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EIGRP (Enhanced IGRP) has replaced IGRP. With the way EIGRP is set up as a protocol it is possible to implement a newer router that only supports EIGRP into a network that is running IGRP. Honestly network admins should be pushing for EIGRP if they are still on IGRP as for many features and advantages EIGRP has over IGRP.

Directly from Cisco.com:

"Enhanced IGRP provides compatibility and seamless interoperation with IGRP routers. An automatic-redistribution mechanism allows IGRP routes to be imported into Enhanced IGRP, and vice versa, so it is possible to add Enhanced IGRP gradually into an existing IGRP network."

EIGRP:Enhanced Interior Gateway Routing Protocol

IGRP: Interior Gateway Routing Protocol

*IGRP and EIGRP are both Cisco proprietary routing protocols.

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