Troubleshooting Using Debug Commands

Command

Possible Problem

Solution

show isdn status

Improperly connected cable.

• Refer to troubleshooting information in Cisco 800

(user EXEC mode).

 

 

Series Routers Hardware Installation Guide.

See output 1 example

 

 

 

following this table.

 

 

 

 

 

 

 

 

Damaged IDSL cable.

• Order a new red IDSL cable from your Cisco

 

 

 

reseller.

 

 

 

 

• Problem with IDSL line.

• Contact your telephone service provider to report

 

 

 

a problem.

 

 

 

 

 

 

 

If the problem continues after these steps, call your

 

 

 

Cisco reseller.

 

 

 

 

• Software configuration error for

• Check your router configuration. See the

 

 

router connected to Cisco 802

documentation that shipped with your router for

 

 

IDSL or Cisco 804 IDSL router.

more information.

 

 

 

debug ppp negotiation,

• PAP or CHAP authentication

• For PAP, check the settings of the PAP hostname

debug ppp

 

failed.

and password for correct spelling and use of

authentication

 

 

uppercase and lowercase letters. If settings are

(privileged EXEC mode)

 

 

incorrect, reconfigure them.

See output 2 example

 

 

• For CHAP, clear the existing hostname and

following this table.

 

 

password. Reconfigure the hostname and

 

 

 

password.

 

 

 

 

Output 1 Example (show isdn status)

 

The current

ISDN Switchtype = basic-ni1

 

 

 

 

 

ISDN BRI0 interface

 

 

 

 

 

 

Layer 1 Status:

 

 

 

 

 

 

 

DEACTIVATED

 

 

 

 

 

 

 

 

Layer 2 Status:

 

 

 

 

 

 

 

Layer 2 NOT

Activated

 

 

 

 

 

 

Layer 3 Status:

 

 

 

 

 

 

 

No Active Layer

3 Call(s)

 

 

 

 

 

 

Activated dsl 0 CCBs = 0

 

 

 

 

 

 

Total Allocated

ISDN CCBs = 0

 

 

 

 

 

 

isdn#

 

 

 

 

 

 

 

 

ISDN BR0:TX

->

RRp sapi = 0 tei = 80 nr = 1

 

ISDN BR0:RX

<-

RRf sapi = 0

tei = 80

nr = 1

 

isdn#

 

 

 

 

 

 

 

 

ISDN BR0:TX

->

RRp sapi = 0 tei = 81 nr = 1

 

ISDN BR0:RX

<-

RRf sapi = 0

tei = 81

nr = 1

 

ISDN BR0:TX

->

RRp sapi = 0 tei = 80 nr = 1

 

ISDN BR0:RX

<-

RRf sapi = 0

tei = 80

nr = 1

 

isdn#und all

 

 

 

 

 

 

 

 

isdn#show isdn st

 

 

 

 

 

 

The current

ISDN Switchtype = basic-dms100

 

ISDN BRI0 interface

 

 

 

 

 

 

Layer 1

Status:

 

 

 

 

 

 

ACTIVE

 

 

 

 

 

 

 

Layer 2

Status:

 

 

 

 

 

 

TEI

= 80, State = MULTIPLE_FRAME_ESTABLISHED

 

TEI

= 81, State = MULTIPLE_FRAME_ESTABLISHED

 

Layer 3

Status:

 

 

 

 

 

 

 

 

 

Installing and Configuring Cisco 802 IDSL and Cisco 804 IDSL Routers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

78-10368-03

 

 

 

 

 

17

 

 

 

 

 

 

 

 

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Image 17
Cisco Systems 804, 802 manual Output 1 Example show isdn status, Command Possible Problem Solution