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Manual Chapter: Setting Up a BIG-IP GTM Redundant System Configuration
Manual Chapter
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Overview: Configuring a BIG-IP GTM redundant system

You can configure BIG-IP Global Traffic Manager (GTM) in a redundant system configuration, which is a set of two BIG-IP GTM systems: one operating as the active unit, the other operating as the standby unit. If the active unit goes offline, the standby unit immediately assumes responsibility for managing DNS traffic. The new active unit remains active until another event occurs that would cause the unit to go offline, or you manually reset the status of each unit.

Task summary

Perform the following tasks to configure a BIG-IP GTM redundant system configuration.

Before you begin, ensure that the Setup utility was run on both devices. During the Setup process, you create VLANs internal and external and the associated floating and non-floating IP addresses, and VLAN HA and the associated non-floating self IP address. You also configure the devices to be in an active-standby redundant system configuration.

Defining an NTP server

Define a Network Time Protocol (NTP) server that both BIG-IP GTM systems use during configuration synchronization.
Important: Perform the following procedure on both the active and standby systems.
  1. On the Main tab, click System > Configuration > Device > NTP. The NTP screen opens.
  2. In the Address field, type the IP address of the NTP server.
  3. Click Add.
  4. Click Update.
During configuration synchronization, the systems use this time value to see if any newer configuration files exist.

Creating listeners to identify DNS traffic

Create two listeners to identify DNS traffic for which BIG-IP GTM is responsible. Create one listener that uses the UDP protocol and one that uses the TCP protocol.
Important: Perform the following procedure on only the active system.
Note: DNS zone transfers use TCP port 53. If you do not configure a listener for TCP the client may receive the error: connection refused or TCP RSTs.
  1. On the Main tab, click Global Traffic > Listeners. The Listeners List screen opens.
  2. Click Create. The new Listeners screen opens.
  3. In the Destination field, type the floating IP address of VLAN external. This is the IP address on which BIG-IP GTM listens for network traffic.
  4. From the VLAN Traffic list, select All VLANs.
  5. From the Protocol list, select UDP.
  6. Click Finished.
Create another listener with the same IP address, but select TCP from the Protocol list.

Defining a data center

Create a data center to contain the servers that reside on a subnet of your network.
Important: Perform the following procedure on only the active system.
  1. On the Main tab, click Global Traffic > Data Centers. The Data Center List screen opens.
  2. Click Create. The New Data Center screen opens.
  3. Type a name for the data center. Names must begin with a letter, and can contain only letters, numbers, and the underscore (_)character.
    Important: The data center name is limited to 63 characters.
  4. In the Location field, type the geographic location of the data center.
  5. In the Contact field, type the name of either the administrator or the department that manages the data center.
  6. From the State list, select Enabled.
  7. Click Finished.
You can now create server objects and assign them to this data center.
Repeat this procedure to create additional data centers.

Defining a server

Ensure that the data centers where the BIG-IP GTM systems reside exist in the configuration.
Perform this procedure twice to create two servers, one that represents the active system and one that represents the standby system.
Important: Perform the following procedure on only the active system.
  1. On the Main tab, click Global Traffic > Servers. The Server List screen opens.
  2. Click Create. The New Server screen opens.
  3. In the Name field, type a name for the server. Names must begin with a letter, and can contain only letters, numbers, and the underscore (_) character.
    Important: Server names are limited to 63 characters.
  4. From the Product list, select BIG-IP System (Redundant). The server type determines the metrics that the system can collect from the server.
  5. In the Address List area, add the IP address of the server.
    Important: You must use a self IP address for a BIG-IP system; you cannot use the management IP address.
  6. In the Address List area, add the IP addresses of the back up system using the Peer Address List setting.
    1. Type an external (public) IP address in the Address field, and then click Add.
    2. Type an internal (private) IP address in the Translation field, and then click Add.
    You can add more than one IP address, depending on how the server interacts with the rest of your network.
  7. From the Data Center list, select the data center where the server resides.
  8. From the Virtual Server Discovery list, select Disabled.
  9. From the Link Discovery list, select Disabled.
  10. Click Create. The Server List screen opens displaying the new server in the list.

Enabling global traffic configuration synchronization

Enable global traffic configuration synchronization options and assign a name to the global traffic synchronization group.
Important: Perform the following procedure on only the active system.
  1. On the Main tab, click System > Configuration > Global Traffic > General. The General configuration screen opens.
  2. Select the Synchronization check box.
  3. Select the Synchronize DNS Files check box.
  4. In the Synchronization Group Name field, type the name of the synchronization group.
  5. Click Update.
The settings you selected will be transferred to the standby system during configuration synchronization.

Running the gtm_add script

You must run the gtm_add script from the standby system.
Note: You must perform this task from the command-line interface.
  1. On the new BIG-IP GTM, log on to the command-line interface.
  2. Type gtm_add, and press Enter.
  3. Press the y key to start the gtm_add script.
  4. Type the IP address of the existing BIG-IP GTM, and press Enter.
The gtm_add process begins, acquiring configuration data from the active system; Once the process completes, you have successfully created a redundant system consisting of two BIG-IP GTM systems.
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