Protocols And Standards; Igmp Configuration Task List - HP 4800G Series Configuration Manual

Figure 1-4 Network diagram for IGMP proxying
Proxy & Querier
Router B
Receiver
Host A
Query from Router A
Report from Router B
Query from Router B
As shown in Figure
Upstream interface: Also referred to as the proxy interface. A proxy interface is an interface on
which IGMP proxying is configured. It is in the direction toward the root of the multicast forwarding
tree. An upstream interface acts as a host running IGMP; therefore, it is also called host interface.
Downstream interface: An interface that is running IGMP and not in the direction toward the root of
the multicast forwarding tree. A downstream interface acts as a router running IGMP; therefore, it is
also called router interface.
A device with IGMP proxying configured maintains a group membership database, which storesthe
group memberships on all the downstream interfaces. Each entry comprises the multicast address,
filter mode, and source list. Such an entry is a collection of members in the same multicast group on
each downstream interface.
A proxy device performs host functions on the upstream interface based on the database. It responds to
queries according to the information in the database or sends join/leave messages when the database
changes. On the other hand, the proxy device performs router functions on the downstream interfaces
by participating in the querier election, sending queries, and maintaining memberships based on the
reports.

Protocols and Standards

The following documents describe different IGMP versions:
RFC 1112: Host Extensions for IP Multicasting
RFC 2236: Internet Group Management Protocol, Version 2
RFC 3376: Internet Group Management Protocol, Version 3
RFC 4605: Internet Group Management Protocol (IGMP)/Multicast Listener Discovery
(MLD)-Based Multicast Forwarding ("IGMP/MLD Proxying")

IGMP Configuration Task List

Complete these tasks to configure IGMP:
Querier
Router A
Ethernet
Host B
1-4, two types of interfaces are defined on an IGMP proxy device:
PIM domain
Receiver
Host C
Report from Host
Host interface
Router interface
1-7