Intel Express 530T, Руководство пользователя

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C H A P T E R 5 Intel
®
Express 530T Switch Users Guide
66
Configure IGMP Snooping
Description
IGMP Snooping (Internet Group Management Protocol) is a feature that
allows the switch to forward multicast traffic intelligently. The switch
“snoops” the IGMP query and report messages and forwards traffic only
to the ports that request the multicast traffic. This prevents the switch
from broadcasting the traffic to all ports and possibly affecting network
performance.
IGMP requires a router that learns about the presence of multicast groups
on its subnets and keeps track of group membership. Multicasting is not
connection oriented, so data is delivered to the requesting hosts on a best-
effort level of service.
NOTE
If tag-based (IEEE 802.1Q) or
port-based VLANs are
currently running and you
want to enable IGMP snooping
for any of the VLANs, you must
enable IGMP snooping for
each VLAN separately. The
switch supports a maximum of
24 VLAN IGMP snooping
sessions.
VLAN name (when port-based or tag-based VLANs are running):
The VLAN for which IGMP snooping is enabled. You can also enable
IGMP snooping for a VLAN in the Configure VLAN section.
IGMP snooping state: Use the
z
to enable or disable IGMP
Snooping.
IGMP snooping age-out timer: Specify the acceptable time (in
seconds) between IGMP queries since the switch last received an IGMP
query from the multicast server. The default time is 300 seconds. A query
allows the server to determine which network hosts are (or want to be)
part of the IP multicast group, and are configured and ready to receive
traffic for the given application.
LOCATION
Main Menu
Configure Stack
Forwarding and Filtering
IGMP Snooping
530-Chapter5-part1.fm Page 66 Monday, September 11, 2000 4:16 PM