Multi-Instance Igmp; Protocols And Standards; Configuring Basic Functions Of Igmp; Prerequisites - HP A6600 Configuration Manual

A router 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 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.
In IGMP view, the configuration is effective on all interfaces. In interface view, the configuration is
effective on only the current interface.
If a feature is not configured on an interface in interface view, the global configuration in IGMP view will
apply to that interface. If a feature is configured in both IGMP view and interface view, the configuration
in interface view will be given priority.

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")

Configuring basic functions of IGMP

Prerequisites

Before you configure the basic functions of IGMP, complete the following tasks:
Configure any unicast routing protocol so that all devices in the domain are interoperable at the
•
network layer
• Configure PIM-DM or PIM-SM
• Determine the IGMP version
Determine the multicast group and multicast source addresses for static group member configuration
•
Determine the ACL rule for multicast group filtering
•
Determine the maximum number of multicast groups that an interface can join
•
70