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nexus/wiki/concepts/Overlay-Network.md
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---
title: "Overlay Network"
type: concept
tags:
- networking
- virtualization
---
## Aliases
- Overlay Network
- 叠加网络
## Description
叠加网络Overlay Network是在现有物理网络Underlay之上构建的逻辑网络用于实现复杂的路由和隧道功能。常见的 Overlay 协议包括 VXLAN、GRE、IPsec 等。在 SD-WAN 架构中Overlay 网络负责路径选择和流量调度,与底层的物理网络解耦。
## Use Cases
- SD-WAN 叠加网络
- 容器网络(如 Kubernetes CNI
- VPN 隧道
- 云间互联
## Related Concepts
- [[SD-WAN]]
- [[Hub-and-Spoke]]
## Related Entities
- [[AWS]]
## Sources
- [[ctp-topic-18-wide-area-networking-in-aws-cloud]]