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There won't be any change to the existing CloudStack workflow. In a typical deployment, when an Isolated Network is created and the first VM is attached to it, the Network is allocated a VLAN ID. This VLAN will be configured on the switches as well.
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To orchestrate Juniper's switches, the plugin leverages Network-Director API which is a JUNOS space application for configuring juniper equipment. It uses NETCONF protocol to control the juniper device configuration and exposes REST APIs for integration with other application. The plugin also has the ability to directly orchestrate the Juniper's switches using NETCONF protocol.
The plugin introduces a new class called JuniperNetworkGuru which extends the GuestNetworkGuru (of Cloudstack) and extends the implement() method to orchestrate the Juniper's switches.
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