Activating links

The same-domain link between NCP1 and NCP2 in Figure 1 is made available through the activation of LINK1 and LINKSTA1 by HOST1. This link and link station can be:

Directly or indirectly activated. (For example, you can enter specific VARY ACT commands for LINK1 and LINKSTA1, or LINK1 and LINKSTA1 can be defined to be initially active in NCP1 definition statements.)
Automatically activated when NCP2 is activated (by specifying LINKSTA1 on the RNAME operand of the VARY ACT command or on the RNAME operand in the PCCU definition statement for NCP2).

Note that in Figure 1, the activation of LINK2 and LINKSTA2 by HOST1 has no effect on the availability of the link between NCP1 and NCP2. The activation of LINK2 and LINKSTA2, which is required to make the link itself available, must occur by SDLC monitor mode being specified for LINK2 in NCP2 definition, or by HOST2 activating NCP2, LINK2, and LINKSTA2. If LINK2 and LINKSTA2 are activated by HOST1, HOST1 VTAM® does not deactivate them when NCP2 is deactivated. In this case, VTAM loses its ownership of LINK2 and LINKSTA2 within NCP2 by virtue of the deactivation command sent to NCP2 itself.