CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

Controlling Neighborships with Static Configuration

EIGRP supports the ability to statically define neighbors instead of dynamically discovering neighbors.

Although seldom used, you can use this feature to reduce the overhead associated with EIGRP multicast messages. Frame Relay WANs in particular might benefit from the static neighbor definitions, because to support multicasts and broadcasts over Frame Relay, a router must replicate a frame and send a copy over every PVC associated with the interface or subinterface. For example, if a multipoint subinterface has ten PVCs associated with it, but only two of the remote routers used EIGRP, without static neighbors, all ten routers would be sent a copy of the EIGRP multicast Hello packets. With ...