Igmp Configuration (Available Only On The A5500 Ei); Igmp Overview; Igmp Versions; Introduction To Igmpv1 - HP A5500 SI Switch Series Configuration Manual

IGMP configuration (available only on the
A5500 EI)
NOTE:
router
The term
The interfaces in this document refer to Layer 3 interfaces in generic sense and Ethernet interfaces
operating in route mode. For more information about the operating mode of the Ethernet interface,
Layer 2—LAN Switching Configuration Guide
see the

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 and adjacent multicast routers to establish and
maintain their multicast group memberships.

IGMP versions

IGMP has the following versions:
IGMPv1—Documented in RFC 1112
•
IGMPv2—Documented in RFC 2236
•
IGMPv3—Documented in RFC 3376
•
All IGMP versions support the Any-Source Multicast (ASM) model. In addition to support for the ASM
model, IGMPv3 can be directly deployed to implement the Source-Specific Multicast (SSM) model, but
IGMPv1 and IGMPv2 must work with the IGMP SSM mapping function to implement the SSM model.
NOTE:
For more information about the ASM and SSM models, see the chapter "Multicast overview."

Introduction to IGMPv1

IGMPv1 manages multicast group memberships mainly based on the query and response mechanism.
All routers on the same subnet can receive IGMP membership report messages—often called "reports"—
from hosts, but the subnet needs only one router for sending IGMP query messages—often called
"queries." The querier election mechanism determines which router acts as the IGMP querier on the
subnet.
In IGMPv1, the designated router (DR) elected by the working multicast routing protocol—such as PIM—
serves as the IGMP querier.
NOTE:
For more information about DR, see the chapter "PIM configuration."
in this document refers to both routers and Layer 3 switches.
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