[c-nsp] backup with STP

[lists at hojmark.org]

> Our installation used instance 1 for odd and instance 2 for 
> even vlans (rooted on a pair of 6500's).

Yeah, odd/even is a very common setup. If that is the current
setup, I'd suggest changing it to low/high when moving to MSTP.

> 	instance 1 vlan 1,3,5,7,9,11,13,15 etc etc etc etc
> 	instance 2 vlan 2,4,6,8,10,12,14,16 etc etc etc etc
> 
> which was damn ugly.

ACK.

> Would be handy to have something like you do in a crontab
> 
> 	instance 1 vlan 1-499/2
> 	instance 2 vlan 2-500/2
> 
> or something.

ACK.

-A