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Multimedia Traffic Control with IP Multicast (IGMP)
Terminology
network). Switches in the network (that support IGMP) can then be config-
ured 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.
Enabling IGMP allows the ports to detect IGMP queries and report packets
and manage IP multicast traffic through the switch. If no other querier is
detected, the switch will then also function as the querier. (If you need to
disable the querier feature, you can do so by using the no ip igmp querier
command. Refer to
“Configuring the Querier Capability” on page 12-9.)
Not e IGMP configuration on the Series 5300XL switches operates at the VLAN
context level. If you are not using VLANs, then configure IGMP in VLAN 1 (the
default VLAN) context.
Terminology
IGMP: Internet Group Management Protocol. This 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 Device: A switch or router running IGMP traffic control
features.
IGMP Host: An end-node device running an IGMP (multipoint, or
multicast communication) application.
Leave Group: A message sent by a host to the querier to indicate that the
host has ceased to be a member of a specific multicast group.
Multicast Group: A set of hosts, routers, and/or switches that send or
receive multicast data streams to or from the same source(s). All devices
in the group use the same multicast group address.
Report: A message sent by a host to the querier to indicate that the host
wants to be or is a member of a given group indicated in the report
message.
Query: A message sent from the querier (multicast router or switch)
asking for a response from each host belonging to the multicast group.
For more information, refer to
“More on IGMP Operation” on page 12-10.
Querier: A required IGMP device that facilitates the IGMP protocol
and traffic flow on a given LAN. This device tracks which ports are
connected to devices (IGMP clients) that belong to specific multicast
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