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Routing & Switching · Intermediate

EIGRP Authentication

MD5 or HMAC-SHA-256 authentication of EIGRP packets using key chains (MD5) or named-mode passwords.

Definition

Classic mode supports MD5 with key chains; named mode adds HMAC-SHA-256 configured under af-interface. Both sides must use the same mode, key ID and string.

Example

authentication mode hmac-sha-256 Secret123 under af-interface

Exam tip

HMAC-SHA-256 is only available in named mode.

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