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Troubleshooting SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
10. Troubleshooting
This chapter contains procedures that help you troubleshoot problems with a switch
and its connections to other devices.
Obtaining Service
There are no serviceable parts inside the SmartStack STS16-20D/Sys16-20R. Do
not remove the cover for any reason. If you think your switch requires service,
please contact Cabletron Systems Technical Support. Please refer to Chapter 11,
“Getting in Touch with Technical Support” for instructions.
Troubleshooting in a Network
The switch console and SNMP management agent give you access to important
statistics and other information about the network, as seen by the switch. (See
Chapter 7, “Monitoring the Network from the Console Statistics Menu”).
The section “Port Statistics Menu” on page 162 can be helpful in isolating network
level problems.
The Switched Port Analyzer feature allows a network analyzer to be attached to a
port on the switch to monitor, in real time, switch activity of another port. See
Chapter 9, “Monitoring Port Traffic” for information on configuring Switched Port
Analyzer.
Start of Troubleshooting Process
If one or more devices (such as PCs) connected to a switch are unable to
communicate with other devices in the network, use the following steps to start the
troubleshooting process:
1. Locate the switch to which the device is connected. Use the network sketch, the
label on the cable connected to the device, or other network records to help you
locate the switch.
2. If you have set up a console session (see Chapter 5, “Accessing Switch
Management”), it can be used to determine whether diagnostics have been
completed correctly. A list of normal diagnostic messages is shown on page 73.
3. Observe the LEDs on the switch front panel. Figure 2 on page 5 illustrates the
LEDs. For explanations of the LEDs, see the section “Status and Activity
LEDs” on page 7. Review this section before proceeding with the
troubleshooting process.