Creating Layer 3 Connections to Azure

Updated by CoreSite


  1. Follow Steps 1 to 4 in the “ordering OCX services” section to navigate to the Port ordering page.
  2. Click on the “EVC” tile and click “continue”.
  3. On the next screen, select the tile that displays “Connect to a service provider or other OCX participant”.
  4. Select the tile that displays “Connect to a Service provider” and click “Continue”.
  5. Next, select the tile labeled “Layer 3 Connection”. Click “Continue”.




Part 1: Fill out the required data fields in the EVC order form:

  1. Select Provider you wish to connect to. In this case select Microsoft Azure.
  2. Select the Target Location
  3. Select the Target Port
  4. Enter your (ExpressRoute) Service Key
  5. The Peering Type will be defaulted to Private Peering. CoreSite OCX currently does not support Microsoft Peering (Public)
  6. Select Buyer Account
  7. Select the desired Virtual Router
  8. Provide a unique name for your EVC
  9. (Optional) Specify an Invoice Label
  10. Specify the service rate desired
  11. Click the “Validate and Continue” button to procced


Part 2: Complete the Layer 3 Peering and Credentials Details:

  1. Provide the New Cloud Subnet in CIDR Format
    1. Please note – a /27 subnet or larger is required for all Microsoft Azure VNETs.
  2. Provide your Client ID
  3. Provide your Client Secret Value
  4. Provide your Subscription ID
  5. Provide your Tenant ID
  6. Provide the Resource Group Name
  7. Select the Resource Group Region
  8. Provide the ExpressRoute Circuit Name

Part 3 (Optional): Provide prefix details. You may enter up to 100 prefixes:

  1. Select the policy you wish to apply to the prefix.
  2. Provide the peer network address in CIDR form.
  3. Select the desired range: “Exact” or “Range”:
    1. If you select range, provide the “Start” and “End” of the range.
  4. 4.       Repeat steps 1-3a for any additional prefixes provided:
    1. Click the “+” button to add more prefixes.
  5. Click “Review Order”.

Part 4: Add contact information and review your order:

  1. Enter valid contact information for this request.
  1. Review all data parameters associated with the EVC Request. If any information is incorrect or changes need to be made, users may click the “Back” button and make the necessary changes.
  2. After confirming all information is accurate check the Terms and Conditions check box.
  3. Click “Submit Order”.


After completing Step 4 the order will be submitted, and automated provisioning will begin. No other action is required at this time.

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