A10E/A28E/A28F Configuration Guide
Alpha-A28E(config)#ip igmp
snooping mrouter vlan
vlan-id
port-list
port-list
Configure the multicast router
interface of the specified VLAN.
IGMP Snooping can dynamically learn router interfaces (on the condition that the
multicast router is enabled with multicast route protocol, and through IGMP query
packets), or you can manually configure dynamic learning so that downstream
multicast report and leaving packets can be forwarded to the router interface.
There is aging time for the router interface dynamically learnt and no aging time
for manually configured router interface.
5.2.6 (Optional) configuring the aging time of IGMP Snooping
For IGMP Snooping, each dynamically learnt router interface initiates a timer, of which the
expiration time is the aging time of IGMP Snooping. When the timer expires, the route
interface will no longer be a router interface if it has not received IGMP Query packet, or it
updates the aging time if it receives IGMP Query packet.
Each multicast forwarding entry initiates a timer which contains the aging time of a multicast
member. The expiration time of the timer is the aging time of IGMP Snooping. When the
timer expires, the multicast member will be deleted if it has not received IGMP Report packet,
or it updates the aging time if it receives IGMP Report packet.
Enter global configuration mode.
Alpha-A28E(config)#ip igmp
snooping timeout {
period
|
infinite }
Configure the aging time of router
interface and multicast forwarding entry of
IGMP Snooping.
The aging time of IGMP Snooping configured by the previous command takes effects
on all dynamically learnt router interfaces and multicast forwarding entries on the
A10E/A28E.
5.2.7 (Optional) configuring instance leaving
For IGMP Snooping, when a user sends a Leave packet, the A10E/A28E does not
immediately delete the corresponding multicast forwarding entry, but deletes it until the aging
time of the entry expires. When downstream users are in a large number, and they join or
leave the network frequently, you can configure this function to immediately delete
corresponding multicast forwarding entries.
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