[c-nsp] Spanning Tree Max VLAN's 35xx

[sthaug at nethelp.no]

> > What is the best way to filter out VLAN's headed to the device?  If I put
> > VLAN allow lists on the uplink ports does that do anything to limit the STP
> > instances or is all of that being carried by VTP to the switch regardless of
> > filters?  What about VTP Pruning on the VTP server?
> 
> We ran into this a lot.  What we finally did is to change all of our
> switches to  transparent mode (so basically disabled VTP).  You'd
> still have to go and manually delete all the unused VLANs after you make
> the change.  It may not work for you if you like the automation provided
> by VTP, but we prefer to just manually create the vlans we need on our
> switches. 

I work for a service provider, and we do basically the same. We look at
VTP as both unusable (because it forces the same VLANs on all switches)
and dangerous (a screwup on the VTP master can have major impact). VTP
pruning is out - we need to have explicit control over the VLANs on
every trunk.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no