This post will delve in to the fundamentals of EIGRP for CCNP ROUTE studies.
There are 2 types of routing protocols:
1. Link State
2. Distance Vector
EIGRP is considered a hybrid protocol. It has characteristics of both link state and distance vector. It behaves like a distance vector protocol because it exchanges the entire routing table with neighbors initially. Beyond that, it behaves much more like a link state protocol (only changed routes are sent after a topology change). It is also Cisco proprietary, which is a problem for inter-operability.
EIGRP relies on multicasting (hello packets) to 188.8.131.52 and uses RTP (reliable transport protocol) to handle the transport of messages between routers.
EIGRP supports multiple routed protocols: IP, IPX, and AppleTalk
Some basic rules when configuring EIGRP
- An autonomous system number is used, and only routers with the same ASN will exchange routes (become neighbors).
- IOS enables only EIGRP on interfaces…
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