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post #1 of 19 (permalink) Old 12-17-2004, 12:52 PM Thread Starter
oh really?
 
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cisco switch

anyone know how to clear port errors on a 2948?

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post #2 of 19 (permalink) Old 12-17-2004, 01:09 PM
duh...duh....duh
 
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it has been awhile, but clear count slot/port?

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post #3 of 19 (permalink) Old 12-17-2004, 04:32 PM
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What switch is it? What kind of errors? Are they accumulating?

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post #4 of 19 (permalink) Old 12-17-2004, 04:36 PM
duh...duh....duh
 
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Quote:
Originally Posted by ScottJ
What switch is it? What kind of errors? Are they accumulating?
err, good question. I assumed he was trying to reset the counters to 0.

Are you trying to reset the statistics/counters or stop errors from happening by fixing something?

Take care

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post #5 of 19 (permalink) Old 12-17-2004, 05:11 PM
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Quote:
Originally Posted by ceyko
err, good question. I assumed he was trying to reset the counters to 0.

Are you trying to reset the statistics/counters or stop errors from happening by fixing something?

Take care
Clearing the counters/stats would be the right 1st thing to do, that and looking to see if anything has changed config wise. Was there any new application/frame size comming into the switch that started this trouble? I hate troubleshooting ethernet, it usually just works; and the error reporting on ethernet ain't all that helpful. Usually if I have a problem with errors on a switch, it winds up being a hardware issue. I take it this switch of yours does not have modular blades? Looping the interface to itself would be useful also to see if the errors keep comming in, that and then going further away from the switch and throwing some loops up.

Hope some of this gives you a place to start.


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post #6 of 19 (permalink) Old 12-17-2004, 05:14 PM
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Quote:
Originally Posted by ScottJ
Usually if I have a problem with errors on a switch, it winds up being a hardware issue.
--Scott
Also need to add...VERIFY the darned cabling is made properly. My experience is if the cabling is good and the switch is funked, new hardware is needed....typically.

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post #7 of 19 (permalink) Old 12-28-2004, 11:18 AM Thread Starter
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there are 7 or 8 computers plugged into this switch that generate errors. if i turn a computer off, the errors stop for the port that comp was plugged into. they are all Rcv-Errors and most are runts.
what are runts?? what could these machines be sending to the switch?
one computer genereate hundreds of errors a minute.
the others just hundreds every few hours.

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post #8 of 19 (permalink) Old 12-28-2004, 11:39 AM
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Try setting the duplex and speed setting manually on the network card and mirror the settings on the switch. Try all possible options to see if it stops the issue. I've had lots of cheap cards cause all sorts of network mayham on 2950's because they wouldnt sync right.

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post #9 of 19 (permalink) Old 12-28-2004, 11:48 AM Thread Starter
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yeah on one machine, i disabled the onboard nic, put a 3com pci nic in it, locked it down to 100/full on both ends but no change.

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post #10 of 19 (permalink) Old 12-28-2004, 11:58 AM
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Have a tried a different cable? Try using a different port on the switch.

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post #11 of 19 (permalink) Old 12-28-2004, 02:20 PM Thread Starter
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i've tried different cables, nics, computers, ports. i guess it's an application on the machines causing the problem.

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post #12 of 19 (permalink) Old 12-28-2004, 02:49 PM
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Download Ethereal on the box and watch what its spewing. You will also need WinPCap which there is a link on this site also.
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post #13 of 19 (permalink) Old 12-28-2004, 03:02 PM
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You might try turning off portfast to see if that helps any.

Code:
switch#conf t
switch(config)#int f0/PutPortNumberHere
switch(config-if)#no spanning-tree portfast
switch(config-if)#exit
switch(config)#exit
switch#wr me
I've had to do this along with forceing some cards to 10/half. Thats Cisco's solution.
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post #14 of 19 (permalink) Old 12-28-2004, 11:06 PM
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Quote:
Originally Posted by mind
i've tried different cables, nics, computers, ports. i guess it's an application on the machines causing the problem.
That would elimnate everything.

Set the port in loopback ( I dont know if you can do that on a 2900 ) and see if its still doing it.

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post #15 of 19 (permalink) Old 12-29-2004, 02:02 AM
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Quote:
Originally Posted by AbecX
That would elimnate everything.

Set the port in loopback ( I dont know if you can do that on a 2900 ) and see if its still doing it.
Ya what he said, thats a good idea; I do that on interfaces all the time to prove out the hardware. Should have mentioned that earlier, doh!

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post #16 of 19 (permalink) Old 01-11-2005, 02:41 PM Thread Starter
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i turned off portfast and that didn't seem to make a difference.
i'm not sure how to put the port in loopback.

i put ethereal on the box and i'm seeing a bunch of shit but i can't figure out how to filter out stuff. i figured out how to see specific stuff, but i'd like to filter out VNC, etc... so i can see what i don't know is there. their man sux. anyone know how to filer out?
thanks!

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post #17 of 19 (permalink) Old 01-11-2005, 04:57 PM
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use tcpdump -i ethx -n not port portnumberhere and not port portnumber here.

x = the eth device.

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post #18 of 19 (permalink) Old 01-11-2005, 05:42 PM Thread Starter
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hmm i can't find tcpdump. your talkin about on the switch right?

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post #19 of 19 (permalink) Old 01-11-2005, 05:56 PM
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no, I'm talking about a sniffing tool installed on most default linux distros.

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