Enhanced addressing for session managers

To further extend enhanced host element addressing, applications that are activated within an application program major node can be assigned a high-order base address. When an LU-LU session begins for the application, the addressing capabilities of the partner LUs are assessed. If either partner does not permit use of a high-order address, a low-order auxiliary address is used.

The extent to which high-order addresses are used is determined by the parallel session capability of the application and the type of host that the application belongs to.

If the host is not pure APPN (in other words, supports subarea), applications that are not parallel session-capable will be assigned a high-order address when the application major node is activated and a low-order address is acquired when an LU-LU session involving the application requires a low-order address.

Note: Session manager applications are not typically parallel session capable.

If the host is pure APPN, all application addresses will be high-order addresses regardless of its parallel session capability.

This enhancement increases the number of addresses available for sessions and reduces the instance of sessions failing because of insufficient network addresses.