Bug ID 746861: SFP interfaces fail to come up on BIG-IP 2x00/4x00, usually when both SFP interfaces are populated

Last Modified: Oct 10, 2023

Affected Product(s):
BIG-IP Install/Upgrade, LTM(all modules)

Known Affected Versions:,,,, 13.1.4,, 13.1.5,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,

Fixed In:
16.0.0, 15.1.4,

Opened: Oct 15, 2018

Severity: 3-Major


The SFP interfaces do not come up, or they flap up and down repeatedly on BIG-IP 2000/4000 on boot up when both SFP interfaces are populated. When interface flaps state changes such as those below are logged in ltm log: info pfmand[PID]: 01660009:6: Link: 2.1 is UP info pfmand[PID]: 01660009:6: Link: 2.1 is DOWN


Traffic cannot be sent/received from these interfaces.


Both SFP interfaces, 2.1 and 2.2, on BIG-IP 2000/4000 are populated. This is typically observed on boot up after an upgrade to an affected version. And this may occur during normal reboot


Disconnect and reconnect the cable.

Fix Information

The interfaces now come up successfully. Occasional link bounce may be seen on reboot.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips