ADSL Training Log TroubleShooting

Document

Nov 24, 2010 12:07 PM
Nov 24th, 2010

Before 12.4(11)XJ, all fixed and modular ADSL routers could use the command "dsl enable-training-log" to retrieve information about the events during the ADSL training. This command however retrieved the log file from the ADSL chipset at showtime and displayed it when the "sh dsl int" command was used.

The disadvantage of this is that events that events that caused failures (line flaps, CRC errors) could not be seen from the training log.

In 12.4(11)XJ sub-commands to the "dsl enable-training-log" command have been added that allow users to capture the log on different events.

The command syntax is dsl enable-training-log  {delay [seconds] | failure | ondemand | showtime}

This command enables the training log to record the firmware debug messages. The log can be retrieved from the ADSL chipset after the ADSL line goes into Showtime or after the ADSL comes out of Showtime or whenever the user enters the show dsl interface atm command. The delay option can be used to delay the retraining of the line after the log is retrieved from the chipset. Because only one log buffer is used to capture the log, the subsequent line state changes will overwrite the buffer. The delay option allows the user enough time to capture the log from the output of the show dsl interface atm command. By default, the training log is disabled.

Download the document Training Log COllection using IOS 12.4(11)XJ and later for detailed instructions.

For additional resources for debugging ADSL issues visit the FAQ

ADSL training log collection steps


1.   Training log collection for an unstable DSL connection

The following steps are used when the training log needs to collected after the DSL line comes out of the show time state (in case of line flapping issues).  The retrieved log from the ADSL chipset is stored in a buffer and displayed in the output of "show dsl int atm" command.
a)     Enable the training log collection for failure cases only, dsl enable-training-log failure delay <nsecs> (under "interface atm 0" sub-config)

The "delay <nsecs> specifies how many seconds to wait before retraining the line once the log is retrieved from the chipset.  This will give enough time to the user to capture the output of "show dsl int atm" command, before the log buffer overwritten.  The <nsecs> varies from 0 to 600 seconds.   The default is 0 seconds.

b)     Enable the DSL debug,  debug atm events
c)     Wait for the following message *Jul  8 09:36:30.671: DSL(ATM0): Training log collection completed
d)     Capture the output of "show dsl int atm0"


2.   Training log collection for a show time case

The following steps are used when the training log needs to be collected after the DSL line successfully trains up and enter the showtime state.
a)     Enable the training log collection for showtime cases only,dsl enable-training-log showtime delay <nsecs> (under "interface atm 0" sub-config)

The "delay <nsecs> specifies how many seconds to wait before retraining the line once the log is retrieved from the chipset.  This will give enough time to the user to capture the output of "show dsl int atm" command, before the log buffer overwritten.  The <nsecs> varies from 0 to 600 seconds.  The default is 0 seconds.
b)     Enable the DSL debug,  debug atm events
c)     Wait for the following message       *Jul  8 09:36:30.671: DSL(ATM0): Training log collection completed
d)     Capture the output of "show dsl int atm0"


3.   On demand training log collection

The commands "dsl enable-training-log showtime" and "dsl enable-training-log failure" are used when the training log needs to be collected just after the line goes into showtime and just after the line goes down respectively.  These previously collected log files are displayed in the output of "show dsl int atm0".   But, if the log needs to be retrieved from the chipset during the execution of "show dsl int atm0", then "dsl enable-training-log ondemand" needs to be used. Use this command only when the line is in Showtime.

a)     Enable the training log collection for ondemand case only. If this "ondemand" type of log generation is configured, then the "show dsl int atm0" command takes few minutes to capture the log and display it. dsl enable-training-log ondemand (under "interface atm 0" sub-config)
b)     Capture the output of "show dsl int atm0".

Enhancements to ADSL training log collection

1.    Dsl enable-training-log command

To enable the retrieval of the digital subscriber line (DSL) training log, use the dsl enable-training-log command in interface configuration mode. To disable retrieval of the DSL training log, use the no form of this command.  dsl enable-training-log [always | showtime | failure | ondemand] [delay <nsecs>]no dsl enable-training-log  Syntax Description:

OptionExplanation
alwaysThe log is read both after show time and for  failure   cases.  The "show dsl int atm0" will   display the previously  collected log file.
showtimeThe log is read only after show time and not for failure   cases. The  "show dsl int atm0" will display the previously collected log   file.
failureThe log is read only for failure cases.  The log is collected when (a)  the line   fails to train up, and, (b) the line comes out of showtime.   The "show dsl int atm0" will display the   previously collected log  file.
ondemandThe log is read when "show dsl int atm0" is   executed.  The log is  collected during   the execution of "show dsl" and then it will be  displayed.
delay <nsecs>Specifies how many seconds to wait after the log is retrieved   form the  chipset.  When the line is   flapping, the log buffer will be  continuously overwritten after line   failures.  This will not give  enough   time for the user to capture the log file.  Using this command,  the user can specify the number of seconds to be   waited after the log  is generated and before the next training of the line.
The <nsecs> varies from 0 to 600 seconds.   The default is 0 seconds.

2.   Debug messages for ADSL log generation events

New debug messages are generated before starting the collection of  ADSL training log files and after the completion of the training log  files.  Enable, "debug atm event" to generate these messages. *Jul  8  09:36:07.759: DSL(ATM0): Training log collection started (log size  236871)...

*Jul  8 09:36:30.671: DSL(ATM0): Training log collection completed

Average Rating: 0 (0 ratings)

Actions

Login or Register to take actions

This Document

Posted November 24, 2010 at 12:07 PM
Stats:
Comments:0 Avg. Rating:0
Views:4847 Contributors:0
Shares:0
Tags: adsl, training
+

Related Content

Documents Leaderboard