Bug ID 554295: CMP disabled flows are not properly mirrored

Last Modified: May 14, 2019

Bug Tracker

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

Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 12.0.0, 12.0.0 HF1, 12.0.0 HF2

Fixed In:
12.1.0, 12.0.0 HF3, 11.6.1 HF1, 11.5.5, 11.4.1 HF10

Opened: Oct 26, 2015
Severity: 3-Major
Related AskF5 Article:


A client connection to a virtual server configured for 'cmp-enabled no' and 'mirror enabled' will be dropped if the standby unit is promoted to active.


Mirroring does not work as expected on BIG-IP appliances. Note: CMP is required on VIPRION chassis, so this expectation applies only to appliances.


The virtual server is configured for 'cmp-enabled no' and 'mirror enabled' on multiple BIG-IP appliances peered in a high availability configuration.


Do not disable CMP on virtual servers that are mirrored.

Fix Information

The system now supports mirroring connections between BIG-IP appliances in a high availability configuration on CMP-disabled virtual servers. Note: If CMP is disabled, hardware syn cookie must also be disabled for virtual servers to mirror connections. This is expected behavior.

Behavior Change