Multi-Instance Igmp - HP A8800 Configuration Manual

Downstream interface—An interface that is running IGMP and is not in the direction toward the
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root of the multicast forwarding tree. A downstream interface acts as a router that is running IGMP.
Therefore, it is also called the "router interface".
• An IGMP proxy device 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.
An IGMP proxy device performs host functions on the upstream interface based on the database. It
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responds to queries according to the information in the database or sends join/leave messages
when the database changes. On the other hand, the IGMP 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 base. 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 1 1 12, Host Extensions for IP Multicasting
RFC 2236, Internet Group Management Protocol, Version 2
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RFC 3376, Internet Group Management Protocol, Version 3
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RFC 4605, Internet Group Management Protocol (IGMP)/Multicast Listener Discovery (MLD)-Based
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Multicast Forwarding ("IGMP/MLD Proxying")
IGMP configuration task list
Task
Configuring basic IGMP
functions
Adjusting IGMP performance
Enabling IGMP
Configuring IGMP versions
Configuring static joining
Configuring a multicast group filter
Setting the maximum number of multicast groups that an
interface can join
Configuring Router-Alert option handling methods
Configuring IGMP query and response parameters
Configuring IGMP fast-leave processing
Enabling the IGMP host tracking function
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Remarks
Required.
Optional.
Optional.
Optional.
Optional.
Optional.
Optional.
Optional.
Optional.