Envoy Configuration and Management Manual

Subsystem Control Facility (SCF) for Envoy

Envoy Configuration and Management Manual—429861-001

4-3

Changing a LINE Object

You can change line attributes by issuing SCF commands directly to the Envoy

subsystem. These changes persist until you stop the DEVICE (in the WAN subsystem)

associated with the line, until after a system load or processor reload, or until an

application procedure call overrides the attributes.

The following example shows how to change a line’s attributes directly through the

Envoy subsystem:

> SCF

-> ALTER LINE $ENV01, BSCPTP DTR ON

Starting a LINE Object

To start the line after you have changed it, issue the SCF START command to the Envoy

subsystem as in the following example:

> SCF

-> START LINE $ENV01

DSM and SCF Basics

This subsection gives you a brief introduction to Distributed Systems Management

(DSM) and to SCF. If you need more information than is provided here, see DSM/SCM

User’s Guide. If you are already familiar with DSM and SCF, you can proceed to

Objects for Envoy

on page 4-6.

The DSM product supports integrated management of system and network resources and

operations. DSM architecture consists of the following:

•

An operations environment providing applications and tools for operations tasks and

for controlling the subsystems

•

A subsystem environment in which subsystems (such as Envoy) and the objects they

control are managed (by the tools and applications in the operations environment)

•

A set of management services that support the programmatic interface between the

subsystem and operations environments

Subsystem Control Process (SCP)

As Figure 4-1 shows, SCF communicates with subsystems through the Subsystem

Control Process (SCP). SCP is an intermediate process that receives commands from

SCF and distributes them to subsystems. The default SCP process name is $ZNET.

The Subsystem Programmatic Interface (SPI) controls the programmatic

communications. SPI builds and retrieves information from command, response, and

event-message buffers.

SCP and SCF can reside on different Compaq nodes but these nodes must be connected.

SCP and the Envoy process must reside on the same Compaq node.