Troubleshooting guide

Is the DSL operating−mode correct?
If everything up to this point in the Layer 1 troubleshooting procedure is correct, the next step is to make sure
you have the correct DSL operating mode. Cisco recommends using dsl operating−mode auto if you are not
sure what DMT technology your ISP is using. The commands to configure operating−mode autodetection are
as follows:
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface atm 0
Router(config−if)#dsl operating−mode auto
Router(config−if)#end
Router#write memory
Is the circuit tested/provisioned correctly?
Obtain this information from your ISP or telephone company.
Layer 2 Issues
Do you have the correct Permanent Virtual Circuit (PVC) values
(VPI/VCI)?
Complete the following steps to determine whether you have the correct virtual path identifier/virtual circuit
identifier (VPI/VCI) values configured on the router.
Verify your version of Cisco IOS® software.
Important: This will not work with Cisco IOS Software Release 12.1(1)XB.
Router#show version
!−−− Used to determine your Cisco IOS version.
Cisco Internetwork Operating System Software
IOS (tm) C820 Software (C820−OSY656I−M), Version 12.1(3)XG3,
EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
!−−− The two lines immediately preceding appear on one line on the router.
TAC:Home:SW:IOS:Specials for info
Copyright (c) 1986−2000 by cisco Systems, Inc.
Compiled Wed 20−Dec−00 16:44 by detang
Image text−base: 0x80013170, data−base: 0x80725044
<... snipped ...>
1.
Configure the router for debug logging.2.
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#logging console
Router(config)#logging buffer
Router(config)#service timestamp debug datetime msec
Router(config)#service timestamp log datetime msec
Router(config)#end
Router#write memory
Building configuration...
[OK]
Router#terminal monitor
Cisco DSL Router Configuration and Troubleshooting Guide