Key chain is individual concept, Key string common?
Judging from my task experience, I began to think the above.
In Task 5.4 EIGRP, BB1 and R6 are going to make authentication.
Key chain EIGRP
Key chain MD5_KEYS
They authenticated with each other.
Key-string must be identical.
CISCO must be CISCO.
‘CISCO ‘ will not be allowed.
However, Key chain name does not need to be identical.