ā07-05-2013 01:08 AM - edited ā03-03-2019 07:07 AM
Hi All,
I'm having trouble with the logging in cisco. It started when I enable the debug ip packet command. I notice that after enabling it whenenver check the system log in csco 3750 it always show below image:
what I want to see is the below image when I execute the show logging command. How will I turn it back to this logging. I already turn off debug ip packet. Please help I'm already lost. I don't know what to do...
Thank you in advance and any help will be greatly appreciated,
Nhel
ā07-05-2013 01:13 AM
Hi,
type the command clear log in privileged mode.
Regards
Alain
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ā07-05-2013 02:26 AM
Hi cadet alain,
I already did that but unfortately when I execute again the show logging it doesn't show the same log. It only showed below:
It does not show the link state messages.
ā07-05-2013 02:36 AM
Hi,
ok so if I understand correctly you want to see previous messages that were in the buffer before you got the debug output?
If you cleared the log then they are lost unless you also sent them to a syslog server.
If you log to the buffer don't forget that the buffer has a small size by default and that it is circular which means that once it is filled newest messages replace the older ones so as you fiiled it with the debug chatty output then it overwrote the log messages you wanted to see.
To summarize, you won't see them again unless you sent them to syslog server too and even without clearing the logs you would have been in same situation.
Regards
Alain
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ā07-05-2013 02:43 AM
Nope, I'm not looking for logs before I clear it. What I want to see is the current messages in the cisco device. Even I down a port in that switch it does not show in the logging. It shows only the vty logs.
ā07-05-2013 02:49 AM
Hi,
ok can you post sh log and sh run | i logging
Regards
Alain
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ā07-07-2013 04:27 PM
Hi!
Sorry for the late reply.
Please see attach as requested.
HOGP_B_CS01#show logging
Syslog logging: enabled (7179420 messages dropped, 0 messages rate-limited, 0 fl
ushes, 0 overruns, xml disabled, filtering disabled)
No Active Message Discriminator.
No Inactive Message Discriminator.
Console logging: level debugging, 2284539 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 21075 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 2284539 messages logged, xml disabled,
filtering disabled
Exception Logging: size (4096 bytes)
Count and timestamp logging messages: disabled
File logging: disabled
Persistent logging: disabled
Trap logging: level informational, 848319 message lines logged
Log Buffer (4096 bytes):
*Sep 4 06:06:27.847 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (172.25.75.68)
*Sep 4 06:13:04.762 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (172.25.75.68)
*Sep 4 06:13:33.082 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (172.25.75.68)
*Sep 4 06:13:58.659 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (172.25.75.68)
*Sep 4 06:55:07.452 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (172.25.75.68)
*Sep 4 06:55:08.517 GMT: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host
*Sep 6 21:52:34.438 GMT: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host
*Sep 6 21:52:55.762 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (IP Address)
*Sep 6 21:53:57.427 GMT: %SYS-5-CONFIG_I: Configured from console by fujitsu on
vty0 (IP Adress)
HOGP_B_CS01#sho run | i logging
logging synchronous
logging synchronous
logging synchronous
ā07-12-2013 10:03 AM
Hello,
Did you try to configure any types of logging?
(config)#logging buffered ?
<0-7> Logging severity level
<4096-2147483647> Logging buffer size
alerts Immediate action needed (severity=1)
critical Critical conditions (severity=2)
debugging Debugging messages (severity=7)
emergencies System is unusable (severity=0)
errors Error conditions (severity=3)
filtered Enable filtered logging
informational Informational messages (severity=6)
notifications Normal but significant conditions (severity=5)
warnings Warning conditions (severity=4)
xml Enable logging in XML to XML logging buffer
Best Regards
Please rate all helpful posts and close solved questions
ā07-20-2013 11:38 AM
From the information in his previous post it is clear that Nhel has not configured any special logging and that it is operating with default parameters.
Console logging: level debugging, 2284539 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 21075 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 2284539 messages logged, xml disabled,
filtering disabled
So console, monitor, and buffer logging are each operating at debug level. If interface down messages are generated they should be visible in the logs.
So now I am thinking about when interface down messages are generated and when they are not generated. In the original post there are some log messages indicating that the line protocol for some VLANs have changed state to down. (obviously messages were generated). But Nhel also says that "Even I down a port in that switch it does not show in the logging." (messages not generated). This leads me to think that the switch is configured so that a physical port changing state does not generate log messages but if the VLAN goes down that it does generate log messages. To prove this I wonder if Nhel would try the command logging event link-status default
and let us know if the behavior changes.
You can use this link to get more information about it
http://www.cisco.com/en/US/docs/ios/fundamentals/command/reference/cf_l1.html#wp1025176
HTH
Rick
ā07-25-2013 10:47 PM
Hi Richard,
Unfortunatel there's no logging event link-status default command in my core switch. Please see below for the available commands.
Thanks
ā07-26-2013 08:57 AM
Nhel
Your post says see below for available commands. But there was nothing below.
You have told us that this is a 3750 switch but not which version of code it is running. So I looked in the command reference of a fairly recent version for 3750. The link is below. It says that there is an interface level command for logging event link-status. I do not find a global command in the command reference, though I know that there is a global command for at least some models of switch. Perhaps not for the 3750?
HTH
Rick
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