How to configure MD5 authentication for BGP

Cisco How-To Tutorials
Border Gateway Protocol (BGP) supports authentication mechanism using the Message Digest 5 (MD5) algorithm. When authentication is enabled, any Transmission Control Protocol (TCP) segment belonging to BGP exchanged between the peers is verified and accepted only if authentication is successful. For authentication to be successful, both the peers must be configured with the same password. If authentication fails, the BGP neighbor relationship is not being established. To enable MD5 authentication for BGP, issue the neighbor {ip-address | peer-group-name} password string command under the BGP router configuration mode. For more information about BGP authentication with an example refer to: Configuring BGP

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