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NetGear switch takes multiple locations down when power loss

Posted on 2014-03-25
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Last Modified: 2014-03-27
I have a very small network using older NetGear FSM726 switches.  Very basic.  Whenever a specific location loses power, it causes other buildings to lose their network resources.  At a central location there are 2 NetGear switches with the gigabit fiber modules (2 each). Each of the fiber ports go to location 1 (Admin),2 (Streets),3 (Parks),4 (Golf). 1 & 2 are on the same switch. 3 and 4 are on the other switch and the two switches are uplinked with cable.  When #2 switch goes down, Locations 3, 4 and the central location cannot get to 1-Admin for mail, internet etc.  There is nothing programmed on the switch.  It is just one big switched environment connected by fiber.  What could possibly explain why one switch dropping can affect the rest?  Is there a setting on the switch?  It's like the chain is broken.  No vlans, no extra confg.
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Question by:cobmo
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Expert Comment

by:Aaron Tomosky
ID: 39956707
A -> 1 (admin)
^  -> 2 (streets)
|
|
B -> 3 (parks)
   -> 4 (golf)

do I have this right? I assume A->B uses the gigabit port
so when 2 goes down:3, 4, and B can't get to A or 1 right?

sounds like the fiber port may be shared with the gigabit or something so if the fiber has a problem, it takes out the gigabit. I don't know much about fiber, but the manual mentions specs like crossover, do you know if those guidelines are followed?
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Author Comment

by:cobmo
ID: 39956851
Yes
Switch A & B are in the same location using GBIC from the central location to the edge locations. 2 Netgear switches with 2 GBIS ports each for each location located at the central site where all the fiber converges.

When the Switch located at the Streets goes down, then Switch B cant get thru Switch A to get to resources from the central location.

Im investigating Spanning Tree settings.  The Streets switch had all ENABLED on the Spanning Tree menu and the central location switch where the gbic for Streets is plugged into did as well but no other switch on the network has Spanning Tree enabled.

Broadcast Storm?
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by:Aaron Tomosky
ID: 39959731
I don't think you need spanning tree at all for this setup. If you aren't using it, off is best.
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Author Comment

by:cobmo
ID: 39959938
Switch A was rebooted and things calmed down.  I see the spanning tree information out there on the web says do this do that but I dont really have a definite clarification on what it should be.  Should this be something configured on all ports for user devices and not the gbic ports, vice versa, or definitely not at all?
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Aaron Tomosky earned 2000 total points
ID: 39960042
Spanning tree allows you to connect more than one cable to the same place. Without stp it's a loop and everything goes down. The alternative is a LAG. I have never personally needed stp so I always turn it off everywhere.
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