MD5 authentication is a cryptographic authentication. A key (password) and key-id are configured on each router. The router uses an algorithm based on the OSPF packet, the key, and the key-id to generate a "MD5" that gets appended to the packet. Unli...
http://www.ebrahma.com/2013/11/configuringverifying-troubleshooting-md5-authentication/Labels: Configuring, Configuring-MD5-Authentication, Troubleshooting-MD5-Authentication, Verifying-