Iam doing some testing in connecting a legacy network running Rapid PVST+ to our core network that runs MST.
The legacy network will have 2 links to the MST core network both as access ports. As expected one port goes into blocking. We then configured the 2 ports as trunks to give us more flexability but noticed that the boundary ports on the MST core connecting to the Legacy Rapid PVST+ network now negotiated to operate in legacy STP mode loosing the fast convergence of rapid PVST+.
Does anyone know why this is happening.
We have read the relevant RFCs and Cisco docs and can find nothing to explain what is happening.
Any feedback apreciated.