[c-nsp] Spanning tree 101

[Jee Kay]

Excuse me for being dense, but I can't find an answer anywhere in the
interweb...

Is there anything (apart from common sense) preventing me from having
L2 RPVST+ domains that have a radius larger than 7? The domain would
be spanning Catalyst 4000/4500s only.

(On a side note, is anyone running RPVST+ on Extreme switches and if
so do they speak happily to Ciscos running RPVST+?)

Thanks,
Ras