I am saravanan from Bangalore. I have 20 numbers of cisco 2950 switches, some switches are given error msgs in the following
%LINK-3-UPDOWN: Interface FastEthernet0/8, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down
%LINK-3-UPDOWN: Interface FastEthernet0/2, changed state to down
I checked the particular user system, It's in switchoff only. Even though these type of error msg come on frequently. Not only in booting time of the system, even working time also that same error msg come.
Then another one error msg is spanning tree block the port, but that port is connected to normal system only. Once we unplug and plug the cable in the same port, then it's working finely. Please tell me what's the reason for that.
Below error can be of flapping of the system in switches and it can be a informational message and usually requires no action.
If the state change was unexpected, confirm the interface was not administratively shutdown. If so, Issue a 'no shutdown' on this interface to enable it. Also, check the physical cabling. Ensure that the appropriate cables (i.e. straight through or cross-over) are being used. Moreover, verify the proper duplex and speed is configured. Check that the correct media-type is configured when applicable (10BASE-Tor AUI). Lastly, if this interface is not in use issue a 'shutdown' to disableit.
Spanning tree blocking the port is genrally when ever there is up/down state in switch STP calculate at that time it showing it has blocked that particular port.
Im not sure if this will be solved with IOS upgrades.. these look valid informational messages, and used for troubleshooting.. If you dont want these messages you can change the logging levels on the switch.. Is this causing an issue on the network ?
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