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Cisco SGE2000P switches keep going down.

Posted on 2013-05-17
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Last Modified: 2013-10-11
I have two stacks of SGE2000P switches in my building the two stacks are connected by a fiber cable. My main stack 1 keeps going down once a day maybe twice a day for a short amount of time. When I mean down I dont mean they shut off or anything all lights are on and blinking but all the devices on the stack go down for 30 seconds to a minute and a half. There are no logs within the switch saying that anything went down, but my SNMP server shows that the stack went down. For example yesterday it shows it went down from 12:14 AM till 12:15 AM for a total of 31 seconds total. I see stack two go down as well but I cant say its going down for any reason other than stack 1 going down first because that is the traffic path.

I am not sure what to do to try to daignose the problem.
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Question by:Keef4000
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4 Comments
 

Author Comment

by:Keef4000
ID: 39175200
Could Jumbo frame be causing these issues?
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Accepted Solution

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Craig Beck earned 2000 total points
ID: 39177577
30seconds says to me that you probably have a Spanning-Tree issue - most likely one of the fibre ports has dropped momentarily and is going from the listening, to learning to forwarding state.

It is unlikely that you have a loop between your stacks, but you should check that no loops exist on any of the stacks at user ports, for example.
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Author Comment

by:Keef4000
ID: 39185978
I actually have 3 stacks of switches in three different buildings both child stacks are connected to the main stack via fiber cable. I honestly forgot about the third one until your post. I'll check out the STP and see what I can see there. Simply reducing the STP value on the child stacks should fix an STP error correct?
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Author Closing Comment

by:Keef4000
ID: 39565591
Spanning Tree was the issues. Thanks
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