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Poison Reverse is a feature in distance-vector routing to avoid problems encountered in routing loops. That is, when a route goes down, the router “poisons” subsequent by marking these routes as unreachable.

An application of split-horizon is called MFO [Multicast Fan Out], where the server sends a unicast TCP [Transmission Control Protocol] message. Integrated multiprotocol routing adds features (separate route lists/tables and procedures) for different routing protocols. The MFO receiver/server converts back to unicast TCP packets for client access.

MFO server converts unicast TCP into a PIM [Protocol Independent Multicast] or others. For example, EIGRP [Enhanced Gateway Routing Protocol] and interior or internal routing protocol can support routing tables for TCP/IP, IPX/SPX, and others. That is, a separate routing list is created for each protocol but using only one routing protocol.

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[tags]pim,tcp,mfo,multicast fan out,poison reverse,protocol independent multicast[/tags]