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articles/expressroute/expressroute-asymmetric-routing.md

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This article explains how network traffic might take different paths when multiple routes are available between network source and destination.
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> [!NOTE]
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> * This article discusses the issues that may occur with asymmetric routing in a network with multiple links to a destination. It is not a reference for designing a network with asymmetric routing because Microsoft doesn't recommend and support this architecture.
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> * This article discusses the issues that may occur with asymmetric routing in a network with multiple links to a destination. It should not be used as a reference for designing a network with asymmetric routing, as Microsoft does not recommend or support this architecture.
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There are two concepts you need to know to understand asymmetric routing. The first is the effect of multiple network paths. The other is how devices, like a firewall keep state. These types of devices are called stateful devices. When these two factors are combined, they can create a scenario in which network traffic gets dropped by the stateful device. The traffic is dropped because it didn't detect that the traffic originated from itself.

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