10-17-2008 05:17 AM - edited 03-03-2019 11:58 PM
How can I dig down a bit deeper and debug why a pppoe connection is dropping?
My log is below and this happens intermitently on my cisco 1801 - it doesn't happen on the free Eircom router which means it's not a physical line issue as the error suggests
Any ideas anybody?
Thanks
Colin
*Oct 13 10:05:39.962: %LINK-3-UPDOWN: Interface ATM0, changed state to down *Oct 13 10:05:40.962: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to down *Oct 13 10:06:25.218:
%DIALER-6-UNBIND: Interface Vi1 unbound from profile Di0 *Oct 13
10:06:25.230: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to down *Oct 13 10:06:26.218: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to down *Oct 13 10:06:46.462:
%LINK-3-UPDOWN: Interface ATM0, changed state to up *Oct 13
10:06:47.462: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to up *Oct 13 10:08:52.558: %DIALER-6-BIND: Interface Vi1 bound to profile Di0 *Oct 13 10:08:52.562: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up *Oct 13 10:08:56.074:
%LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up
10-17-2008 05:36 AM
Hello Colin,
use the following document for a router acting as PPPoE client:
http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a008071a7c2.shtml
Hope to help
Giuseppe
10-17-2008 05:41 AM
Thanks for the reply
I have been through this and everything is ok. I should have said that the connection works and the site-to-site I created works great. But the connection drops occasionally, about twice a day with no pattern. What I need to do is drill down a bit further into the log I posted above and debug whay is actually happening when the atm inferface goes down.
Thanks
Colin
10-17-2008 05:46 AM
Hello Colin,
try to collect every day the output of
sh dsl interface
on 30 minutes interval
look for errors, may be there are bursts of erros that make the ADSL link to be dropped
Hope to help
Giuseppe
10-17-2008 05:51 AM
thanks, there is a lot of info here, what should I be looking for, your help is much appreciated
Dublin1801W#sh dsl int
ATM0
Alcatel 20190 chipset information
ATU-R (DS) ATU-C (US)
Modem Status: Showtime (DMTDSL_SHOWTIME)
DSL Mode: ITU G.992.5 (ADSL2+) Annex A
ITU STD NUM: 0x03 0x2
Chip Vendor ID: 'STMI' 'BDCM'
Chip Vendor Specific: 0x0000 0x6198
Chip Vendor Country: 0x0F 0xB5
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x0000 0x0000
Modem Vendor Country: 0xB5 0x00
Serial Number Near: FCZ1231900JCISCO73916708
Serial Number Far: Chip ID: C196 (0)
DFE BOM: DFE3.0 Annex A (1)
Capacity Used: 100% 100%
Noise Margin: 6.0 dB 10.5 dB
Output Power: 20.0 dBm 12.0 dBm
Attenuation: 27.0 dB 11.0 dB
Defect Status: None None
Last Fail Code: None
Watchdog Counter: 0x53
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction: 0x00
Interrupts: 4380111 (0 spurious)
PHY Access Err: 0
Activations: 42
LED Status: ON
LED On Time: 100
LED Off Time: 100
Init FW: init_AMR-3.0.014_no_bist.bin
Operation FW: AMR-3.0.014.bin
FW Source: embedded
FW Version: 3.0.14
DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 11853 0 1021
Cells: 0 5856966 0 24296518
Reed-Solomon EC: 0 4195 0 0
CRC Errors: 0 371 0 0
Header Errors: 0 379 0 0
Total BER: 0E-0 1922E-9
Leakage Average BER: 0E-0 1171E-9
Interleave Delay: 0 16 0 8
ATU-R (DS) ATU-C (US)
Bitswap: enabled enabled
Bitswap success: 0 0
Bitswap failure: 0 0
LOM Monitoring : Disabled
DMT Bits Per Bin
000: 0 0 0 0 0 0 0 7 9 A A B C C D D
010: E E E E E E E E E E D D C B B A
020: 0 7 8 8 A A B C C D D E E E F F
030: F F F F F F F F F F F F E F F F
040: F F F F F F F F F F F F F F F F
050: 2 F F F F F F F F F F F F F F F
060: F F E B C E F F F F F F F F F E
070: E E E D D C B 7 8 B C D D E E E
080: E E E E E E D B D C A 5 9 B C D
090: D D D D E E E E E E E E E D D 9
0A0: D E E E E E E E E E E E E E E D
0B0: B B A 4 2 C D D D D E D D D D D
0C0: D D C C A 9 7 0 7 A A A B B B B
