This implementation describes how to use the Setup utility to configure two new BIG-IP® devices that function as an active-standby pair. An active-standby pair is a pair of BIG-IP devices configured so that one device is actively processing traffic while the other device remains ready to take over if failover occurs. The two devices synchronize their configuration data and can fail over to one another in the event that one of the devices becomes unavailable.
First, you run the Setup utility on each device to configure base network components (that is, a management port, administrative passwords, and the default VLANs and their associated self IP addresses). Continue running it on each device to establish a trust relationship between the two devices, and create a Sync-Failover type of device group that contains two member devices.
After the Setup utility is run on both devices, each device contains the default traffic group that the BIG-IP system automatically created during setup. A traffic group represents a set of configuration objects (such as floating self IP addresses and virtual IP addresses) that process application traffic. This traffic group actively processes traffic on one of the two devices, making that device the active device. When failover occurs, the traffic group becomes active on (that is, floats to) the peer BIG-IP device.
By default, the traffic group contains the floating self IP addresses of the default VLANs. Whenever you create additional configuration objects such as self IP addresses, virtual IP addresses, and SNATs, the system automatically adds these objects to the default traffic group.
In this configuration example, the device group is named Device Group A. This device group contains two BIG-IP devices, named Device 1 and Device 2, and these two devices are peers of one another. The default traffic group, named traffic-group-1, resides on each device.
Device 1 actively processes traffic because traffic-group-1 is in an Active state on that device. Device 2 remains idle until failover occurs because traffic-group-1 is in a Standby state on that device.
Example active-standby configuration
By implementing this configuration, you ensure that:
The configuration process for a BIG-IP® system entails running the Setup utility on each of the two BIG-IP devices. When you run the Setup utility, you perform several tasks. Completing these tasks results in both BIG-IP devices being configured properly for an active-standby implementation.
You can use the Setup utility to discover a peer device for the purpose of exchanging failover and mirroring information.
To summarize, you now have the following BIG-IP® configuration on each device of the pair:
On either device in the device group, you can create additional configuration objects, such as virtual IP addresses and SNATs. The system automatically adds these objects to Traffic-Group-1.