ASN number 65515 in the BGP advertisement for the VNet IP space towards the Expressroute peers

Difan Zhao 41 Reputation points
2022-01-23T18:21:09.7+00:00

When I checked the BGP table for the express route circuit, I see that I have the local ones (for the linked VNet IP space) has the ASN of 65515. Is it a hardcoded value just like 12076? I see that the ASN got removed when advertised to SP.
Thanks,
Difan

Azure VPN Gateway
Azure VPN Gateway
An Azure service that enables the connection of on-premises networks to Azure through site-to-site virtual private networks.
1,436 questions
Azure ExpressRoute
Azure ExpressRoute
An Azure service that provides private connections between Azure datacenters and infrastructure, either on premises or in a colocation environment.
342 questions
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  1. SaiKishor-MSFT 17,216 Reputation points
    2022-01-26T05:13:59.467+00:00

    @Difan Zhao Thank you for reaching out to Microsoft Q&A. I understand that you are having questions regarding BGP ASN 65515 with respect to Express Route circuit.

    "Microsoft uses AS 12076 for Azure public, Azure private and Microsoft peering. We have reserved ASNs from 65515 to 65520 for internal use. Both 16 and 32 bit AS numbers are supported."

    Since this ASN is for internal use, it will be removed during re-advertisement of Azure routes. Hope this helps.

    Please let us know if you have any further questions and we will be glad to assist you further. Thank you!

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