CHAPTER 20
Troubleshooting Cisco 800 Series Routers
Use the information in this chapter to help isolate problems you might encounter or to rule out the router as
the source of a problem.
•
Getting Started, page 365
•
Before Contacting Cisco or Your Reseller, page 365
•
ADSL Troubleshooting, page 366
•
SHDSL Troubleshooting, page 366
•
VDSL2 Troubleshooting, page 367
•
show interfaces Troubleshooting Command, page 367
•
ATM Troubleshooting Commands, page 369
•
Software Upgrade Methods, page 374
•
Recovering a Lost Password, page 374
•
Cisco Configuration Professional Express, page 379
Getting Started
Before troubleshooting a software problem, you must connect a terminal or PC to the router by using the
light-blue console port. (For information on making this connection, see the documentation listed in the Related
Documentation.) With a connected terminal or PC, you can view status messages from the router and enter
commands to troubleshoot a problem.
You can also remotely access the interface (Ethernet, ADSL, or telephone) by using Telnet. The Telnet option
assumes that the interface is up and running.
Before Contacting Cisco or Your Reseller
If you cannot locate the source of a problem, contact your local reseller for advice. Before you call, you should
have the following information ready:
Cisco 800 Series Integrated Services Routers Software Configuration Guide
OL-31704-02 365
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