3Com S7906E - Switch, Configuration Manual

Page: 993 / 2621

1-1
1
IGMP Configuration
When configuring IGMP, go to the following sections for the information you are interested in:
z
IGMP Overview
z
IGMP Configuration Task List
z
IGMP Configuration Examples
z
Troubleshooting IGMP
z
The term "router" in this document refers to a router in a generic sense or a Layer 3 switch running
an IP routing protocol.
z
The S7900E Series Ethernet Switches are distributed devices that support Intelligent Resilient
Framework (IRF). Two S7900E series can be connected together to form a distributed IRF device.
If an S7900E series is not in any IRF, it operates as a distributed device; if the S7900E series is in
an IRF, it operates as a distributed IRF device. For introduction of IRF, refer to IRF Configuration in
the System Volume.
IGMP Overview
As a TCP/IP protocol responsible for IP multicast group member management, the Internet Group
Management Protocol (IGMP) is used by IP hosts to establish and maintain their multicast group
memberships to immediately neighboring multicast routers.
IGMP Versions
So far, there are three IGMP versions:
z
IGMPv1 (documented in RFC 1112)
z
IGMPv2 (documented in RFC 2236)
z
IGMPv3 (documented in RFC 3376)
All IGMP versions support the Any-Source Multicast (ASM) model. In addition to support of the ASM
model, IGMPv3 can be directly deployed to implement the Source-Specific Multicast (SSM) model,
while IGMPv1 and IGMPv2 need to work with the IGMP SSM mapping function to implement the SSM
model.