Hi Pippin,
        In general case, you can run an agent on the compute node. The agent
can handle transactions sent by the controller node, when VMs 
destroyed/stopped/started.
Then, the agent will set/unset the tag of VMs according to information which be 
sent by the controller.
The VLAN of the VMs should be stored in the database. I think that the 
implementation of the tenant network 
using VLAN on OpenStack can provide you more information. 

Thanks,
nickcooper-zhangtonghao

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