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AD sites and Network Speed

Oliver Dickerson 1 Reputation point
2021-04-26T17:54:29.127+00:00

Microsoft says "Sites are Active Directory objects that represent one or more TCP/IP subnets with highly reliable and fast network connections." I am curious what is the generally accepted definition of "FAST"?

What is the slowest link between DC(sites) that is considered acceptable for an AD site boundary?

Moreover has anyone created an AD site that spans multiple physical locations or Azure with link speeds in the 30-40ms range?

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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Windows Network
Windows Network
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.Network: A group of devices that communicate either wirelessly or via a physical connection.
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  1. Daisy Zhou 24,741 Reputation points Microsoft Vendor
    2021-04-27T06:42:44.577+00:00

    Hello anonymous user,

    Thank you for posting here.

    Here are the answers for your reference.

    Microsoft says "Sites are Active Directory objects that represent one or more TCP/IP subnets with highly reliable and fast network connections." I am curious what is the generally accepted definition of "FAST"?
    A: Basically, it is a local area network, the network is reliable, the link speed is good, and it is not easy to be interrupted.

    What is the slowest link between DC(sites) that is considered acceptable for an AD site boundary?
    A: The slowest link is 500 (Kbps).

    Group Policy Slow Link Detection using Windows Vista and later
    https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/group-policy-slow-link-detection-using-windows-vista-and-later/ba-p/397210

    Moreover, has anyone created an AD site that spans multiple physical locations or Azure with link speeds in the 30-40ms range?
    A: If you create such site, and link speeds in the 30-40ms range is your accepted range based on your own network speed, you can configure and keep such site.
    If you create such site, and link speeds in the 30-40ms range is not your accepted range based on your own network speed, you may not need to configure and keep such site.

    Hope the information above is helpful.

    Should you have any question or concern, please feel free to let us know.

    Best Regards,
    Daisy Zhou

    ============================================
    If the Answer is helpful, please click "Accept Answer" and upvote it.

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  2. Oliver Dickerson 1 Reputation point
    2021-05-05T14:24:22.663+00:00

    Than you for your response. I believe rather than create a cross-location AD site, we're going to try the "instant replication" setting for the site link to Azure using ADSIEDIT.

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