Cabletron Systems STS16-20R manual Built-in Port Counters, Stackable Architecture, Back-to-Back

39

Built-in Port Counters

The SmartStack STS16-20D/STS16-20R supports a wide range of port counters, which enables you to obtain a detailed overview of the port traffic. The counters give a comprehensive overview in the areas of:

•

•

•

MAC Layer Counters

MAC Layer Error Counters

Frame Forwarding Counters

Stackable Architecture

All SmartStack STS16-20x switches are stackable.

SmartStack STS16-20D/STS16-20R switches can be stacked using the included SmartStack STS-LM Link Module, the optional SmartStack STS-5SU Stacker Unit or the optional SmartStack STS-8SU Stacker Unit for connecting up to eight switches in a stack.

The STS-LM Stacker Link Module is a built-in feature of the SmartStack STS16- 20D and SmartStack STS16-20R Switches, the other two stacker units are optional. The following sections describe how to stack the STS16-20x switches.

Back-to-Back

Two STS16-20x units can be connected together by fitting each switch with the SmartStack STS-LM Link Module and connecting the switches together using and appropriate stacker link cable. This simple connection doubles the number of ports available.

Internal Stacker

The STS-5SU Internal Stacker Unit can be inserted into the stacker port of a switch. It allows up to five switches from the SmartStack STS16-20RM switch family to be stacked together. One of the switches in the stack must contain the STS-5SU Internal Stacker Unit. The other switches in the stack must be equipped with a STS- LM Stacker Link Module and an appropriate stacker link cable. This can result in a stack of as many as five STS16-20x switches. The STS-5SU Internal Stacker Unit works as a common backplane switching fabric, which provides 1.4 Gbps of aggregate bandwidth.

External Stacker

The SmartStack STS-8SU External Stacker Unit is an external stack unit that allows up to eight STS16-20x switches to be stacked together. Each switch in the

Switch Overview SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide