Mirror Failover property

Adding a Mirror Failover property to domain lets you typically configure one or more data centers (typically two, a primary and a backup). GTM monitors the primary data center and as long as it is up will send users there.

Before you begin

You must have a domain to which you can add the property.

How to

  1. On the Traffic Management Domains page, select the domain for which you want to add a property and click Add New Property.
  2. Enter a name in the Property Name field. This is required.
  3. Select Mirror Failover from the Property Type list and enter the following information or accept the defaults:
    • Comments (optional)
    • DNS TTL
    • IP Type: select IPv4 or IPv6
    • Minimum Live Percentage (optional): The default behavior is that a data center is declared down when all the servers in it are declared down. This defines a minimum percentage of live servers in a data center, below which the data center will be declared down.
  4. Click Add To Change List & Next. The Traffic Targets page opens.
  5. Select the Data Center associated with a traffic target from the menu.
  6. Enter server names or IP addresses for each target.
    If a handout CNAME is given, traffic distributed to a traffic target will be sent to where the CNAME points. If servers are also given, liveness tests from these servers will be used to determine if the traffic target is available. If no server is given, this traffic target is always considered available. If you have more than one server name, separate them with commas, spaces, or line breaks.
  7. Click Set as Primary on a target to make it the primary traffic target.
  8. To add a new target at this stage, click Add New Target. If you do not have an available data center, a clone for an existing one is created.

    To enable or disable a target, use the slider. To remove a target, click X.

  9. Click Add To Change List & Next. The Liveness Test page appears.
  10. Enter the following information for at least one test, or click Skip to proceed to the Review page. You can create a test later. This example uses the HTTP protocol. Other protocols will have different or fewer fields to fill out. See Liveness Test for more information about these fields.
    • Enabled: Click the Enabled checkbox to allow (enable) the liveness test for the selected property. Uncheck the box to disable the liveness test for the selected property.
    • Test Name (required)
    • Test Interval
    • Test Timeout
    • Port: specify the port number for requesting the test object
    • Protocol: select a type from the menu (for example, HTTP, FTP, TCP)
    • Test Object Path (optional): only enter the local part of the URL for the test object (for example, /data/results/test.html)
    • HTTP Headers: select one or more HTTP headers from the drop-down menu and specify its value. Optionally, you can choose Other, which allows you to specify one or more customized HTTP headers. The customized header name must contain only letters, digits, hyphens, underscores, and dots. Blank spaces causes an error when you try to submit and validate the changes.

      Click the Validate HTTP Headers to verify the validity of the HTTP headers before saving the liveness test. A message displays only if HTTP header errors are detected.

      For more detailed information about HTTP Headers, see Liveness Test

    • HTTP/FTP errors: Select the responses you want to consider for server failures.
    • Authentication: If you are using password authentication, provide a username and password.
  11. Click Add To Change List & Next. The Review page appears.
    On the Review page you can view the basic property settings, traffic targets, and liveness tests and edit the settings if you want to make revisions.
    Note: Akamai uses the servers specified in the data center to determine if the traffic target is available. If the liveness test fails on all the servers in a data center, Akamai stops sending traffic to that data center. Also, if a handout CNAME is given, traffic distributed to a traffic target is sent to where the CNAME points. If servers are also given, liveness tests from these servers are used to determine if the traffic target is available. If no server is given, this traffic target is always considered available.
  12. Click Add To Change List. The Properties tab appears. A green check mark will appear next to the new property.
  13. Click Review Change List. The Change List Detail dialog appears.
  14. Review the Change List Detail dialog changes, validate them, add a required comment, and click Activate Domain to save them.
    For more information about the Review Change List Detail Dialog, see Change List Detail Dialog.