On the Interfaces & Routing > Dynamic Routing (OSPF) > Message Digests tab so-called message digest keys can be generated. Message digest keys are needed to enable MD5 authentication with OSPF. MD5 authentication uses the password to generate a message digest, which is a 128-bit checksum of the data packet and password. The message digest is sent with the data packet along with a key ID associated with the password.
Note – The receiving routers must be configured with an identical message digest key.
To create a message digest key, proceed as follows:
On the Message Digest tab, click New Message Digest Key.
The Add Message Digest Key dialog box opens.
Make the following settings:
ID: Enter the key identifier for this message digest key; the range is from 1 to 255.
MD5-key: Enter the associated password, which must be a string of up to 16 alphanumeric characters.
The new key appears on the Message Digests list.
To either edit or delete a digest key, click the corresponding buttons.