[c-nsp] Maximum spannig tree instances

[Phil Mayers]

Jon Lewis wrote:
> On Tue, 14 Jul 2009, Geoffrey Pendery wrote:
> 
>> Yes.  We've verified this.
>> A trunk port carrying only VLAN 30, or even an access port carrying
>> only VLAN 30.
>> VLAN 30 is in instance 2.  You go into config mode and add VLAN 50 to
>> instance 2 (or remove it from instance 2)
>> The port, be it access or trunk, goes to blocking, learning, forwarding.
> 
> Well...screw that.  That would mean only making MST changes during 
> maintenance windows.  I guess it's time to turn off VTP and stick with 
> pvst.

Good choice.

MST is a junk standard. They missed a serious opportunity with it. But 
then it's the IEEE - frankly I'm amazed it didn't have a whacking great 
security hole in it.

R-PVST + manual VLAN management works like a charm here.