MSTP and HP Procurve Network

I have a question. Is there any reason that MSTP would need to be configured over standard STP on a heterogeneous and flat HP procurve switched network with a couple of stray cisco access layer switches?
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Don JohnstonInstructorCommented:
You were okay until you said the "C" word (Cisco). ;-)

HP uses 802.1d STP.   Cisco uses a proprietary version which they call PVST+.  Unfortunately, they don't play very well together.  So on networks that I've worked on that have Cisco and just about any other vendor switches, I always configure 802.1s MSTP.

Now if you're absolutely certain that the Cisco switches will never ever ever be part of a loop, you could leave everything at the defaults (After all, spanning tree's only function is detecting and blocking loops). But if a loop should ever occur between those vendors switches, all bets are off.

If it were me, I'd configure MSTP.

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DaveKall42Author Commented:
So we will be reconfiguring this whole network from scratch.   About 60 switches.  I have heard its not too hard to do MSTP.  Any config pointers?  Just do one root with top priority and then the rest lower priority?
On a HP Procurve set a root switch with low priority (fx. 0) and a backup root fx. =1.
The default is 8.
These numbers are multiplied by 4096 compared to Cisco numbers.
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DaveKall42Author Commented:
So you are basically saying to set a root switch i.e.: core switch to 0 and then the rest of the switches at 1?
Don JohnstonInstructorCommented:
Well, you wouldn't typically set all the other switches to 1.  Just the switch that you would like to be the root should your primary fail.
DaveKall42Author Commented:
So your saying just set the root at 0 and another to 1 as backup and then just leave the rest?
Don JohnstonInstructorCommented:
It really all depends on the topology.  If you have redundant links, then you would want to specify which switch would be the backup root so the redundant link is properly utilized. If you have more than one redundant link, then you would define the next switch to be the root.

If you have no redundant links, then this is all moot as the root location is irrelevant.
DaveKall42Author Commented:
So if there aren't redundant links then it basically functions like any other STP?  Are you referring to redundant links to one switch like a ether channel link?
Don JohnstonInstructorCommented:

And non-etherchannel redundant links.
DaveKall42Author Commented:
If you were doing ether channel then how would you specify a switch to be a root and a backup?
Don JohnstonInstructorCommented:
Etherchannel doesn't impact STP configuration.
DaveKall42Author Commented:
I didn't think so. Thanks for all your great info and help!
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