3Com 4200G 12-Port Configuration Manual page 267

Configuring Timers
Enabling IGMP Fast
Leave Processing
Configuring IGMP
Snooping Filtering ACL
This configuration task is to manually configure the aging time of the router port, the
aging time of the multicast member ports, and the query response timeout time.
If the switch receives no general query message from a router within the aging
■
time of the router port, the switch removes the router port from the port member
lists of all MAC multicast groups.
If the Ethernet switch receives no IGMP report message within the maximum
■
query response time of a member port, it will remove the port from the multicast
group.
If the Ethernet switch receives no IGMP report message from a member port when
■
the query response time times out, it sends group-specific query to the port and
triggers the query response timer of the corresponding IP multicast group.
Table 223 Configure timers
Operation Command
Enter system view system-view
Configure the aging igmp-snooping router-aging-time
time of the router port seconds
Configure the query igmp-snooping max-response-time
response timeout time seconds
Configure the aging igmp-snooping host-aging-time seconds
time of multicast
member ports
Normally, when receiving an IGMP Leave message, IGMP Snooping does not
immediately remove the port from the multicast group, but sends a group-specific
query message. If no response is received in a given period, it then removes the port
from the multicast group.
If IGMP fast leave processing is enabled, when receiving an IGMP Leave message,
IGMP Snooping immediately removes the port from the multicast group. When a port
has only one user, enabling IGMP fast leave processing on the port can save
bandwidth.
Table 224 Enable the IGMP fast leave processing
Operation Command
Enter system view system-view
Enter Ethernet port interface interface-type interface-number
view
Enable IGMP fast leave igmp-snooping fast-leave vlan vlan-id [
processing to vlan-id ]
You can configure multicast filtering ACLs globally or on the switch ports connected
to user ends so as to use the IGMP Snooping filter function to limit the multicast
streams that the users can access. With this function, you can treat different VoD
users in different ways by allowing them to access the multicast streams in different
multicast groups.
IGMP Snooping Configuration 253
Description
—
Optional
By default, the aging
time of the router port is
105 seconds.
Optional
By default, the query
response timeout time is
10 seconds.
Optional
By default, the aging
time of multicast
member ports is 260
seconds.
Description
—
—
Optional
By default this function is
disabled.