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---
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title: "Overlay Network"
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type: concept
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tags:
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- networking
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- virtualization
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---
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## Aliases
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- Overlay Network
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- 叠加网络
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## Description
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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。
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## Use Cases
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- SD-WAN 叠加网络
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- 容器网络(如 Kubernetes CNI)
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- VPN 隧道
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- 云间互联
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## Related Concepts
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- [[SD-WAN]]
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- [[Hub-and-Spoke]]
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## Related Entities
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- [[AWS]]
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## Sources
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- [[ctp-topic-18-wide-area-networking-in-aws-cloud]]
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