Multicast

Multicast is the simultaneous delivery of information to a group of destinations using the most efficient strategy to deliver the messages over each link of the network, creating copies only when the links to the destinations split. It is usually implemented in Internet Protocol (IP) Multicast, a technique for many-to-many communication over an IP infrastructure. It scales to a larger receiver population by not requiring prior knowledge of who or how many receivers there are.

Multicast utilizes network infrastructure efficiently by requiring the source to send a packet only once, even if it needs to be delivered to a large number of receivers. The nodes in the network take care of replicating the packet to reach multiple receivers only where necessary.

The PREGINET network provides support for Multiprotocol Extensions for BGP, Protocol Independent Multicast-Sparse Mode, and Multicast Source Discovery Protocol on all core routers.

Among the PREGINET services that are multicast capable are the AccessGrid.org, Digital Video Transport System (DVTS), Research Channel and School-on-Internet Asia Project.

Multiprotocol Extensions for BGP (MBGP)

MBGP, defined in IETF RFC 2858, is an extension to the Border Gateway Protocol unicast routing protocol that allows different types of addresses (known as address families) to be distributed in parallel. This allows information about the topology of Internet Protocol multicast-capable routers to be exchanged separately from the topology of normal Internet Protocol version 4 unicast routers. Hence, it allows a different multicast routing topology from the unicast routing topology. Although MBGP enables the exchange of inter-domain multicast routing information, other protocols such as the Protocol Independent Multicast family are needed to build trees and forward multicast traffic.

Protocol Independent Multicast-Sparse Mode (PIM-SIM) and Rendezvous Point (RP)

PIM-SIM is a protocol for efficiently routing to multicast groups that may span wide-area (and inter-domain) internet. PREGINET RP is 202.90.130.17.

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