管理器实例将IPsec信道交通路由到数据中心，并作为基于云计算的服务器之间的加密交换机。
The manager instances route the IPsec tunnel traffic to the data center and act as encrypted switches between the cloud-based servers.
每个末端节点都有叫做UNI的到所连接的交换机的一个特殊的信令信道。
Each end node has a special signaling channel to the connected switch called the UNI.
交换机与交换机之间也拥有叫做网间界面(NNI)的信令信道。
Switches have a signaling channel between them called the Network-to-Network Interface (NNI).
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