DSL troubleshooting

[boblutton]

I'm trying to connect a Zoom DSL modem to 7200 router.

Debugging from 7200 shows that when the Zoom tries to connect, it succeeds. It's link lights show connected. Surfing is good, and consistant.

But,while connected,and while surfing, more debugging shows line protocol going up and down all the time on the "virtual-access" interface

Does this mean that the line protocol for the virtual interface (up or down) has nothing to do with whether the connection is up ?

Any suggestions or good links for troubleshooting DSL ?

[thisisshanky]

I assume, you are using 7200's FE to do PPPOE/OA ? Could you paste your configs ? Virtual access interface comes up after PPPOE negotiations completes and it gets an ip address leased.

You could use debugs such as

debug vpdn pppoe-events

show vpdn

debug pppoe-errors

debug pppoe-packets

PPP layer troubleshooting can be done with

debug ppp auth

debug ppp neg

HTH

PS: please remember to rate helpful posts!

[arvenugopal]

Hi,

To add note iam attaching the following URL which will give you info on the troubleshooting.

http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1834/products_feature_guide09186a00800800f4.html

Cheers

Rate it if useful

[c.walsh]

the link you provided for the troubleshooting guide does not work, do you have a valid link?

Colin

[boblutton]

Is the virtual-access on layer 2 or 3.

I've tried debugs for ppp authentication, negotiation and errors, but can't see anything conclusive

i'm using the atm interface

modems are configured with pppoa and llc

here are some key config statements from the 7200

interface ATM2/0.1 multipoint

class-int res-b

range Res pvc 1/100 1/500

class-range Res-B

ubr 1536

encapsulation aal5snap

protocol ppp Virtual-Template1

.....

pvc-in-range 1/114

.....

vpdn enable

!

.....

vpdn-group 1

accept-dialin

protocol pppoe

virtual-template 1

[boblutton]

Is the virtual-access on layer 2 or 3.

I've tried debugs for ppp authentication, negotiation and errors, but can't see anything conclusive

i'm using the atm interface

modems are configured with pppoa and llc

here are some key config statements from the 7200

interface ATM2/0.1 multipoint

class-int res-b

range Res pvc 1/100 1/500

class-range Res-B

ubr 1536

encapsulation aal5snap

protocol ppp Virtual-Template1

.....

pvc-in-range 1/114

.....

vpdn enable

!

.....

vpdn-group 1

accept-dialin

protocol pppoe

virtual-template 1

[boblutton]

Is the virtual-access on layer 2 or 3.

I've tried debugs for ppp authentication, negotiation and errors, but can't see anything conclusive

i'm using the atm interface

modems are configured with pppoa and llc

here are some key config statements from the 7200

interface ATM2/0.1 multipoint

class-int res-b

range Res pvc 1/100 1/500

class-range Res-B

ubr 1536

encapsulation aal5snap

protocol ppp Virtual-Template1

.....

pvc-in-range 1/114

.....

vpdn enable

!

.....

vpdn-group 1

accept-dialin

protocol pppoe

virtual-template 1