EIGRP Operation in an NBMA Environment and Large Networks
The Cisco EIGRP is a scalable option that provides support for point-to-point connections as well as NBMA point-to-point and multipoint links. This is another benefit of moving from IGRP to EIGRP and is a viable alternative to OSPF, depending on your environment.
As far as bandwidth is concerned, EIGRP looks at point-to-point Frame Relay interfaces just like any other serial interface and defaults to 1.544Mbps. Make sure that you configure your interfaces based on the Committed Information Rate (CIR) agreements with your vendor, corporate site, or area of your campus design.
Pure Multipoint Scenario
In a pure multipoint EIGRP WAN environment, one physical interface on the hub router is ...
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