There are two related network changes that I'll be making and I would like to check my understanding of the impact.
The first is just changing the STP prioirity of a production switch (S1). It's running RSTP with a priority of 40960 and has a 10Gb link to a core switch (R1), which is running MSTP with a priority of 32768. All other core switches upstream of S1 run MSTP with a priority between 0 & 32768. I'll be changing the priority on S1 to 61440.
Am I right in thinking that this should be entirely non-disruptive, or might there be some spanning-tree recalculation or reconvergence which might interrupt forwarding of traffic?
The second change is to create a redundant 10Gb link between S1 and a second switch (S2), which will in turn connect at 10Gb to a core switch (R2) in a different DC. S2 will be running MSTP with priority 40960, R2 has priority 0. R1 and R2 are directly connected via a 20Gb LAG.
The intention is that the new link will immediately be blocked and will remain so until S1 loses its connection with R1.
Would you expect any disruption to forwarding on S1 when the redundant link is made, or any disruption upstream?
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