I have VSTP confiured on a EX4600 that has multiple routing instances. I have VSTP configrued at what I assume is the global switch level (ie "edit protocols vstp") and it appears to be working fine. However, I have just noticed that there is also the capability to configure spanning tree within routing instances by using "edit routing-instance <instance name> protocols vstp".
What is the difference between configuring STP at the global switch level vs configuring within the routing instance? Am I configuring STP wrong, should I be configuring under the routing instances?