cisco eigrp authentication key-string

We just adquired a new router (cisco 2900 series) to replace another router (Router 1). In router 1 we have eigrp authentication with a key-string encrypted (i.e 7 15005b19107939) because the vendor router uses eigrp authentication. Router 1 is connected to this vendor router. My question is do i need to get the key-string word that they used in their router or can we  just generate our  own key-string when we setup the new router.
ShenAsked:
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ffleismaSenior Network EngineerCommented:
you need to match the key string for the peer router.

you can try using the following command and see if shows the current encrypted key

more system:running-config

if it doesnt you'll need to ask your peer or the current peer key or replace both sides with a new key
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ShenAuthor Commented:
Thnak you
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