Troubleshooting guide

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
Enable debugging on the router.3.
Router#debug atm events
ATM events debugging is on
Router#
2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EF74 length=52
2d18h: Data Cell received on vpi = 8 vci = 35
!−−− Your VPI/VCI.
2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EEC0 length=52
2d18h: Data Cell received on vpi = 8 vci = 35
2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EECC length=52
2d18h: Data Cell received on vpi = 8 vci = 35
2d18h:
Cisco DSL Router Configuration and Troubleshooting Guide