EIGRP authentication missmatch after replacement new router

[Mahdi.Feiz]

Hi,

My 2811 router was crashed and i had to replace it with a new 2911. My routing protocol is EIGRP and authentication is enable. To perform replacement I copy&paste running config from my backup to new 2911's flash. Every thing is ok but the EIGRP authentication doesn't match with other routers. So the traffic is corrupted accordingly. Is there any mandatory witch I've forgotten? 

[Georg Pauwen]

Hello,

cutting and pasting probably messed up keys. I would suggest to remove all EIGRP authentication information, as well as key chains and keys manually and reenter it...

--> no key chain keychain
--> no key 1

!

interface x
--> no ip authentication mode eigrp x md5
--> no ip authentication key-chain eigrp x keychain

[Mahdi.Feiz]

thank you for responding. But as I mentioned I missed all other routers so couldn't change authentication configs(unfortunately wasn't configured management static route on the routers). I strongly want to know if is there any solution to recover EIGRP authentication from running config without reentering key chains and keys manually. (especially in case of no having the keys)

[Georg Pauwen]

Hello,

instead of cutting and pasting (which I am pretty sure messes the keys up), you better copy the running config to a TFTP server.

[paul driver]

Hello

What eigrp type is inplace traditional or named, As authenticaion differs depending on the eigrp process your using.

And as @Georg Pauwen stated it would be best to re-enter the key-chain and passwords manually to make sure no typos are being made.