The Cisco IOS modifying the dead internal automatically when the message digest 5 (MD5) internal are changed in the system. When we enabled the MD5 authentication in the Cisco by using the keyword "Message digest" then we configuring the password in the IP OSPF interface command which is known as MD5 key.
The OSPF interface is a compatible configuration in the remote interface before they considered as neighbors in the Cisco system. The MD5 are basically created by the cisco NX-OS.
