06-04-2008 05:53 PM - edited 03-05-2019 11:26 PM
I just configured a 2960 switch with 3 VLAN's. I'm having some issues with interfaces when I go look at the system log. They are constantly going up and down.
Here is an example:
Description: Interface FastEthernet0/9, changed state to down
Explanation: The interface hardware went either up or down.
Recommended Action: If the state change was unexpected, confirm the configuration settings\n\ for the interface.
Type: LINK-3-UPDOWN
06-04-2008 06:06 PM
The log messages that you see are common when your logging is set to informational. If users are shutting down, booting, restarting a PC you will see this log entry. You should disregard this message unless it appears to be happening frequently, if so I would recommend checking out the device connected to that switchport.
HTH,
Mark
06-04-2008 06:29 PM
Thank you for your reply Mark. We connected two different laptops that work fine with no issues to multiple ports and the interface was generating these errors. However when I did a continuous ping to those two laptops not a single packet loss out of 2000 pings. So it is safe to say that my configuration is ok? I see these messages even if nothing is connected to the port. These errors show up as "Critical" errors.
06-04-2008 11:55 PM
Hi Mark,
What is on port 9? If this is a critical uplink, I'd say you have a problem on your hands, but, as the previous poster mentioned, if this is a user, there isn't anything to be worried about there. It will get printed whenever somebody connects/disconnects from the port.
You can try using the command 'no logging event link-status' on the interface to squelch the messages if desired.
06-05-2008 01:10 AM
Mainly its fe01, 0/9 and 0/12 generating these errors. 1 and 9 had laptops connected to it. However nothing is connected to them right now, they are simply access ports. 12 we have a Server connected to it.
These critical errors are showing up under system messages and show up, if some thing is connected or not connected to the ports.
06-15-2008 05:21 AM
Just wanted to let every one know that after working with Cisco TAC we are replacing that switch.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide