Bug ID 1470021: Increased TMM memory usage on standby unit after it loses a connection

Last Modified: Mar 12, 2025

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.5.0

Opened: Dec 27, 2023

Severity: 3-Major

Symptoms

TMM memory usage on a standby BIG-IP device might be substantially higher than the active device.

Impact

The standby device may not be able to take over traffic when failover occurs.

Conditions

Standby device with UDP mirroring traffic and datagram-load-balancing disabled. The standby does not have the flow in its table from the start. This might be do to one or more of the following: - The aggressive sweeper expired the flow, but the flow was still valid on the active unit. - "tmsh delete sys connection" was run on the standby to remove a flow that was still valid on the active unit. - The configuration was initially out of sync and the active had "mirror enabled" while the standby had "mirror disabled" on the virtual server and the configurations were brought in sync during the lifetime of the connection on the active unit.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips