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Can anybody direct me to a calculation of the maximum network diameter (number of devices) on an RSTP tree (RSTP, NOT STP)? As far as I can understand from the standard and the RFC, there is no such a limit as RSTP does not use timers. What is the maximum loop you have configured ?

Most (if not all) industrial switches all have proprietary protocols which improve convergence time, and most require physical port directionality configuration but I'm interested in plain RSTP.

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  • I deleted your opinion-based question.
    – Ron Trunk
    Jun 23, 2017 at 15:06
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    – Ron Maupin
    Feb 19, 2018 at 4:58

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There is no theoretical limit, but memory/CPU may impose practical limits on particular hardware. Depending on the topology, increasing the number of devices increases the convergence time. When that becomes a problem depends on your particular situation.

In my experience, loops tend to be small. I don't recall ever seeing a looped configuration larger than 3 or 4 devices.

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