Thats my understanding from MST instance 0, it's the Internal Spanning Tree (IST) instance, made available on MSTP to allow it to ineract with none MSTP switches. the instance 0 is simply an RSTP instance that makes the whole MST region to appear as one virtual bridge running Common Spanning Tree, to the outter world.
with that in mind i dont think creating vlans on instance 0 affects other instances of MST, but it might affect how the outter world interacts with the virtual bridge (IST).
Be advised that MST does not send different BDPU for different instances, all are IST BPDU with an MRecord for other instances, and this might result in unexpected topology for vlans mapped in instance 0 (IST). it is not advised to map vlans to instance 0 !
how do we restrict a router interfaces from directly connected to Some vlans? can any one help me to figureout?the question is Router should not have interfaces directly connected to Vlan 30 and Vlan 40
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