As per the EIGRP Authentication steps:
Key chain configuration steps:
A) First we need to configure key chain in global configuration mode.
B) Under key chain we need to configure key number. Key number must be match on both side of router and should be active. If multiple key numbers configure on router, then router select lowest number for authentication.
C) Once you configure key number you need to issue authentication string.
Suppose if have a key chain have two key identifiers in R1 and in R2 like below ..will it work ?
R1 - Key chain one
and in R2 - Key chain two
And also what is use / need for more than one key identifier in a key chain ..how eigrp will process this