You'll note I stopped short of recommending you disable STP altogether, as it 
does prevent truly stupid problems like that.
What I said was, never design a network that deliberately uses STP as anything 
other than a last-ditch fail-safe.
-Adam


Nathan Eisenberg <[email protected]> wrote:

>> - LAG eliminates the need for spanning-tree.  Avoid STP in your network
>> if at all possible... Or rather, always design L2 networks so that
>> spanning tree has nothing to do, i.e. there are never multiple paths.
>> Note that each LAG is considered a single interface for STP purposes.
>
>Eh, I think you're dismissing STP way too readily.
>
>LAG eliminates the need for spanning tree *for those two ports*.  You still 
>need it if there's any possibility your users/noc crew/janitors might do 
>something silly like plug both ports on a Polycom VOIP phone into the wall 
>jacks.  Half of the reason that STP is a really good idea on access networks 
>is that it prevents BAD alternate paths.  I can't tell you how many networks 
>I've audited where STP has been keeping things running without anyone even 
>knowing about it.
>
>Nathan
>
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