5.4 ip authentication mode eigrp 10 md5
To specify the type of authentication, this command is necessary.
But, come to think of it.
In EIGRP, there is no authentication except for MD5.
Plain text is out of question.
Then, why is this command necessary?
ip authentication key-chain eigrp 10 MD5_KEYS
is good enough to peceive both AS number and key-chain.
Or just a legacy of RIP’s authentication?