When you are configuring WAN optimization, you can avoid a single point of failure by setting up a pair of BIG-IP WOM devices in an active/standby configuration, in place of a single BIG-IP WOM device, on one or both sides of the WAN. To configure two BIG-IP WOM devices for high availability, set up redundancy as you would for any two BIG-IP systems, and then set up WAN optimization using the floating IP address as the WAN self IP address of the local endpoint for both BIG-IP WOM systems. For WAN optimization, you can use only the active/standby redundancy mode (not the active-active mode).
The following illustration shows an example of a redundant BIG-IP WOM configuration on one side of the WAN. For optimization to take place, you must also configure a BIG-IP WOM system on the other side of the WAN. As long as you configure an iSession connection across the WAN, it does not matter what configuration you choose for the BIG-IP WOM system on the other side.
This implementation describes how 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 can 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 will become active on (that is, float 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.
The configuration process for a redundant pair of BIG-IP WOM systems entails running the Setup utility on both BIG-IP WOM devices. Complete these Setup utility tasks to properly configure both BIG-IP WOM devices for an active/standby implementation on one side of the WAN.
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.