Bug ID 527537: CGNAT experiences increased CPU utilization with a high concurrent connection load and persistence enabled

Last Modified: Nov 07, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP CGN(all modules)

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6

Opened: Jun 11, 2015
Severity: 3-Major


Elevated CPU with CGNAT when carrying the same load between 11.5 and 11.6


Elevated CPU = reduced capacity


CGNAT lsn-pools high number of concurrent connections persistence = address-port and/or inbound enabled



Fix Information

Change the sessionDB sweeper to reduce the amount of work it does managing large bins.

Behavior Change