Bug ID 436682: Optical SFP modules shows a higher optical power output for disabled switch ports

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.5.1 HF1, 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, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.3 HF2, 11.4.1 HF9, 11.2.1 HF15

Opened: Nov 05, 2013

Severity: 3-Major

Related Article: K15987


Some optical SFP/SFP+ modules may continue to provide optical power output higher than the specified detection threshold when the port has been disabled. As a result, the remote connected device may indicate a false positive link state.


Link status may be incorrectly reported as up on remote connected device.


The SFP or SFP+ module switch port has been disabled on the BIG-IP system. The problem occurs due to the optical transmitter in the SFP/SFP+ module not being disabled when the switch port itself is in a disabled state. The problem may occur with certain optical SFP/SFP+ modules, including all or a subset of individual modules with the following part numbers: OPT-0010-00 (1G-SR) OPT-0011-00 (1G-LR) OPT-0016-00 (10G-SR) OPT-0017-00 (10G-LR) For a list of F5 supported Fiber Gigabit Ethernet SFP, XFP, SFP+ and QSFP+ modules, see SOL6097: Specifications of the Fiber Gigabit Ethernet SFP, XFP, SFP+ and QSFP+ module ports on BIG-IP system platforms, available here: https://support.f5.com/kb/en-us/solutions/public/6000/000/sol6097.html.


To work around this issue, when disabling an affected switch port on the BIG-IP system, you can also disable the connected port on the remote device.

Fix Information

Optical SFP/SFP+ modules now show the correct optical power output for disabled switch ports, which no longer attributes to false link states.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips