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ADSL line protocol down

Unanswered Question
Mar 3rd, 2006
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For dsl users, should the line protocol continue to go up/down ?


I'm constantly getting up/down between several DSL modems connecting to a Cisco 7200 DSL router.


The following settings are verified correct on Zoom ADSL modems:


user

password

vpi

vci

multiplexing method is LLC

encap is ppp with chap

(Could CHAP cause a problem with PAP?, or will CHAP accept negotiations with PAP ?)





The config on the Cisco 7200 router is


interface ATM2/0.5 multipoint

range Business-BE pvc 5/100 5/199

class-range Business-BE3

ubr 1536

encapsulation aal5snap

protocol ppp Virtual-Template1


pvc-in-range 5/100

encapsulation aal5snap

protocol ppp Virtual-Template1


interface Virtual-Template1

ip unnumbered FastEthernet0/0

peer default ip address pool jcsn_dsl01

ppp authentication pap



here are the messages

*Mar 3 18:08:23: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access35, changed state to

up

*Mar 3 18:12:02: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access35, changed state to

down

*Mar 3 18:14:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access402, changed state t

o down

*Mar 3 18:14:27: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access402, changed state t

o up


Thanks for any suggestions


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nethelper Fri, 03/03/2006 - 12:15
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Hello,


not sure if this helps, but do you have 'ppp pap sent-username' configured ? Without that, PAP won't work...


Regards,


Nethelper

boblutton Fri, 03/03/2006 - 13:12
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Thanks.

I'm using radius for authentication and that's working fine

So, I don't think the problem is "sent username" because the users are all connecting fine.

They hold the connection but only have intermittant drops.

They automatically re-sync within 10 seconds

Only the line protocol drops



Any other thoughts ?

Thanks again

arvindchari Fri, 03/03/2006 - 13:49
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  • Bronze, 100 points or more

What is the status of the LED's on your device? Do you have a successful Carrier Detect?



Line protocol errors usually mean that the DSL modem is unable to train successfuly with the ISP DSLAM. Plug out the RJ 11 jack from your modem, turn it off and turn it back on again and ensure that the LED's on the front panel are in their expected states.


Could you also post the output of

sh atm events


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