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Orion shows 3750 port speed changes - is it normal?

Hi all,

  We use Orion for monitoring.  We recently started monitoring a workstation switch and find many occurances of port speed changes indicated.  Our workstation ports are configured with auto speed and duplex.  Is it normal that we are detecting speed changes on the ports?  Do workstations running XP automatically adjust their speed for traffic management or power save?  Perhaps something like speeds changing when PC goes to sleep mode but has wake on LAN enabled?  Is it possible that the MIB is misreporting?

  I realize that there are many different NIC vendors/drivers that might act differently.  Just wondering (in others experience) if it is somewhat normal or if there is anything on network I should be looking into as to why speeds are changing?  We plan to not monitor workstation ports (only uplinks) on the switch.. but before we do, I thought I would see if what we are detecting needs to be addressed?

  Here is an example from Orion of a speed changing.  Seems always off hours:

6/1/2012 6:17:52 AM eventWoRKSTATION-3750-CLUSTER - GigabitEthernet1/0/14 · 2nd Floor Patch#11 Interface Speed changed from 10000000 to 1000000000 bps

6/1/2012 2:47:52 AM eventWoRKSTATION-3750-CLUSTER - GigabitEthernet1/0/14 · 2nd Floor Patch#11 Interface Speed changed from 1000000000 to 10000000 bps

  Thanks in advance for any experienced feedback.

--

Colin

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Orion shows 3750 port speed changes - is it normal?

Ours does it all the time for some reason.  We presume it's due to the port negotiating speed during PC boot from 100mb to 1g, but never really followed up.

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