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Fastest Spanning tree in multiple-ring topology

Hi everybody!

 

I have a topology in which there is the main ring and some nodes in the main ring have a minor ring. (see attachment please)
1- which STP configuration has the fastest convergence time? How would you configure spanning tree for all switches?
I think RSTP does the best, but Is there any other configuration to help convergence time?

2 - Does RSTP have any limitation? limitation In number of switches for instance? or incompatibility with other vendor's RSTP or spanning tree algorithm?

3- Is RSTP practical solution for this topology with a large number of switches? 45 switches as the main ring and more than 100 switches in minor rings?

4- Is there any other faster way, rather than spanning tree, to provide protection for this large network? 

 

Thank you all! 

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