EIGRP makes use of a composite metric and Ok-values to calculate the popular path to a vacation spot.
EIGRP Ok Values Sorts –
Under desk particulars on the 5 Ok-value varieties and corresponding default Cisco worth on units whereas calculating EIGRP metric to a vacation spot.
Associated – EIGRP Interview Questions
EIGRP okay values metric calculation –
The system for the computation of EIGRP metric is –
EIGRP metric = [K1 * bandwidth + (K2 * bandwidth) / (256 – load) + K3 * delay] * [K5 / (reliability + K4)]
It’s essential to grasp the place to search out the EIGRP okay values within the Cisco community units. The command “present interfaces (interface title)” will present the element of all of the Ok-values i.e. Bandwidth, Load, delay, Reliability and MTU.
One other essential present command to indicate the Ok values presently used the cisco machine (default values) –
“Present ip protocols”
Now, let’s perceive from an instance situation which can illustrate how EIGRP composite metric is calculated for Community 1.1.1.0/24 (Loopback 0 of Router R1). Routers R1, R2 and R3 are all linked in collection with Loopback 0 of R1 (IP =1.1.1.1/24) marketed in EIGRP area. We’re contemplating default Ok-values calculation mechanism i.e. K1 = K3 = 1 and K2=K4=K5 = 0.
Associated Bl0g – Configuring EIGRP Stub FEATURE
Computation system –
Metric for community 1.1.1.0/24 = 256 * (10^7/BW in Kbps) + 256 * (Sum of delay in Micro sec/10)
On Router R1, since Loopback 0 (1.1.1.0/24) is instantly linked, therefore the metric comes out to be 0. Now let’s see how R2 interprets metric for reaching Loopback 0 of R1 –
As above, the minimal bandwidth can be determined from one of many 2 i.e. (1) Loopback 0 of R1 (2) Interface fa0/0 of R2. For computation, bandwidth of 10000 Kbps of R2 interface Fa0/0 can be used because it’s the minimal of the two.
For Delay calculation, sum of each the (1) Loopback 0 of R1 and (2) Interface Fa0/0 of R2 can be taken. Therefore whole Delay (in microsec ) comes out to be 5000 + 1000 = 6000 Microseconds.
The ultimate computation of metric for R2 to achieve Loopback 0 of R1 involves be 49600.Now let’s perceive how R3 computes the Metric to achieve Loopback 0 of R1.
As above, the minimal bandwidth calculation can be taken from one the three interface bandwidths (1) Loopback 0 of R1 (2)Interface Fa0/0 of R2 (3) Interface Fa0/1 of R3
For the reason that minimal bandwidth is 10000 Kbps on Fa0/0 of R2 and Fa0/1 of R3, the identical can be utilized in computation as proven in above diagram.
For Delay calculation, once more sum of following interfaces can be thought-about – (1) Loopback 0 of R1 and (2) Interface Fa0/0 of R2 (3) Interface Fa0/1 of R3. Therefore whole Delay (in microsec) comes out to be 5000 + 1000 + 1000= 7000 Microseconds.
Now we now have clear understanding of EIGRP composite metric is calculated by Ok values. Within the above case the default values of K1 and K3 have been used whereas calculating the composite metric for the vacation spot.