F5 LTM LB method equivalent to Alteon Hash

Below is the Description of HASH Load balancing on the Alteon Hash

The hash metric uses IP address information in the client request to select a server. The specific IP address information used depends on the application:

All requests from a specific client will be sent to the same server. This option is useful for applications where client information must be retained between sessions.

When selecting a server, a mathematical hash of the relevant IP address information is used as an index into the list of currently available servers. Any given IP address information will always have the same hash result, providing natural persistence, as long as the server list is stable. However, if a server is added to or leaves the set, then a different server might be assigned to a subsequent session with the same IP address information even though the original server is still available. Open connections are not cleared.