What is EIGRP Protocol ?
Prologue to EIGRP
In this illustration, we'll investigate EIGRP (Enhanced Interior Gateway Routing Protocol) which is Cisco's directing convention. Assuming that you are new to remove vector and RIP I energetically prescribe to peruse my Introduction to RIP first prior to proceeding.
EIGRP represents Enhanced Interior Gateway Routing Protocol and is a steering convention made by Cisco. Initially, it was just accessible on Cisco equipment however since a couple of years, it's currently an open norm. EIGRP is known as a crossover or high level distance vector convention and the vast majority of the guidelines that apply to RIP likewise apply here:
Part Horizon
Course Poisoning
Poison Reverse
EIGRP Tables
EIGRP switches will begin sending hi parcels to different switches very much like OSPF does, assuming that you send hi bundles and you get them you will become neighbors. EIGRP neighbors will trade directing data which will be saved in the geography table. The best way from the geography table will be duplicated in the steering table.
Choosing the best way with EIGRP works a piece not quite the same as other steering conventions so we should see it in real life:
eigrp demo 3 switches
We have three switches named R1, R2 and R3. We will ascertain the best way to the objective which is behind R3.
EIGRP utilizes a rich arrangement of measurements to be specific data transmission, postponement, burden and dependability which we will cover later. These qualities will be placed into an equation and each connection will be doled out a measurement. The lower these measurements the better.
In the image above I have doled out certain qualities on the connection points, on the off chance that you would look on a genuine EIGRP switch you'll see the numbers are exceptionally high and a piece irritating to work with.
eigrp promoted distance
R3 will promote to R2 its measurement towards the objective. Fundamentally R3 is sharing with R2: "It costs me 5 to arrive". This is known as the promoted distance. R2 has a geography table and in this geography table it will save this measurement, the publicized distance to arrive at this objective is 5.
The publicized distance is additionally called the revealed distance.
eigrp attainable distance
We are not finished at this point since there is something different that R2 will save in its geography table. We realize the publicized distance is 5 since this is everything that R3 said to us. We additionally know the measurement of the connection somewhere in the range of R2 and R3 since this is straightforwardly associated. R2 currently knows the measurement for the all out way to the objective, this complete way is known as the plausible distance and it will be saved in the geography table.
You have now learned two significant ideas of EIGRP. The promoted distance, your neighbor lets you know how far it is for him to arrive at the objective and the plausible distance which is your absolute distance to get to the objective.
How about we proceed!
eigrp publicized achievable distance
We are not finished at this point since R1 is likewise running EIGRP. R2 is sending its achievable distance towards R1 which is 15. R1 will save this data in the geography table as the publicized distance. R2 is "telling" R1 the distance is 15.
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CCNA Networking