H3C Technologies H3C S7500E Series Switches - Manual (Page 330)

12-10
z Upstream interface: Also referred to as the proxy interface. A proxy interface is an interface on
which MLD proxying is configured. It is in the direction toward the root of the multicast forwarding
tree. An upstream interface acts as a host running MLD; therefore, it is also called host interface.
z Downstream interface: An interface that is running MLD and not in the direction toward the root of
the multicast forwarding tree. A downstream interface acts as a router running MLD; therefore, it
is also called router interface.
A device with MLD proxying configured maintains a group membership database, which stores the
group memberships on all the downstream interfaces in this database. 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 the 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
MLD-related specifications are described in the following documents:
z RFC 2710: Multicast Listener Discovery (MLD) for IPv6
z RFC 3810: Multicast Listener Discovery Version 2 (MLDv2) for IPv6
z RFC 4605: Internet Group Management Protocol (IGMP)/Multicast Listener Discovery
(MLD)-Based Multicast Forwarding (“IGMP/MLD Proxying”)
Configuration Task List
Task Remarks
Enabling MLD Required
Configuring the MLD Version Option
Configuring Static Joining Optional
Configuring an IPv6 Multicast Group Filter Optional
Configuring Basic Functions of MLD
Configuring the Maximum Number of Multicast
Groups on an Interface
Optional
Configuring MLD Message Options Optional
Configuring MLD Query and Response
Parameters
Optional Adjusting MLD Performance
Configuring MLD Fast Leave Processing Optional
Enabling MLD SSM Mapping Optional
Configuring MLD SSM Mapping
Configuring MLD SSM Mappings Optional