This definition identifies the characteristics of a network node that is operating as a single installation (for the purposes of networking). Typically, a SITE definition is provided for each ACF/VTAM Domain that is operating a Network Director. The SITE definition provides a name for, and a path to the other domain.
The SITE definition is utilized to define a path between multiple Network Director's. Each Network Director can then communicate with the other via the defined path. This is used for several purposes. An example would be the transmission of a message created via the Message Facility intended for a network user located at a different "site" within the computer network.
The SITE definition should also be utilized to improve security amongst multiple nodes by causing Network Director to guarantee that a user transferring from one node to another is still attending the terminal when it returns to the initial node. This is accomplished by proper use of the ACQUIRE=SELECT and ATTRIBUTES=NO-ACQUIRE definition statements and the terminal operator's RETURN command. See RETURN Command for additional information.
The format of the SITE statement is:
SITE
site name
[ NETWORK-ELEMENTS=(alpha pattern, ... ) ]
TARGET=alpha value
|
is the 1 to 8 character identifier for the SITE being defined. This will be used externally to refer to the SITE and is the name that will be entered on the Message Editor's panel to indicate where a particular message should be sent.
identifies the network element values (typically, USERS or TERMINALS definitions that are located at the SITE being defined. This operand provides a mechanism to cause Network Director to enforce "naming standards" for what destinations are located at the SITE. The value entered by a Message Editor user into the To: field must match at least one of the operands present on this operand or it will be rejected. Wild characters are valid.
If the "site name" matches the GLOBALS SITE= value, then Network Director will assume that the SITE you are defining is itself. In this case, the NETWORK-ELEMENTS operand controls which destinations in this Network Director can receive messages (although actual Sent messages will not go through the LU-LU type logic).
is the VTAM APPLID that can be utilized in LU-LU operations for this Network Director to contact the other Network Director.
SITE SEATTLE,TARGET=DIRECTOR,
NETWORK-ELEMENTS=(Z+++++++,LU++++++)
|
This SITE definition establishes that the SEATTLE data center has Network Director operating under the ACF/VTAM APPLID of DIRECTOR and the valid destinations at that data center for messages must have a User Id or LU Name starting with a Z or a LU character string.