STP Default setup

If I understand STP prevents network loops on Cisco Switches.
Since it is that important, I wonder if it is enabled by default on Cisco Switches.

If it is enabled by default, does that mean if we connect 2 switches with multiple cables there is no worry about loops to happen ?

Thanks
jskfanAsked:
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Don JohnstonConnect With a Mentor InstructorCommented:
If you've saying that since spanning tree is on by default and no loop can occur, then why can it be configured.  The answer is to optimize it's configuration. But you "know you can tune it."

I'm sorry, but I don't see what the question is.
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Don JohnstonConnect With a Mentor InstructorCommented:
I wonder if it is enabled by default on Cisco Switches.
Yes, it is.

If it is enabled by default, does that mean if we connect 2 switches with multiple cables there is no worry about loops to happen ?
That is correct.
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jskfanAuthor Commented:
so if it is enabled by default….and we do not have to worry about Network loops to happen…why it is big deal?
All they need to do is to make it hard coded so that noone can disable STP accidentally..
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Don JohnstonInstructorCommented:
On some platforms, it can't be disabled. But even if it coundn't be disabled, it can be mis-configured.

And a broadcast storm can bring down the entire network.
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Craig BeckConnect With a Mentor Commented:
The default configuration isn't optimal - it's a fail-safe.  If you use it in a production network it probably won't provide you with great performance.  It might be ok to use if you want to connect a couple of switches, but in a large network it's not something you'd want to do.
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jskfanAuthor Commented:
craigbeck:

can you please illustrate your comment ?

Thanks
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Don JohnstonInstructorCommented:
Personally, I can easily spend a day talking about STP tuning.  Root bridge placement, STP version selection, Root Guard, BDPU Guard, etc.  In a multi-switch, production environment, these are all things that should be tweaked.

Can you be more specific as to what you want?
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jskfanAuthor Commented:
I know you can Tune it …
I want to know out of the box(Assuming STP is enabled)..then there is no Loop to concern ourselves about ?
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Craig BeckCommented:
Are you asking why it's not optimal 'out-of-the-box'?
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jskfanAuthor Commented:
I guess I got it..
Thank you Guys !
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