Multi-instance igmp, Protocols and standards, Igmp configuration task list – H3C Technologies H3C S10500 Series Switches User Manual

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A device with IGMP proxying configured maintains a group membership database, which stores the

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.

Multi-instance IGMP

IGMP maintains group memberships on a per-interface basis. IGMP in an instance handles protocol

packets based on the instance on the interface. After receiving an IGMP packet, the router determines the

instance to which the message belongs and handles the message within the instance. If IGMP running in
an instance needs to exchange information with another multicast protocol, the router informs the other

multicast protocol only within the instance.

Protocols and standards

•

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: