3Com S7902E, Configuration Manual

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1-11
To do... Use the command... Remarks
Enter IGMP snooping view
igmp-snooping
—
Configure the maximum
number of global forwarding
entries
entry-limit limit
Required
1000 by default.
If the number of existing entries is larger than the limit when you configure it, the device informs you to
remove excessive entries. In this case, the device does not automatically remove any existing entries or
create any new entries.
Configuring IGMP Snooping Port Functions
Configuration Prerequisites
Before configuring IGMP snooping port functions, complete the following tasks:
z
Enable IGMP snooping in the VLAN
z
Configure the corresponding port groups.
Before configuring IGMP snooping port functions, prepare the following data:
z
Aging time of dynamic router ports,
z
Aging time of dynamic member ports, and
z
Multicast group and multicast source addresses
Configuring Aging Timers for Dynamic Ports
If the switch receives no IGMP general queries or PIM hello messages on a dynamic router port, the
switch removes the port from the router port list when the aging timer of the port expires.
If the switch receives no IGMP reports for a multicast group on a dynamic member port, the switch
removes the port from the outgoing port list of the forwarding table entry for that multicast group when
the aging timer of the port for that group expires.
If multicast group memberships change frequently, you can set a relatively small value for the dynamic
member port aging timer, and vice versa.
Configuring aging timers for dynamic ports globally
Follow these steps to configure aging timers for dynamic ports globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter IGMP snooping view igmp-snooping —
Configure dynamic router port
aging time
router-aging-time interval
Optional
105 seconds by default