3com 8807 User Guide

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Isolate-user-VLAN supports the IGMP-Snooping function. After IGMP-Snooping 
is enabled under isolate-user-VLAN, all secondary VLANs are IGMP-Snooping 
enabled. It makes no sense to enable IGMP-Snooping for a secondary VLAN.

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In a secondary VLAN, IGMP packets will be directly converted and processed in 
isolate-user-VLAN, namely all the multicast services are implemented within 
isolate-user-VLAN.

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Ports in secondary VLANs cannot be used as source addresses of multicast.

This task is to manually configure the router port aging time. If the switch has not 
received any general query message from the router before the router port is 
aged, it will remove the port from all MAC multicast groups.

Perform the following configuration in system view.

By default, the router port aging time is 105s.

This task is to manually configure the maximum response time. If the Ethernet 
switch receives no report message from a port within the maximum response time, 
it will remove the port from the multicast group.

Perform the following configuration in system view.

By default, the maximum response time is 1 seconds.

This task is to manually set the aging time of the multicast group member port. If 
the Ethernet switch receives no multicast group report message during the 
member port aging time, it will transmit the specific query message to that port 
and starts a maximum response timer.

Perform the following configuration in system view.

Table 412   Configure router port aging time

Configure router port aging time 

igmp-snooping router-aging-time seconds 

Restore the default aging time of the router 
port 

Table 413   Configure the maximum response time

Configure the maximum response time 

igmp-snooping max-response-time 
seconds 

Restore the default setting 

Table 414   Configure aging time of the multicast member ports

Configure aging time of the multicast 
member 

igmp-snooping host-aging-time seconds 

Restore the default setting