H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches Chapter 4 IGMP Configuration
4-1
Chapter 4 IGMP Configuration
When configuring IGMP, go to the following sections for the information you are
interested in:
z IGMP Overview
z Configuring Basic Functions of IGMP
z Adjusting IGMP Performance
z Displaying and Maintaining IGMP
z IGMP Configuration Example
z Troubleshooting IGMP
 Note:
The term “router” in this document refers to a router in a generic sense or a Layer 3
switch running IGMP.
4.1 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.
4.1.1 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, IGMPv3
can be directly used to implement the Source-Specific Multicast (SSM) model.
4.1.2 Work Mechanism of IGMPv1
IGMPv1 manages multicast group memberships mainly based on the query and
response mechanism.
Of multiple multicast routers on the same subnet, all the routers can hear IGMP
membership report messages (often referred to as reports) from hosts, but only one