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ONFIGURING
THE
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WITCH
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reduces the network overhead required by a multicast server, the broadcast
traffic must be carefully pruned at every multicast switch/router it passes
through to ensure that traffic is only passed on the hosts which subscribed
to this service.
This switch uses IGMP (Internet Group Management Protocol) to query
for any attached hosts that want to receive a specific multicast service. It
identifies the ports containing hosts requesting to join the service and
sends data out to those ports only. It then propagates the service request
up to any neighboring multicast switch/router to ensure that it will
continue to receive the multicast service. This procedure is called multicast
filtering.
The purpose of IP multicast filtering is to optimize a switched network’s
performance, so multicast packets will only be forwarded to those ports
containing multicast group hosts or multicast routers/switches, instead of
flooding traffic to all ports in the subnet (VLAN).
Configuring IGMP Parameters
You can configure the switch to forward multicast traffic intelligently.
Based on the IGMP query and report messages, the switch forwards traffic
only to the ports that request multicast traffic. This prevents the switch
from broadcasting the traffic to all ports and possibly disrupting network
performance.
Command Usage
• IGMP Snooping – This switch can passively snoop on IGMP Query
and Report packets transferred between IP multicast routers/switches
and IP multicast host groups to identify the IP multicast group
members. It simply monitors the IGMP packets passing through it,
picks out the group registration information, and configures multicast
filters accordingly.