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You can implement the clustering of BIG-IP devices on a network through the use of the Equal Cost Multi-Path (ECMP) protocol. Specifically, you can enable ECMP on an upstream router and then configure the same virtual IP address on each BIG-IP device in a Sync-Only device group. In this case, the upstream router uses ECMP to determine, through route advertisement, whether there are multiple, equal-cost paths to the virtual address. If so, the router employs an algorithm to select a path to the virtual address on any one of the BIG-IP devices.
With this configuration, no single application is pinned to a specific device, and no device operates in a standby state. Instead, all devices in the cluster can be active for that application traffic. Moreover, you can add capacity by simply adding BIG-IP devices to the device group and syncing the configuration, including the virtual IP address, to the new device. Note that all devices in the Sync-Only device group function as standalone devices and therefore do not share state, such as mirroring connections, persisting records, and so on.
You can configure all-active BIG-IP clustering in these ways:
In the configuration example provided in this document, the pool members are on the internal network of the BIG-IP systems. However, because SNAT Auto Map selects the unique self IP address that is local to a device, the pool members can actually reside anywhere on the network, as long as they have a route back to those unique local self IP addresses.