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RSTP (Rapid Spanning Tree Protokoll) compatibility

Hello !

Is the rapid spanning tree protokoll compatible with an invironment of

older switches and root-switches that are not capable handling this new

protocoll.

We tested the STP-protokoll on this switches (it´s running).

Is it necessary to "build" VLAN´s to isulate the RSTP-Switches from the old

ones ?

Thank´s for any helpfull information.

Tom

2 REPLIES

Re: RSTP (Rapid Spanning Tree Protokoll) compatibility

According to the documentation on it, PVRST should be backwardly compatible with PVST or PVST+. You lose the pluses you get from using it when it hits these switches, but it should work on any directly connected switches that are also running PVRST...

Re: RSTP (Rapid Spanning Tree Protokoll) compatibility

Hi,

I wouldn't dare to say "it's 100% compatible".

If your core is running RSTP (including the STP root) and is surrounded by insulated edge switches running STP, there should be no problem. RSTP switch detects STP BPDUs on its port and communicates via STP BPDUs with the STP switch.

But I can imagine troubles when interconnecting two (or more) RSTP clouds through STP devices (i.e. mixing RSTP and STP devices together).

The different convergence speeds in RSTP and STP clouds might bring troubles in that case.

Regards,

Milan

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