Spanning-tree convergence times

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Nov 13th, 2009
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As a temporary solution to a problem I'm about to propose that we use one 1GB link between our two sites. As a backup we would use 2X 100MG etherchannel. If the Gig link were to fail how long would it take RSTP to reconverge?

The switches are currently using pvst. To change to rpvst is it just a case of entering spanning-tree mode command and if so is there anything I need to be aware of.

Many Thanks

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francisco_1 Fri, 11/13/2009 - 02:05
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For PVST you need to take in to conideration the timers suuch as by default Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec. If you are using backbonefast you can save a switch up to 20 seconds (max_age) when it recovers from an indirect link failure includding using uplink fast.

with RSTP these features are built in.

see this link for migration from pvst to rstp.


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