EIGRP Issues on Multipoint and Physical Interfaces


The best time to read this section is when reading Chapter 14, “Implementing Frame Relay,” after the similar heading about OSPF issues over Frame Relay.

Chapter 14 discusses some problems with OSPF when operating over Frame Relay physical and point-to-multipoint interfaces. This topic discusses some different problems that EIGRP has on these same types of interfaces. The problems revolve around the fact that these types of interfaces connect the router to multiple other routers over the same subnet. As a result, the EIGRP Split Horizon feature has some effects on the operation of EIGRP.

To review, Split Horizon causes a router to advertise a subset of its known routes rather than all ...

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