[c-nsp] Divide large PVST domain?

[John Gaffney]

You could consider MST to reduce the number of STP instances. Sometimes that can increase efficiency. However what you are probably looking for is "spanning-tree diameter" command. If I recall that can make some auto adjustments to STP timers to accommodate for large switched networks.

You should also be aware that 20 switches connected in a straight line (hence middle switch) gives you a single point of failure. If it is truly a "train" of switches you could also not run STP - no ring/redundant link = no loop. 

- 

John


-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Raymond Burkholder
Sent: Tuesday, July 8, 2014 9:37 PM
To: 'cisco-nsp'
Subject: Re: [c-nsp] Divide large PVST domain?

> > I have a train of about 20 C3560X switches connected successively.
> > I know such a diameter is not good for STP, however, when I place 
> > the root bridge in the middle of the train, PVST still works more or 
> > less reliably.
> >

Or turn on some simple routing like rip, and make each switch a layer 3 subnet.  Layer 3 segmentation can be more reliable than layer 2 segmentation.


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