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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
• 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
Task Remarks
Configuring basic IGMP
functions
Enabling IGMP Required
Configuring IGMP versions Optional
Configuring static joining Optional
Configuring a multicast group filter Optional
Setting the maximum number of multicast groups
that an interface can join
Optional
Adjusting IGMP performance
Configuring Router-Alert option handling
methods
Optional
Configuring IGMP query and response
parameters
Optional
Configuring IGMP fast-leave processing Optional
Enabling the IGMP host tracking function Optional
Setting the DSCP value for IGMP messages Optional
Configuring IGMP SSM
mapping
Enabling SSM mapping Optional
Configuring SSM mappings Optional
Configuring IGMP proxying
Enabling IGMP proxying Optional
Configuring multicast forwarding on a
downstream interface
Optional
For the configuration tasks in this section:
• In IGMP view, the configuration is effective on all interfaces. In interface view, the configuration is
effective on only the current interface.
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