红帽全球峰会13.2. DVR 概述
分布式虚拟路由(DVR)提供了替代的路由设计。DVR 通过部署 L3 代理并在每个 Compute 节点上调度路由器，隔离 Controller 节点的故障域并优化网络流量。DVR 具有以下特征：
- 东西流量以分布式的方式直接在 Compute 节点上路由。
- 具有浮动 IP 的 North-South 流量在 Compute 节点上分发和路由。这要求外部网络连接到每个 Compute 节点。
- 没有浮动 IP 的 North-South 流量不分发，仍然需要专用 Controller 节点。
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Controller 节点上的 L3 代理使用
dvr_snat模式，以便节点仅服务 SNAT 流量。 - neutron 元数据代理在所有 Compute 节点上分发和部署。元数据代理服务托管在所有分布式路由器上。
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