[cisco-nas] Dial-IN problems with an AS5200

[Hauke Krull]

Hello!

Thanks for your reply!

Aaron Leonard schrieb:
> Your debugs show that the call connected at ISDN layer 3,
> but that the sync PPP packets sent by each side failed
> successfully to be received by the other side.
> 
> Presumably if you were to do a "show interface WHATEVER:B-CHANNEL"
> before and after the call, you would see packets transmitted
> and input errors incrementing.

No, there are no input or output errors increasing on serial 0:x during this
failed calls. Only 'interface resets' and 'carrier transitions' are increasing
by 1 after each failed call.
Also there are no input or output errors on ser 0:15 and 'sh contr e1 0' shows
no errors at all for the last 24h.


> This is very likely simply caused by transmission problems
> in your circuit network.

Because of the above I doubt this.


> A less likely cause would be a problem in the AS5200, where
> some particular timeslot in the E1 controller is misbehaving.
> See if the failing calls are or are not associated with the
> E1 timeslot.  If so, then this would be the 5200's fault,
> not the PSTN's.


When the problem occurs (about 24h after the last reboot??) about 9 out of 10
dialins failed with the mentioned symptoms.
Right after rebooting the AS5200 (almost?) every dialin-attempt is successful.

During the first 3h on most B-channels were only succesful calls (21), on some
were only failed calls (4) and on some were first succesful and later failed
calls (3).

The last thing we've changed before this problem was a RAM- and Flash-Upgrade
combined with an IOS-Upgrade. Could this problem be related to a defective RAM
chip?

Memory seems OK before the reboot:
ranke01#sh mem dead       
                Head    Total(b)     Used(b)     Free(b)   Lowest(b)
Largest(b)
Processor      EA32C    15817940     3717648    12100292    11630320
12020164
      I/O   20000000     4194304     1551900     2642404     2411572
2639100
...
2360 bytes dead Proceccor Mem

Regards
 Hauke Krull
-- 
Dipl.-Phys. Hauke Krull  
NetUSE AG
Dr.-Hell-Straße, D-24107 Kiel, Germany
Fon: +49 431 386435 00  --  Fax: +49 431 386435 99