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Error on Cisco 3560 Switch port

Port is green for long time and occasionally goes into a short cycle where it flashes between green and orange. Then the problem clears and it's solid green.  This sequence continues.

The port connects this switch to an old HP AdvanceStak 10BaseT hub (Yeah, I know.)

Previously, I had a Cisco 3560-24ps, and one port on it went to the HP hub.  Everything worked fine with default settings on the 3560-24PS, port showed green and all was well.  No need to change port speeds or duplex, all set to auto.

The 3560-24ps had to go somewhere else and in it's place is now an updated 3560G-24PS.  The default port setting on the new switch to the HP hub handles as described initially, with the cycling period between green and green/orange).    In addition, it does the same thing when I try changing any of the port settings to step it down (although this was not needed on the older 3560-24PS). Different ports, same results.

There is no indication of a problem on the receiving side, where everything appears stable.  It has been left this way for the past 8 hours now.

I have readjusted port settings several times and experimented with different things.

I want to believe that the 3560G is just more sensitive and, without actually being a error (collision or otherwise), it's saying "Hey, I'm hooked up to a real slow device. What on earth are you thinking!!!!"

Thanks.
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Mixmangle
Asked:
Mixmangle
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2 Solutions
 
memo_tntCommented:
switchport trunk encapsulation dot1q
switchport mode trunkswitchport trunk encapsulation dot1q
switchport mode trunk


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oferamCommented:
It might be Spanning tree problem Check the STG definitions, and verify that you don't have a loop / duplicate MAC in your network that might cause this behavior.

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MixmangleAuthor Commented:
OK,  memo_tnt I see now in CNA that it wants to apply different settings related to trunk. When I compate this port VLAN settings to others I see the differences. See my pic below.

So your commands will force it into a different state?  Question, any problems with the way it is now and again, why did the old 3560-34ps not need any such adjustment. And once more, I would appreciate more of an explanation.



3560-port.jpg
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Istvan KalmarCommented:
Hi,

It shows there is a lot of congestion on your ports....

Please do the follwing:
 
int gig0/9
 speed 10
 duplex half

Best regards,
Istvan
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rochey2009Commented:
Hi,

The orange and green flashing could be an indication of ethernet collisions. Please can you post

show interface g0/9
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MixmangleAuthor Commented:
But port is set to autoAnd when I confirm actual status, it IS    Already dropping down to 10 and half duplex. If I manually adjust these settings I see no change. Port statitstics confirm all the collisions, of course. But like I said in origional post "I have readjusted port settings several times and experimented with different things" this tncludes throttling port back. no change in lights. And again, previos 3560 showed no such behavior. Thanks
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oferamCommented:
It might be far fetched, but did you try to change the network cable?
It sounds stupid, I know, but bad cables can cause all kind of weird behaviors
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MixmangleAuthor Commented:
Yes, and I keep coming back to The fact that the previosu 3560, Which I had installed after a a full reset and no special setup, did not show this behavior. It's almost like the 3560G is more sensitive and registering something the previous switch ignored.
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rochey2009Commented:
please can you post

show interface g0/9

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MixmangleAuthor Commented:
Sorry, will do but I am unavslable till mid Jan back at this location. Left them running as is with no apparent detriment. Will post interface when I get back there thanks.
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MixmangleAuthor Commented:
rochey2009 and others,

I have not been able to get to the location to set up a local console connection. However, I have been able to remote into a computer on the network, and run CNA.  Attached is the screen shot of how the offending port is set up.

It connects to an HP 10NT Procurve hub on the other side via a fiber run. it looks like this leg runs in parallel with another fiber leg that is all running 100BT switch equipment, but this one run with older equipment is there because there are a number of computers running older fiber converters and no one has yet bothered to remove the old equipment from the equation.

As I am learning more . . . .I'm learning more.  I'm not too sure how relevant my earlier post is in terms of any network layout info.  I have discovered more of the story since last time.

Anyway,  this port goes into a fiber hub which, on the other end, goes into the HP procurve hub.  The only way I can get connectivity from devices on the other side of that hub is to set this port to   10BT and half duplex.  

The port does not always alternating orange/green.  But I'm sure it is when traffic is heavy.  I reset counter stats on that switch yesterday afternoon (it's a 24 hour operation).  Since then, the port in question has shown only 34 packets with errors and no discarded packets. But I'm sure things were a bit slower when I remoted in.  All other ports show no difficulties.

Thanks people for helping me out.  

9port.jpg
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MixmangleAuthor Commented:
Sorry but in my 4th paragraph above I say

Anyway,  this port goes into a fiber hub which, on the other end, goes into the HP procurve hub.  The only way I can get connectivity from devices on the other side of that hub is to set this port to   10BT and half duplex.  

What I meant ot say is

Anyway,  this port goes into a fiber patch panel which, on the other end, goes from patch panel into the HP procurve hub.  The only way I can get connectivity from devices on the other side of that hub is to set this port to   10BT and half duplex.  

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MixmangleAuthor Commented:
Once I realized what was going on with the older equipment, I was able to take them out of the equation altogether, so now there's no need for the half duplex. So, the problem went away.  I still wonder why the 3560 didn't show this problem but the newer 3560G did.
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