dynamic ports globally

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter IGMP-snooping view.	igmp-snooping	N/A
3. Set the aging timer for dynamic router ports globally.	router-aging-time interval	The default setting is 260 seconds.
4. Set the aging timer for dynamic member ports globally.	host-aging-time interval	The default setting is 260 seconds.

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter VLAN view.	vlan vlan-id	N/A
3. Set the aging timer for dynamic router ports in the VLAN.	igmp-snooping router-aging-time interval	The default setting is 260 seconds.
4. Set the aging timer for dynamic member ports in the VLAN.	igmp-snooping host-aging-time interval	The default setting is 260 seconds.

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