Chapter 26 Troubleshooting; Avoiding Configuration Conflicts - Cisco Catalyst 2950 Software Configuration Manual

Troubleshooting
This chapter describes how to identify and resolve software problems related to the IOS software.
Depending on the nature of the problem, you can use the command-line interface (CLI) or the Cluster
Management Suite (CMS) to identify and solve problems. To identify and resolve Cisco-approved
Course Wave Division Multiplexer (CWDM) Gigabit Interface Converter (GBIC) problems, you must
have the enhanced software image installed on your switch.
Note For complete syntax and usage information for the commands used in this chapter, refer to the
Catalyst 2950 Desktop Switch Command Reference for this release and the Cisco IOS Command
Summary for Release 12.1.
This chapter consists of these sections:
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For additional troubleshooting information, refer to the switch hardware installation guide.

Avoiding Configuration Conflicts

Certain combinations of port features conflict with one another. For example, if you define a port as the
network port for a VLAN, all unknown unicast and multicast traffic is flooded to the port. You could not
enable port security on the network port because a secure port limits the traffic allowed on it.
In Table
means that both can be enabled at the same time and will not cause an incompatibility conflict.
If you try to enable incompatible features by using CMS, it issues a warning message that you are
configuring a setting that is incompatible with another setting, and the switch does not save the change.
78-11380-04
Avoiding Configuration Conflicts, page 26-1
Avoiding Autonegotiation Mismatches, page 26-2
GBIC Security and Identification, page 26-2
Troubleshooting CMS Sessions, page 26-3
Copying Configuration Files to Troubleshoot Configuration Problems, page 26-4
Using Recovery Procedures, page 26-5
Using Debug Commands, page 26-11
26-1, no means that the two features are incompatible, and that both should not be enabled; yes
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Catalyst 2950 Desktop Switch Software Configuration Guide
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26-1