Appendix A Troubleshooting
Isolating Problems
Troubleshooting Modules, Cables, and Connections
Network problems can be caused by a module; cables or cable connections; or external devices such as a modem, transceiver, hub, wall jack, WAN interface, or terminal. Check for the following symptoms to help isolate the problem:
Tip All the documents mentioned in this section are available both on the Documentation
•Module is not recognized by the router.
–Make sure that the module is firmly seated in its slot.
–Check the LEDs on the module. Each module has its own set of LEDs. For information on these LEDs, refer to the online publication Cisco Network Modules Installation Guide.
–Make sure that you have a version of Cisco IOS software that supports the network module. Check the Cisco Network Modules Installation Guide or accompanying configuration note for the affected module’s software requirements.
•Module is recognized, but interface ports do not initialize.
–Make sure that the module and interface card are firmly seated in their slots.
–Check external cable connections.
–Make sure that you have a version of Cisco IOS software that supports the network module and interface card. Check the Cisco Network Modules Installation Guide and the Cisco Interface Cards Installation Guide or accompanying configuration notes for the affected network module’s and interface card’s software requirements.
•Router does not boot properly, or constantly or intermittently reboots.
–Make sure that all modules are firmly seated in their slots.
–Check the router chassis or software. Refer to the warranty information in the quick start guide that shipped with your router, or contact customer service.
•Router boots, but the console screen is frozen.
–Check the external console connection.
–Verify that the parameters for your terminal are set as follows:
(a)The same data rate as configured for the router (9600 bps is the default)
(b)8 data bits
(c)No parity generated or checked
(d)1 stop bit
•Router powers on and boots only when a particular module is removed.
–Check the module. Refer to the warranty information in the quick start guide that shipped with your router, or contact customer service.
•Router powers on and boots only when a particular cable is disconnected.
–There may be a problem with the module or cable. Refer to the warranty information in the quick start guide that shipped with your router, or contact customer service.
Cisco 2600 Series Routers Hardware Installation Guide
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