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3Com Spanning Tree

Posted on 2010-09-02
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Last Modified: 2012-05-10
We have 5 switch 3Com 3870 and 3 new 3Com (now hp) 4500G connected from first to last some by ethernet and others by fiber.

Now we want to connect last switch with the first one in order to give redundancy.

How do I configure the Spanning Tree on the 3870 and the 4500G?
Do I have to configure all switchs or only the last and the first?
What kind of configuration do I have to do?

Thanks
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Question by:Mikkk
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AndyEastham earned 2000 total points
ID: 33595569
Basically Spanning Tree Protocol is self configuring. You can create loops and STP will work out which links are redundant. Normally it will use the lowest cost link between nodes. If this link fails, it will automatically switch to the next lowest cost link.

All you need to do is make sure that STP is enabled on each switch that has multiple connections. I think 3com switches I've seen even come with STP enabled by default.You don't mention if you use VLANs - if you do, there may be a little more complexity.

When I first played with STPin a test network, I was astounded that it all "just worked" and you could connect multiple cables between multiple switches in all sorts of ways. Like you I think, intrinsically I thought this was a bad thing to do, and didn't initially trust it. But it really does work.

Best regards,

Andy
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