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+--- Thread: AR521 (/thread-2534.html)
AR521 - chewosaurus - 08-18-2025
Not sure if this question is correct, that being said I'm not exactly an expert on the topic.
Correct answer as it stands is the answer with the K values as 0 1 1 1 0 0
But why? what's the reason for this answer, I've researched as much as I can but I still don't get why this answer was chosen to be correct.
The only answer that I can see possibly being correct is the answer with the K values 0 1 0 1 0 0
The reason why this could be correct is because this is Cisco's default values, and if the EIGRP neighborship is down due to mismatch in K values, surely the default would be a better option here?
Other than that, if you believe the current answer to be correct please enlighten me.
Thanks.
RE: AR521 - help_desk - 08-19-2025
In EIGRP, two routers will only form a neighbor adjacency if their K-values (metric weights) match. The K-values correspond to the metric calculation formula and must be identical across all peers in the same EIGRP AS. By default, Cisco uses the values "0 1 0 1 0 0" but none of the options are using these k-values. Hence, we choose which fits best.
When we configure metric weights, the first value is TOS which is always 0. Which means only two options remain.
K5 must be 0 unless K4 > 0, otherwise the reliability term can be rejected. Many IOS versions reject such combination.
This leaves us with only one correct combination "metric weights 0 1 1 1 0 0". Although these aren't default values but are the only ones correct.