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Merge pull request #223509 from rvandenbedem/patch-42
Update concepts-network-design-considerations.md
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articles/azure-vmware/concepts-network-design-considerations.md

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@@ -3,7 +3,7 @@ title: Concepts - Network design considerations
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description: Learn about network design considerations for Azure VMware Solution
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ms.topic: conceptual
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ms.service: azure-vmware
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ms.date: 12/22/2022
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ms.date: 1/10/2023
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---
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# Azure VMware Solution network design considerations
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## Azure VMware Solution compatibility with AS-Path Prepend
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Azure VMware Solution is incompatible with AS-Path Prepend for redundant ExpressRoute configurations and doesn't honor the outbound path selection from Azure towards on-premises. If you're running two or more ExpressRoute paths between on-premises and Azure, and the listed [Prerequisites](#prerequisites) are not met, you may experience impaired connectivity or no connectivity between your on-premises networks and Azure VMware Solution. The connectivity issue is caused when Azure VMware Solution doesn't see the AS-Path Prepend and uses equal cost multi-pathing (ECMP) to send traffic towards your environment over both ExpressRoute circuits. That action causes issues with stateful firewall inspection.
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Azure VMware Solution is compatible with AS-Path Prepend for redundant ExpressRoute configurations with the caveat of not honoring the outbound path selection from Azure towards on-premises. If you're running two or more ExpressRoute paths between on-premises and Azure, and the listed [Prerequisites](#prerequisites) are not met, you may experience impaired connectivity or no connectivity between your on-premises networks and Azure VMware Solution. The connectivity issue is caused when Azure VMware Solution doesn't see the AS-Path Prepend and uses equal cost multi-pathing (ECMP) to send traffic towards your environment over both ExpressRoute circuits. That action causes issues with stateful firewall inspection.
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### Prerequisites
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