I used to use rapid pvst on network , with a mix of rapid switches and some older switches running the old (802.1D?) pvst
anyway , i encountered a very big problem in that some switches could only do a maximum number of 128 spanning tree instances before they complain
so i migrated to MST to fix this issue , i have a question..
1) how do i know the max number of stp instances a switch can handle before it has a heart attack?
Also , if you run MST and you have some switches that run the older 801.2D pvst -- do they just have 1 spanning tree instance with the MST switches for all vlans?