Title: Multipath Issues in Unicast and Multicast Next-Hop Selection
Author(s): D. Thaler, C. Hopps.
Status: INFORMATIONAL
Date: Nov 2000
Length: 17796
Various routing protocols, including Open Shortest Path First (OSPF) and Intermediate System to Intermediate System (ISIS), explicitly allow "Equal-Cost Multipath" (ECMP) routing. Some router implementations also allow equal-cost multipath usage with RIP and other routing protocols. The effect of multipath routing on a forwarder is that the forwarder potentially has several next-hops for any given destination and must use some method to choose which next- hop should be used for a given data packet.
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