[c-nsp] purposefully mismatching native vlans

[sthaug at nethelp.no]

> I'm not asking rhetorically here, i'm hoping somebody can tell me why
> disabling spanning tree is so compelling.  I've seen a carrier with a
> bunch of Ethernet out toward their customers disable spanning tree, and
> I just dismissed it as goofy, but now with this thread I'm starting to
> wonder if its me that has it all wrong.

Here are a couple of reasons why you might not want to use spanning tree
towards your customers:

- It doesn't scale. Or at least per-VLAN spanning tree doesn't scale.
- You really don't want to mix customer STP traffic with your own STP
traffic, this is a recipe for disaster.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no