At this point there are only three commands that will be of any use in
troubleshooting the ISDN connection:
First two:
show controller bri
show isdn status
Show controller bri specifically looks at the "D" channel while show isdn status
looks at all three layers.
If layer one shows "deactivated", you are not even seeing the telco's isdn switch.
Things to check:
1) Is the physical connection from your router wired corrrectly?
2) Who is suppling what interface (U or S/T). Do you need a NT1?
After you have checked the above try "debug bri" (careful, this spits out a ton of
info. Do a "no debug all" first). If you have an electrical connection to the
switch, you should see some output from this command. (Make sure you do a "no
debug all" when you are done.
3) Have you specified the correct switch type?
Once you hace established Layer 1 and the "D" channel is up, you should be good.
If not, you can then try "debug isdn q921" to check layer 2 negotiations and
"debug isdn q931" for layer three.
Good luck......
Ravi Kumar wrote:
> hi friends
>
> I am in deep trouble. help required
>
> I am ravi kumar from HYDERABAD, INDIA
>
> i have a 2503 router in my office. recently we got ISDN connection from local
> basic telephone service provider (DOT) and bought ISDN internet account from
> local ISP. I want to provide internet access to all my staff through this
> router.
>
> i configured my router's BRI 0 port with following commands for DDR.
>
> 1)router# config terminal
>
> 2) ip route 0.0.0.0 0.0.0.0 bri 0
> and
> 3) ip router 0.0.0.0 0.0.0.0 next hop count
>
> 3) dialer-list 4 protocol ip permit
>
> 4)interface bri 0
> (i did not assign any ip address to bri port, since ISP server will give ip
> address to port once connection is established)
>
> 5) isdn switch type basic-net3
>
> 6) isdn spid1 <7digit number>
>
> 7) dialer-group 4
>
> 8) dialer map ip nexthopaddress numbertodial
> (basically ISP will give only phone number to dial. but by using isdn card in
> my pc and dialing to ISP, i got dial-up server ip address. i used this address
> as gateway address for my router)
>
> 9) encapsulation ppp
>
> 10) ppp authentication pap username xyz password abc
>
> 11) dialer idle-timout 30
>
> after this i saved configuration and rebooted the router.
>
> if i run show ip interface, it is showing bri 0 is up and line protocol is
> up.
> but if i run show isdn status, it is showing bri 0 layer is deactivated and
> layer 1 is not active.
>
> my queries are
>
> 1) is this configuration is right or wrong?
>
> 2) if it is right, how it initiate the call to isp?
>
> 3) if it is not right, pls let me know step by step cofiguration to dialup
> ISP.
>
> your help in this regard is highly apprecaited.
>
> regards
> ravi kumar B.
>
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