0D0: B B B C C B B B A 9 7 1 5 A A B
0E0: B A B C C C C C C C C C B A 8 6
0F0: 9 B B B C B B B 9 B B B B B A A
100: A 8 5 5 7 9 A A A A A A A A 9 9
110: 9 9 9 9 8 7 4 5 7 8 8 8 8 8 8 8
120: 8 8 8 8 8 7 7 7 7 7 3 5 7 7 8 8
130: 8 8 8 8 8 8 8 8 8 8 8 8 8 7 3 7
140: 8 8 8 8 8 7 8 8 8 8 8 8 8 7 7 7
150: 6 6 1 6 6 7 7 6 6 6 6 5 5 5 5 5
160: 5 5 4 4 0 0 0 1 2 2 4 3 4 2 2 3
170: 3 2 2 2 2 2 2 2 0 0 0 1 2 2 2 1
180: 2 2 2 2 2 2 2 2 2 1 1 0 0 0 0 0
190: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1A0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1B0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1C0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1D0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1E0: 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0
1F0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
DSL: Training log buffer capability is not enabled
Colin
10-18-2008 12:24 PM
If the DMT Bits per BIN is the Signal strength of your DSL connection there seems to be some problem around the 0B3-0B4,0C6-0C8, and 0D9-0DB where the signal strength plummets. Could be possible there may be either bridge taps or a problem with your copper wiring.
10-18-2008 12:56 PM
Hello Rudy,
the DMT bits per tone/subcarrier says what modulation is used for a specific tone/subcarrier. Technically it is not a direct signal strength measure but your suggestions are correct there is something that disturbes in this range of frequencies and the modems have self-adapted using less bits/tone provide more noise margin
Hope to help
Giuseppe
10-18-2008 01:04 PM
Hello Colin,
we can see there are errors not very high but not neglectible.
Speed (kbps): 0 11853 0 1021
Cells: 0 5856966 0 24296518
Reed-Solomon EC: 0 4195 0 0
CRC Errors: 0 371 0 0
Header Errors: 0 379 0 0
>>Total BER: 0E-0 1922E-9
>>Leakage Average BER: 0E-0 1171E-9
Interleave Delay: 0 16 0 8
bit error rate is 1922 * 10^-9
371 /5856966
6,3343376075599551030345745561781e-5
Ask your provider to qualify the line and have the line fixed if necessary.
Hope to help
Giuseppe
10-20-2008 07:00 AM
Thanks again for helping me with this. I have been onto my ISP and they have confirmed there is not an issue with the line - this is confirmed by the fact the line doesn't drop when connected to the free eircom adsl router. Would a software upgrade on the router help or could it be a faulty card? I have a fixed port 1801W?
Thanks
Colin
10-20-2008 09:15 AM
Hello Colin,
>> there is not an issue with the line - this is confirmed by the fact the line doesn't drop when connected to the free eircom adsl router
I would consider a DSL firmware upgrade: this can be done without changing the current IOS image or by changing the IOS image.
If you have a chance to try with another DSL Wic this is also a viable option.
So also using the 1801W can be a viable option: if you are sure you don't need to add any module this router can be fine.
I would:
try with 1801W to see if behaviour changes
if the problem is fixed and you don't mind about the fact it is a closed box stop
otherwise if 1801W works but it can be a limit in the future try to upgrade firmware or to have another WIC installed.
Hope to help
Giuseppe
10-23-2008 02:35 AM
I also have the following logged when the tunnel is connected...
%CRYPTO-4-IKMP_NO_SA: IKE message from
I have checked the SA and ISAKMP lifetimes on the 1800 and on the ISA box and I think they match - the tunnel is up most of the time
Thanks
Colin
10-23-2008 02:54 AM
Hello Colin,
if you receive this message from time to time (not often) don't worry about it.
SA have also a traffic volume lifetime and the first to expire will cause SA negotiation again.
We had an issue with hub routers 7206VXR using stateful IPSec but in your case at the other end there is a different device.
Hope to help
Giuseppe
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