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5
I
NTERNET
G
ROUP
M
ANAGEMENT
P
ROTOCOL
(IGMP) S
NOOPING
This chapter provides the following information about IGMP snooping:
■
Overview
■
CoreBuilder 5000 Support
■
Locating Multicast Routers in the Network
■
No Multicast Routers on the Network
■
Enabling IGMP Snooping on CoreBuilder 5000 SwitchModules
Overview
The Internet Group Management Protocol (IGMP) runs between hosts
and their immediate neighboring multicast routers. This protocol is not
a client/server protocol, but rather a routing protocol.
Through IGMP, a host to inform its local router that it wants to receive
transmissions that are addressed to a specific multicast group. Also,
routers periodically query the LAN to determine if known group members
are still active.
Based on the group membership information learned from the IGMP, a
router can determine which (if any) multicast traffic needs to be
forwarded to each of its subnetworks. Multicast routers use this
information in conjunction with a multicast routing protocol to support IP
multicasting across the Internet. Layer 2 switches flood multicast packets
to all ports without the presence of management specified filters.