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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

SOLUTION

Don Johnston

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jskfan

ASKER

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..

Don Johnston

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.

SOLUTION

Craig Beck

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jskfan

ASKER

craigbeck:

can you please illustrate your comment ?

Thanks

Don Johnston

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?

jskfan

ASKER

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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Don Johnston

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Craig Beck

Are you asking why it's not optimal 'out-of-the-box'?

jskfan

ASKER

I guess I got it..
Thank you Guys !