AA TCPO is an AA session filter configurable action that refers to a configurable TCPO policy.
Using this session-filter action, operators can optionally target some IP servers for optimization, or conversely exclude specific sites (servers IP addresses) from optimization.
Using the TCPO policy, the operator can select the TCP stack to be used toward the access network, as well as TCP congestion algorithm parameters, such as cwnd and the initial slow start threshold.
Operators can enable or disable Delayed ACK (DACK) as part of the TCPO configuration policy. However, DACK timeout is not configurable. It is set at 200 ms.
Operators have the option to enable TCPO for only those TCP flows that have a network side delay above a configurable threshold. This provides an option, for example, to disable TCPO for content that is colocated with the TCP optimizer.
In addition, operators can use the ADP action to abandon TCP optimization, which disables the TC optimizer for the flows that match the configured AQP match conditions, such as detected application and application groups. This provides a mechanism for the operator to target, or exclude, specific applications or application groups from undergoing TCPO.
TCP Selective ACK (SACK) is supported by AA TCPO if both the server and client negotiate SACK successfully.