vWan in the same Region

Pierrick Morel 1 Reputation point
2022-01-30T17:10:56.353+00:00

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Azure Virtual WAN
Azure Virtual WAN
An Azure virtual networking service that provides optimized and automated branch-to-branch connectivity.
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  1. GitaraniSharma-MSFT 47,316 Reputation points Microsoft Employee
    2022-02-02T10:59:37.7+00:00

    Hello @Pierrick Morel ,

    Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

    Yes, it is possible to link the two ExpressRoute gateways to the same ExpressRoute circuit as shown in your diagram.

    However, there is a documented limitation in this setup regarding the inter-vHub VNet-to-VNet connectivity as below:

    When two hubs (hub 1 and 2) are connected and there is an ExpressRoute circuit connected as a bow-tie to both the hubs, the current behavior is to prefer the ExpressRoute circuit path over hub-to-hub for VNet-to-VNet connectivity (i.e. the path for a VNet connected to hub 1 to reach a VNet connected in hub 2). However, this is not encouraged in a Virtual WAN setup. To resolve this, you can do one of two things:

    1) Configure multiple ExpressRoute circuits (different providers) to connect to one hub and use the hub-to-hub connectivity provided by Virtual WAN for inter-region traffic flows.

    2) Contact the product team to take part in the gated public preview. In this preview, traffic between the 2 hubs traverses through the Azure Virtual WAN router in each hub and uses a hub-to-hub path instead of the ExpressRoute path (which traverses through the Microsoft edge routers/MSEE). To use this feature during preview, email previewpreferh2h@microsoft.com with the Virtual WAN IDs, Subscription ID, and the Azure region. Expect a response within 48 business hours (Monday-Friday) with confirmation that the feature is enabled.

    Kindly let us know if the above helps or you need further assistance on this issue.


    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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  2. Adam Stateman 1 Reputation point
    2022-09-23T13:43:44.877+00:00

    There is also a limitation with hub to hub comms where each hub is 'secured' Traffic flow is asymmetric and therefore dropped on return path. There is a video provided on alternative architectures by MS

    https://www.youtube.com/watch?v=YZ0EQDut6_8

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