troubleshooting Question

VLAN assigments

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mynet asked on
NetworkingNetwork AnalysisNetwork Architecture
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I am new to vlan and I just have a few questions. I have two buildings, each with its own core, distribution, and access. But everything is in vlan1. I am in the process of redesigning the vlan infrastructure. All of layer 2 stop at the distribution layer. From the distribution to the core, it is all layer 3. So I keep the vlan within the building. The two building communicates via MPLS. My questions are:
- For the management vlan, let say vlan 300. Can I use the same management vlan for both building? Or they have to be different?
- Do the vlans have to be unique throughout my two building network? Let say I  have a user in building 1 with vlan 20 and and he moves to building 2 but still want to be in vlan 20. How will this work as there is a 1-to-1 mapping with vlan and subnet. In other words, I assign a subnet (vlan 20 = in my distribution switch. Now if he moves to building 2, how will I configure the distribution switch in building 2?

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