How to troubleshoot Private Peering connection issues?

Gerry Ultreras 20 Reputation points
2023-11-02T04:19:23.36+00:00

I have provisioned an Express Route and a private peering which shows as provisioned and enabled. I added a gateway connection, but traffic doesn't reach my Azure network. The resource health reports an Unavailable (Unplanned) message. I suspect a BGP connection issue, but the documentation shows layer 3 is managed by my provider. How can I troubleshoot this issue?

Azure ExpressRoute
Azure ExpressRoute
An Azure service that provides private connections between Azure datacenters and infrastructure, either on premises or in a colocation environment.
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  1. KapilAnanth-MSFT 39,446 Reputation points Microsoft Employee
    2023-11-07T14:20:38.92+00:00

    @Gerry Ultreras

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

    The basic troubleshooting steps are :

    • Firstly, please check the ARP status using ARP tables for private peering
      • Depending on the hardware platform, the ARP results may vary and only display the On-premises interface.
    • Then, if ARP is fine, check BGP. You can refer to this : Validate BGP and routes on the MSEE
      • And check if the BGP routes are being advertised properly between OnPrem and the Circuit.
    • Now, validate the VNET Gateway using Get-AzVirtualNetworkGatewayLearnedRoute
      • And make sure the VNET gateway is learning the route from circuit. (the origin type will be "EBgp" )
    • Additionally, you can also check if a VM in the VNET is learning the OnPrem route or not

    However, you confirmed there was a port down on your end.

    Thanks,

    Kapil

    Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.

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