I need someone here to assure me that I'm not going crazy or that I got this totally wrong. Either way it'll help me. =)
"K values that are set to nonzero values are used to calculate the EIGRP metric, and K values that are set to 0 are not used..."
Q: Which of the following metrics are used by RouterB to calculate the EIGRP composite metric?
k1=0 k2=1 k3=0 k4=0 k5=0
In my understanding... k2/load would be the correct answer.
The only "nonzero value" is K2/load so my question is... How can the exam environment request me to select bandwidth/k1 and load/k2 in order to be correct?
Can anyone expand on that please? Have I missed anything here? I know these are the non default values, but will bandwidth/k1 be used even though k1 is set to 0? I wouldn't think so.
K values are only multipliers.
So in this case the EIGRP metric which formula is:
EIGRP Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + K3*Delay)*(K5/(Reliability + K4)))
will be 256*((0*Bw)+ (1*Bw/(256-Load)+ 0*Delay)= (Bw/(256-Load))* 256
We are using the Bandwidth and the Load
Thanks for your reply. I think the keyword I was missing is "multipliers".
In that case, is it save for me to say that "Bandwidth is always used regardless of its K-value multiplier. However, the cannot be said about Delay." Is that correct?
K1 -bandwidth and K3- delay are 1; others 0;
and by default, routers use K1 and K3 =1; other 0
you change that with command
metric weights tos K1 K2 K3 K4 K5
metric weights 0 1 0 1 0 0
I wouldn't say "always" used. Only if K1 or K2 is set to a non-zero number would bandwidth be used.
The other K values correspond to parts of the equation that do not at all involve bandwidth.
Thanks everyone. I think this is important to keep in mind as it can be easily overlooked. Well at least I did.
A quick summary based on what's been said here would be:
- K-values are multipliers
- Default is k1=1 k2=0 k3=1 k4=0 k5=0
- If K2/Load is set to a non-zero value, bandwidth is also used