(1) .-SECLVLCP--=--ADAPT-------. >>-+--------------------------+-------------------------------->< '-SECLVLCP--=--+-LEVEL1-+--' +-LEVEL2-+ '-ADAPT--'
Notes:
- The SECLVLCP start option is meaningful only if the NODETYPE and VERIFYCP start options are also used.
| dependency: | LU 6.2 sessions |
Specifies whether VTAM® uses the basic or enhanced protocol for session-level security verification during activation of an LU 6.2 session involving control points.
Some VTAMs allow only basic protocol, while others allow
basic or enhanced. VTAMs that allow both protocols fall into two classes:
- Those that allow choice of basic or enhanced protocol at any time
- Those that allow a restricted choice: after the enhanced protocol is used to a particular partner, only the enhanced protocol can be subsequently used to that partner.
- SECLVLCP=LEVEL1
- Specifies that the basic protocol is used. If a partner CP does
not support the basic protocol, VTAM rejects
the session and issues a sense code.
LEVEL1 is useful in a VTAM that is connected to an earlier version of VTAM that is using session-level security verification. LEVEL1 prevents the restricted-choice class of VTAMs from locking out subsequent sessions to the earlier version of VTAM.
- SECLVLCP=LEVEL2
- Specifies that the enhanced protocol is used. If a partner CP does not support the enhanced protocol, VTAM rejects the session and issues a sense code. LEVEL2 is useful when all communicating VTAMs have session-level security, and you want to prevent sessions being set up with the less stringent LEVEL1 protocol.
- SECLVLCP=ADAPT
- Specifies that VTAM will
negotiate whether to use the basic or enhanced protocol for LU-LU
session-level security verification, depending on the protocol supported
by the partner CP. VTAM attempts
to use the enhanced protocol but will use the basic protocol if a
partner CP does not support the enhanced protocol.
ADAPT is useful in a VTAM that communicates with those VTAMs using LEVEL1 and with the restricted-choice class of VTAMs.