4. Diameter AVPs

Diameter AVPs carry specific authentication, accounting, authorization, and routing information as well as configuration details for the request and reply.

Each AVP of type OctetString MUST be padded to align on a 32-bit boundary, while other AVP types align naturally. A number of zero-valued bytes are added to the end of the AVP Data field until a word boundary is reached. The length of the padding is not reflected in the AVP Length field.