MSTP treats neighbors differently on access ports and trunks - why?

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Jul 10th, 2010
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Dear friends,


I have been recently playing with MSTP more closely, trying to get better under its hood, and one issue surprised me: when a MSTP-enabled switch detects a RSTP neighbor on an access port, it speaks to it using RSTP as expected. The same behavior can be observed if the neighbor is another MSTP switch that belongs to a different region - the two switches fall back to using RSTP on the link.


However, if the link interconecting the two switches is a trunk then the MSTP reverts to PVST+ operation, not to RPVST+ as I originally expected. Is there any reason for that?


Thank you very much for all your insight!


Best regards,

Peter

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Peter Paluch Fri, 09/03/2010 - 09:34
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Dear friends,


I am bumping this topic shamelessly Does anyone have a clue about this behavior? Thanks to anyone!


Best regards,

Peter

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