This is the first post in a series about routing protocol EIGRP. Today we will deep dive into how metric is calculated in EIGRP classic mode.
EIGRP is a distance-vector routing protocol, but what does it really mean? How does a distance-vector routing protocol differ from link-state? Distance-vector is also referred to as “routing by rumor”. It means that a router makes its decision based on the metrics reported by his neighbors.
This is unlike a link-state routing protocol where every router in an area (OSPF) or level (IS-IS) knows the whole topology for this area/level and calculates the best path locally using the shortest-path algorithm (Dijkstra). Because routers have the same information, it results in a consistent choice of the best path.
My name is Dmitry Figol. Currently I am a customer support engineer in Cisco TAC in Krakow. I enjoy networking a lot and I have CCIE R&S. On top of that I am Python and network programmability enthusiast. More information about me as well as contact details you can find on the About page.
I’ve finally decided to start a blog to document and share some interesting findings. I am using Jekyll static site generator and so far I enjoy the workflow. All of the content is written in Markdown, which is super easy to work with.
This is my first post so expect things to change around here quite a lot, especially during the first month. Some links may be broken as well, but only temporarily.
Thanks for visiting my blog and I hope you will enjoy the content!