MNS-BB Software User Guide
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23.0 Troubleshooting
23.1 Overview
This chapter addresses performance-related network problems that can be caused by topology, Switch
configuration, and the effects of other devices or their configurations on Switch operation. (For Switch-
specific information on hardware problems indicated by LED behavior, cabling requirements, and other
potential hardware-related problems, refer to the LE2425A / LEV2525A Switches User Manual.)
This chapter includes:
• Troubleshooting Approaches
• Console Interface Problems
• Unusual Network Activity
• General Problems
• VLAN-Related Problems
• Using the Event Log To Identify Problem Sources
• Diagnostics and Management Tools, including:
• Ping test
• Command prompt
• Restoring the factory default configuration
For information on support and warranty provisions, see the LE2425A / LEV2525A Switches User Manual
23.2 Troubleshooting Approaches
Use these approaches to diagnose Switch problems:
• Check the Switch LEDs for indications of proper Switch operation:
• Each Switch port has a Link LED that should light whenever an active network
device is connected to the port.
See the Hardware User Guide shipped with the Switch for a description of the LED behavior and
information on using the LEDs for trouble-shooting.
• Check the network topology/installation. See the Hardware User Guide shipped
with the
Switch for topology information.
• Check cables for visible damage, correct type, and proper connections. See the
Hardware User Guide shipped with the Switch for correct cable types and
connector
pin-outs.
• For help in isolating problems, use the easy-to-access console port built into the
Switch. See chapter 2, “Using the Console Interface” for operating information.
These tools are available through the console port.
• Status and Counters screens
• Event Log
• Diagnostics tools (Ping test, and advanced user commands)
23.3 Console Access Problems
The Switch may not have the correct IP address, subnet mask, or gateway. Verify the problem by
connecting a console to the Switch’s Console port and check the IP configuration.
23.4 Unusual Network Activity
Network activity that exceeds accepted norms may indicate a hardware problem with one or more of
the network components, possibly including the Switch. Unusual network activity is indicated by the
light patterns of the LEDs on the front of the Switch. This unusual activity can be measured with the
Switch console interface or with a network management tool. Refer to the Hardware User Guide you
received with the Switch for information on using LEDs to identify unusual network activity.
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