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Merge pull request #242997 from rvandenbedem/patch-2
Removed references to SR for Private ASNs (unsupported).
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articles/azure-vmware/concepts-network-design-considerations.md

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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: 1/10/2023
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ms.date: 6/26/2023
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---
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# Azure VMware Solution network design considerations
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For AS-Path Prepend, consider the following:
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> [!div class="checklist"]
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> * The key point is that you must prepend **Public** ASN numbers to influence how AVS route's traffic back to on-premises. If you prepend using _Private_ ASN, AVS will ignore the prepend, and the ECMP behavior above will occur. Even if you operate a Private BGP ASN on-premises, it's still possible to configure your on-premises devices to utilizes Public ASN when prepending routes outbound, to ensure compatibility with Azure VMware Solution.
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> * The key point is that you must prepend **Public** ASN numbers to influence how Azure VMware Solution routes traffic back to on-premises. If you prepend using _Private_ ASN, Azure VMware Solution will ignore the prepend, and the ECMP behavior above will occur. Even if you operate a Private BGP ASN on-premises, it's still possible to configure your on-premises devices to utilize a Public ASN when prepending routes outbound, to ensure compatibility with Azure VMware Solution.
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> * Both or all circuits are connected to Azure VMware Solution through ExpressRoute Global Reach.
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> * The same netblocks are being advertised from two or more circuits.
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> * You wish to use AS-Path Prepend to force Azure VMware solution to prefer one circuit over another.
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> * Use either 2-byte or 4-byte public ASN numbers. If you don't own a public ASN for prepending, open a [Microsoft support ticket](https://ms.portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/~/overview) to explore further options.
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> * Use either 2-byte or 4-byte public ASN numbers.
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## Management VMs and default routes from on-premises
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articles/azure-vmware/faq.yml

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The only way to connect to Azure VMware Solution through ExpressRoute is for your environment and the on-premises ExpressRoute-carrier partners/ISPs support 4-byte ASN or have backward compatibility from 4-byte to 2-byte ASN in the BGP prefix ASN path advertisement.
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> [!NOTE]
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> Currently, private ASN (64512 - 65534) prepending from a customer on-premises environment isn't supported by Azure VMware Solution. This scenario might lead to intermittent connection drops from on-premises to Azure VMware Solution. To prepend a public ASN from on-premises, create a support request.
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> Currently, private ASN (64512 - 65534) prepending from a customer on-premises environment isn't supported by Azure VMware Solution. This scenario might lead to intermittent connection drops from on-premises to Azure VMware Solution.
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- question: What network IP address planning is required to incorporate private clouds with on-premises environments?
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answer: A private network /22 address space is required to deploy an Azure VMware Solution private cloud. This private address space shouldn't overlap with other virtual networks in a subscription or with on-premises networks.

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