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Netgear Switch Showing Dropped Transmit Frames

Posted on 2014-02-17
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Last Modified: 2014-05-19
Hello,

I have a Netgear GS752TXS Switch on a small network. All computers have 1Gig cards, and the server has a 10G SFP+ connection.

On some (not all) of the ports on the switch, I am seeing "dropped transmit frames".

I'm hoping to get some insight into what might be causing those, or if I even need to worry about it.

For example on one port, in the past 24 hours there have been 1300 dropped transmit frames. Others have as few as 10. Of the 20 ports being used, 11 are showing dropped transmit frames. As a point of reference, I reset them all to zero yesterday, so those are showing up just in the past 24 hours..

Are those dropped transmit frames from the switch to the computer or the other way around? and what might be causing them?

Thanks in advance,
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Question by:ChiIT
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Expert Comment

by:Infamus
ID: 39866342
Try manually assign port speed and duplex on the switch and the device then see what happens.
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Author Comment

by:ChiIT
ID: 39866357
I'll try and see what happens tomorrow. Right now both are set to auto..

Any idea what might be causing those?
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Expert Comment

by:Infamus
ID: 39866369
Some devices doesn't work well on auto.

I've seen getting crc or input drops caused by the auto negotiation.

That might not be the cause but it is the first thing to look at.
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Author Comment

by:ChiIT
ID: 39866377
Will try tomorrow and report back...thanks..
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Expert Comment

by:giltjr
ID: 39873148
It's possible you may be seeing micro-bursts, small periods of time where you are trying to send more traffic out a port than the port can handle or than the receiver can handle.

Although you may not be seeing high port utilization it may only take a second or two to exceed the outbound buffer for that port.

Is the host connected to the port showing the high number of dropped frames a host that should be receiving a lot of traffic?  If not, is it a host that has a high CPU utilization?
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by:ChiIT
ID: 39873168
Hi Giltmr, that's  an interesting thought..when you say host, are you referring to the server?

The ports with the dropped frames are all desktop PCs..
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Expert Comment

by:Infamus
ID: 39873208
If they are all desktop PC's then there's no point to set the speed manually because auto should work just fine.

It might be micro-bursts as giltjr mentioned but it could also be a bad switch.

Have you considered upgrading the firmware as an option?
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by:giltjr
ID: 39873284
A "host" means just about anything that has a IP address.  Could be a server, could be a desktop, could be router actually could be another switch.
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by:ChiIT
ID: 39873318
thank you both.

Infamus, the switch is brand new, just installed it about 2 months ago....Pretty much the default config....

Giltjr, the thing I'm thinking from your idea has to do with CPU (and memory, though you didn't mention it, but you prompted that thought).

The desktops all run an app that connects to a SQL server backend, so they do all receive a lot of traffic. Not all PC's experience the dropped packets though.

I am going to do a little digging to see if by chance the PC's with the dropped packets have something in common..perhaps less memory, slow CPU, 32bit Windows7...not sure, just throwing those things out if they might be causing the issue?
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by:giltjr
ID: 39873439
Actually I asked " ...it a host that has a high CPU utilization? "

With high CPU utilization, once the NIC buffer gets full, it will stop receiving data and the switch could start dropping frames.

Do you see other errors on that switch port?  Could be a bad cable or bad NIC on the computer.

So you may want to swap out patch cables at both ends.


It is also possible, like Infamus mentioned, that switch port could be bad.  If you have a open port you may want to move the computer to it and see what happens.  If you don't have an open port, you may want to swap ports with another computer.
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ChiIT earned 0 total points
ID: 39874971
There are no other errors on the ports that are reporting dropped frames. I will check on high cpu utilization.

There are 11 of the 48 ports that have dropped errors. I don't think its the switch unless its the whole switch...

Good test though, will swap wall jack connections to see if it stays with the port or follows the computer...
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Author Closing Comment

by:ChiIT
ID: 40074474
Looks like it was wiring/jack....
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