Chapter 32. Internet Group Management Protocol - Lenovo RackSwitch G8264 Application Manual

Chapter 32. Internet Group Management Protocol

© Copyright Lenovo 2016
Internet Group Management Protocol (IGMP) is used by IPv4 Multicast routers
(Mrouters) to learn about the existence of host group members on their directly
attached subnet. The IPv4 Mrouters get this information by broadcasting IGMP
Membership Queries and listening for IPv4 hosts reporting their host group
memberships. This process is used to set up a client/server relationship between an
IPv4 multicast source that provides the data streams and the clients that want to
receive the data. The switch supports three versions of IGMP:
 IGMPv1: Defines the method for hosts to join a multicast group. However, this
version does not define the method for hosts to leave a multicast group. See RFC
1112 for details.
 IGMPv2: Adds the ability for a host to signal its desire to leave a multicast
group. See RFC 2236 for details.
 IGMPv3: Adds support for source filtering by which a host can report interest in
receiving packets only from specific source addresses, or from all but specific
source addresses, sent to a particular multicast address. See RFC 3376 for details.
The G8264 can perform IGMP Snooping, and connect to static Mrouters. The G8264
can act as a Querier, and participate in the IGMP Querier election process.
The following topics are discussed in this chapter:
 "IGMP Terms" on page 494
 "How IGMP Works" on page 495
"IGMP Capacity and Default Values" on page 496

 "IGMP Snooping" on page 498
"IGMP Relay" on page 511

 "Additional IGMP Features" on page 520
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