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Cisco SG200-50P Server up / down on port


I'm working with the following:

Closet A:

SG200-50P firmware

3550-24XL trunked to it over copper.

Server Room:

SG200-50P firmware

3548XL trunked to it over copper.

Server Room SG200 and Closet A SG-200 are trunked across fiber.

Server Room SG200 is set to root bridge.  STP mode classic.  Path cost: short. (because these SG200 switches are trunked to some older models that docs indicate do not support rapid mode.)

VLAN 1 data 192.168.1.x

VLAN 2 voice 192.168.203.x

Green Ethernet features disabled.

Main Issue:

Server hooked up to port GE17 in Server Room SG200 goes up and down.  The users report losing telnet sessions to server and getting kicked.  Remote management interface on server locks.  A few moments later it is on again.  Pinging it, the repsonse times are fine then about every ten minutes it has a fit and will not respond to any pings for about 10-20 seconds.  Then it's good again.   

I checked in the switch logs and I do not see the interface flapping.  It's like it just stops passing trafffic on that interface and then resumes.

I have tried the following after updating to the latest firmware and turning off green Ethernet and misc. suff:

1.  Verified NIC is in fact 1000 Mbps - yes.

2.  Replace patch cable - goes direct from server to switch port - No difference.

3.  Set switch port to 1000 and full duplex instead of auto.  No difference.  Stepped down to 100 and full instead of auto.  No difference.

4.  Disabled spanning tree on port and set to BPDU filtering.  No difference.

5.  Enabled storm protection on all the ports.  No difference.

I confirmed with the customer that this server (Unix) has been running for a number of years ok.  However, these SG200s are new and previously it was operating on another switch in a different building.

I have thought to put this server in the 3548XL and see what happens but I'm not onsite or near there now so I can't move the cable. 

I was wondering if there is something else to check on the SG200 to see what is happening?

The customer has reported that other servers and workstations are also doing this behavior. 

At first I thought it was just a problem with  the server but since he reports that other servers go on and offline (windows, unix, etc.) and the only thing they have in common is all being in this new SG200, I thought perhaps there was something with this model or a config settings I should check.

Here is a screen of what the pings look like:


Here is system summary screenshot:



As reported above, the SG200 in the server room does not show ports flapping when looking at the RAM log under Status - View Log.

However, the SG200 in Closet A sure does.   Any ideas?  It just workstations and printers plugged into it.

2147483546   2013-Aug-01 21:17:38 Informational   %LINK-I-Up:  gi25       

    2147483547   2013-Aug-01 21:17:37 Warning   %LINK-W-Down:  gi25       

    2147483548   2013-Aug-01 21:17:33 Warning   %STP-W-PORTSTATUS: gi31: STP status Forwarding       

    2147483549   2013-Aug-01 21:17:28 Informational   %LINK-I-Up:  gi31       

    2147483550   2013-Aug-01 21:17:27 Warning   %LINK-W-Down:  gi31       

    2147483551   2013-Aug-01 21:17:04 Warning   %STP-W-PORTSTATUS: gi2: STP status Forwarding       

    2147483552   2013-Aug-01 21:16:59 Informational   %LINK-I-Up:  gi2       

    2147483553   2013-Aug-01 21:16:58 Warning   %LINK-W-Down:  gi2       

    2147483554   2013-Aug-01 21:16:45 Warning   %STP-W-PORTSTATUS: gi12: STP status Forwarding       

    2147483555   2013-Aug-01 21:16:41 Informational   %LINK-I-Up:  gi12       

    2147483556   2013-Aug-01 21:16:39 Warning   %LINK-W-Down:  gi12       

    2147483557   2013-Aug-01 21:13:40 Warning   %STP-W-PORTSTATUS: gi30: STP status Forwarding       

    2147483558   2013-Aug-01 21:13:36 Informational   %LINK-I-Up:  gi30       

    2147483559   2013-Aug-01 21:13:34 Warning   %LINK-W-Down:  gi30       

    2147483560   2013-Aug-01 21:12:21 Warning   %STP-W-PORTSTATUS: gi27: STP status Forwarding       

    2147483561   2013-Aug-01 21:12:17 Warning   %STP-W-PORTSTATUS: gi36: STP status Forwarding       

    2147483562   2013-Aug-01 21:12:16 Informational   %LINK-I-Up:  gi27       

    2147483563   2013-Aug-01 21:12:14 Warning   %LINK-W-Down:  gi27       

    2147483564   2013-Aug-01 21:12:12 Informational   %LINK-I-Up:  gi36       

    2147483565   2013-Aug-01 21:12:11 Warning   %LINK-W-Down:  gi36       

    2147483566   2013-Aug-01 21:12:02 Warning   %STP-W-PORTSTATUS: gi11: STP status Forwarding       


Cisco SG200-50P Server up / down on port

I hope this is not the case for you, but I had a bad SG500 switch that had ports going up and down like this and had to be replaced.  There is another thread somewhere I saw where some other users have had similar issue.

Are the switches new?  I would not hesitate to call SBCS support and get them to look at it.

Good luck.

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