Cisco certification candidates are introduced to BGP in the CCNP level, however, the response to its debut consistently reminds me of something that I visit frequently as the CCNA level. More info https://www.itexamsuccess.com/
Whenever I instruct distance-vector protocols in my Ultimate CCNA Boot Camp or Fast Track courses, I’m sure my students understand the numerous rules of distance-vector routing entirely. We proceed on to link-state routing and OSPF.
And what can I inform my students before we proceed to OSPF and link-state? “Take all that fantastic things you simply learned about distance-vector routing and place it aside, because none of it applies here”
That is about the time that I get amazed looks and a couple of things thrown at me. :-RRB-
What is this got to do with BGP? When you get started studying BGP, then you need to place a great deal of preconceptions. It seems such as OSPF or RIP, but it is not.
So… before we begin analyzing BGP and looking at a few of its many attributes, let us take a peek at exactly what BGP is and what it is not.
What BGP Can And Who Uses It
If you are in a situation where you are utilized to viewing or working with routing protocols like EIGRP and OSPF, you are likely working with BGP. BGP is not. BGP is used to link autonomous systems, which are extremely big”collections” of programs. (Those of you who’ve researched IGRP and EIGRP are knowledgeable about the concepts of an AS.)
Rather than routing protocols like EIGRP and OSPF, BGP is an exterior routing protocol. BGP isn’t utilized to obtain a network where that network is found it is used to discover the AS.
A fantastic way to check at it’s that networks are included in Autonomous Systems BGP makes it possible to discover the AS in which a specified network is located. Routing protocols like EIGRP and OSPF take it from there.