Multicast Access Control; Igmp Support For Vpns - HP VSR1000 Configuration Manual

Figure 22 IGMP proxying
Proxy
Router B
Receiver
Host A
The following types of interfaces are defined in IGMP proxying:
•
Host interface—An interface that is in the direction toward the root of the multicast forwarding
tree. A host interface acts as a receiver host that is running IGMP. IGMP proxying must be
enabled on this interface. This interface is also called the "proxy interface."
•
Router interface—An interface that is in the direction toward the leaf of the multicast
forwarding tree. A router interface acts as a router that is running IGMP. IGMP must be
configured on this interface.
An IGMP proxy device maintains a group membership database, which stores the group
memberships on all the router interfaces. The host interfaces and router interfaces perform actions
based on this membership database.
•
The host interfaces respond to queries according to the membership database or send
join/leave messages when the database changes.
•
The router interfaces participate in the querier election, send queries, and maintain
memberships based on received IGMP reports.

Multicast access control

IP multicast allows users to join any multicast group in order to receive multicast data. In some
carrier's services, such as IPTV, users are authenticated and authorized before accessing multicast
data.
Multicast access control provides a mechanism to control a user's access to multicast data by
limiting the multicast groups that the user can join. When a user logs in, the BRAS downloads the
access authorization profile of the user. Based on the authorization profile, the BRAS accepts or
denies the reports from the user to join multicast groups.

IGMP support for VPNs

IGMP maintains group memberships on a per-interface basis. After receiving an IGMP message on
an interface, IGMP processes the packet within the VPN to which the interface belongs. IGMP only
communicates with other multicast protocols within the same VPN instance.
Querier
Router A
Ethernet
Host B
Query from Router A
Query from Router B
Report from Host
PIM domain
Receiver
Host C
Report from Router B
Host interface
Router interface
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