Session-level verification enables an LU to verify its partner's identity every time a session between the LU-LU pair is established. When using session-level security, each LU must have access to a session key that has been previously defined for the LU-LU pair by the network security administrator in an external security management product. Two protocols are available:

• Level 1 (also referred to as basic)
• Level 2 (also referred to as enhanced)