-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
EA Louie
Sent: Saturday, October 20, 2001 12:43 AM
To: [EMAIL PROTECTED]
Subject: Re: Switching exam question [7:23497]


> so the risk of a bridge loop is better than a recalculation of spanning
tree
> ;->
>
sure, especially when you KNOW you're in a loop-free environment.

CL: never underestimate the probability that what you KNOW will not remain
true for long :->

of course, my motto is "spanning tree bridging, don't leave home without
it".

I've seen goofy things happen without spanning tree or with partial spanning
tree running in a looped environment.  (don't ask about 'partial spanning
tree' - I still can't figure out how they did that and why)  And I've seen
goofy things happen with spanning tree in big redundant environments,
especially with respect to not being able to control which ports get
disabled in a loop path.  The morale of the story there is the path you want
to have disabled (the redundant one between switches) will always be
enabled, and vice versa (as in the uplink to the router will be disabled).

CL: this probably explains why The Powers That Be spend so much time trying
to teach us how spanning tree works, and provide the ability to change
bridge priorities. CCIE types are SUPPOSED to draw out their diagrams, and
calculate the paths, and set the priorities so that the things you describe
don't happen. The truth is, most of us, CCIE or otherwise, just muddle
through. :->




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