APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

86 Chapter4

APPC Subsystem Conﬁguration

Conﬁguring the APPC Subsystem

If parallel sessions are disabled (Parallel Sessions =

N), the Maximum Number of Sessions value must be 1.

If parallel sessions are enabled (Parallel Sessions =

Y), the following restrictions apply to the Maximum

Number of Sessions value:

1. The maximum number of simultaneously active

sessions for an independent session type is 256.

2. The maximum number of simultaneously active

sessions for the whole APPC subsystem is 256.

3. Maximum Number of Sessions must be greater

than or equal to the Automatically Activated

Sessions value

If parallel sessions are enabled, the Maximum Number

of Sessions value might be negotiated at session

activation time.

Default: 8

Automatically Activated Sessions

Required. The number of sessions that will be

activated automatically when the APPCCONTROL

START command is issued or the APPCStart intrinsic

is called. The Automatically Activated Sessions

value must be less than or equal to the value in the

Maximum Number of Sessions ﬁeld. The sum of the

Automatically Activated Sessions values for all

the session types on the APPC subsystem must not

exceed 256.

Default: 0

Figure 4-8 shows possible and impossible conﬁgurations for

independent LUs on the HP 3000. The dotted lines in Figure 4-8

represent APPC sessions.

Possible conﬁgurations: An independent LU on the HP 3000 can

communicate with multiple remote independent LUs, as long as all the

routes to the remote LUs pass through the same PSI card (the same

copy of SNA/SDLC Link/XL) on the HP 3000. The remote LUs can be on

the same node, or they can be on nodes connected to a Network Node

that is directly connected to the HP 3000.

Impossible conﬁgurations: An independent LU on the HP 3000

cannot communicate with multiple remote independent LUs if they are

connected to the HP 3000 through different SNA nodes (different PSI

cards). To communicate with multiple remote LUs that are connected to

the HP 3000 through different PSI cards, you must conﬁgure different

independent LUs on the HP 3000.