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CCNP Routing and Switching ROUTE 300-101 Official Cert Guide, Video Enhanced Edition by Kevin Wallace

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WAN Issues for EIGRP Topology Exchange

With all default settings, after you enable EIGRP on all the interfaces in an internetwork, the topology exchange process typically does not pose any problems. However, a few scenarios exist, particularly on Frame Relay, which can cause problems. This section summarizes two issues and shows the solutions.

Split Horizon Default on Frame Relay Multipoint Subinterfaces

Cisco IOS support for Frame Relay allows the configuration of IP addresses on the physical serial interface, multipoint subinterfaces, or point-to-point subinterfaces. Additionally, IP packets can be forwarded over a PVC even when the routers on the opposite ends do not have to use the same interface or subinterface type. As a result, many small ...

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