Refer to the exhibit. R1 and R2 are configured for EIGRP peering using authentication and the neighbors failed to come up. Which action resolves the issue?
A.
Configure a matching lowest key-id on both routers.
B.
Configure a matching authentication type on both routers.
C.
Configure a matching key-id number on both routers.
D.
Configure a matching key-chain name on both routers.
For me it's "A". The lowest key ID needs to match, because EIGRP checks against the FIRST valid key. Good sources from you guys:
https://community.cisco.com/t5/routing/eigrp-authentication-problem-need-your-help/td-p/1714446
https://community.cisco.com/t5/switching/key-chain-validation-for-eigrp/td-p/1988487
If you have several keys under the same key chain, then lowest key ID needs to match. If you have only one key under the key chain, then key-id must match on both routers. In this question, router 2 shows 2 keys, so the answer is "A".
The EIGRP try to use the key-id in the order they were configured. In this exemplo they will never match and there is no way to chance the order EIGRP process the keys.
C seeems more correct for me.
A is the answer, matching the lowest key-ids on both routers.
https://community.cisco.com/t5/routing/eigrp-authentication-problem-need-your-help/td-p/1714446
I reviewed our production environment and there are matching keys.
key chain "example"
key 170
key-string "password"
accept-lifetime 10:00:00 Feb 3 2020 infinite
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