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Installation SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
Working with a Stack
When the SmartStack STS16-20D/STS16-20R switch powers up, it runs through a
series of diagnostics. Immediately after the diagnostics are complete, the
SmartStack STS16-20D/STS16-20R enters the stack discovery mode. The
discovery mode is used to sense if the unit is cabled to other SmartStack STS16-
20D/STS16-20R units. If the SmartStack STS16-20D/STS16-20R is connected to
other units during the discovery mode, the switches automatically combine to form
a stack.
Each unit is assigned a box number, and the box with the lowest number becomes
the stackmaster. When accessing switch-specific settings from a management
console, you will be prompted for the box number. In a back-to-back configuration,
the box number is determined by software. In configurations using the SmartStack
STS-8SU or STS-5SU units, the box number is determined by the port number.
The switches in the stack combine certain configuration parameters so that the
stack as a unit uses one set of parameters. These parameters are discussed below in
“Inter-box Parameters”.
The stack can now be managed as a single entity from a management console or
management application.
Inter-box Parameters
The SmartStack STS16-20D/STS16-20R switches participating in the stack must
combine configuration information so that the stack as a whole uses common
parameters. One of the participating switches becomes the provider of inter-box
parameters.
If the switches have the same configuration information, the switch that becomes
Box 1 becomes the provider. If the configuration information is different, a split-
stack will be formed and a warning message will be displayed on the console
screen. You will be requested to briefly press the SysReq button on the switch that
is to be the provider of inter-box parameters. When you have selected the provider,
the other switch will replace its stack related configuration parameters with those
of the provider.