How Igmp Operates - HP procurve 8100fl series Management And Configuration Manual

Multimedia Traffic Control with IP Multicast (IGMP)

How IGMP Operates

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For example, suppose that show ip igmp snooping listed an IGMP group address
of 224.0.1.22. You could get additional data on that group by executing the
following command.
ProCurve#show ip igmp snooping group 224.0.1.22
IGMP ports for group 224.0.1.22
Port Access
Gig5/2 host
Gig5/4 host-router
Gig5/3 host-router

How IGMP Operates

The Internet Group Management Protocol (IGMP) is an internal protocol of
the Internet Protocol (IP) suite. IP manages multicast traffic by using
switches, multicast routers, and hosts that support IGMP. IGMP is useful in
multimedia applications such as LAN TV, desktop conferencing, and
collaborative computing, where there is multipoint communication; that is,
communication from one to many hosts, or communication originating from
many hosts and destined for many other hosts. In such multipoint
applications, IGMP will be configured on the hosts, and multicast traffic will
be generated by one or more servers (inside or outside of the local network).
Switches can then be configured to direct the multicast traffic to only the ports
where needed. If multiple VLANs are configured, you can configure IGMP on
a per-VLAN basis.
In ProCurve's implementation of IGMP, a multicast router is not necessary as
long as a switch is configured to support IGMP with the
enabled.) A set of hosts, routers, and/or switches that send or receive multicast
data streams to or from the same source(s) is termed a multicast group, and
all devices in the group use the same multicast group address.
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