[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now

x
?
Solved

Netgear Switch Showing Dropped Transmit Frames

Posted on 2014-02-17
12
Medium Priority
?
852 Views
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,
0
Comment
Question by:ChiIT
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 3
  • 3
12 Comments
 
LVL 12

Expert Comment

by:Infamus
ID: 39866342
Try manually assign port speed and duplex on the switch and the device then see what happens.
0
 
LVL 2

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?
0
 
LVL 12

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.
0
Learn Veeam advantages over legacy backup

Every day, more and more legacy backup customers switch to Veeam. Technologies designed for the client-server era cannot restore any IT service running in the hybrid cloud within seconds. Learn top Veeam advantages over legacy backup and get Veeam for the price of your renewal

 
LVL 2

Author Comment

by:ChiIT
ID: 39866377
Will try tomorrow and report back...thanks..
0
 
LVL 57

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?
0
 
LVL 2

Author Comment

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..
0
 
LVL 12

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?
0
 
LVL 57

Expert Comment

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.
0
 
LVL 2

Author Comment

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?
0
 
LVL 57

Expert Comment

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.
0
 
LVL 2

Accepted Solution

by:
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...
0
 
LVL 2

Author Closing Comment

by:ChiIT
ID: 40074474
Looks like it was wiring/jack....
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We recently endured a series of broadcast storms that caused our ISP to shut us down for brief periods of time. After going through a multitude of tests, we determined that the issue was related to Intel NIC drivers on some new HP desktop computers …
WARNING:   If you follow the instructions here, you will wipe out your VTP and VLAN configurations.  Make sure you have backed up your switch!!! I recently had some issues with a few low-end Cisco routers (RV325) and I opened a case with Cisco TA…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Suggested Courses

656 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question