Bug ID 1504149: F5OS to F5OS LACP link aggregation flaps when both aggregations are configured as PASSIVE

Last Modified: Oct 19, 2025

Affected Product(s):
F5OS F5OS, F5OS-A, F5OS-C, Velos(all modules)

Known Affected Versions:
F5OS-A 1.2.0, F5OS-A 1.3.0, F5OS-A 1.3.1, F5OS-A 1.3.2, F5OS-A 1.4.0, F5OS-A 1.5.0, F5OS-A 1.5.1, F5OS-A 1.5.2, F5OS-A 1.5.3, F5OS-A 1.5.4, F5OS-A 1.7.0, F5OS-A 1.8.0, F5OS-A 1.8.3, F5OS-C 1.1.4, F5OS-C 1.2.1, F5OS-C 1.2.2, F5OS-C 1.3.1, F5OS-C 1.3.2, F5OS-C 1.5.0, F5OS-C 1.5.1, F5OS-C 1.6.1, F5OS-C 1.6.2, F5OS-C 1.6.4, F5OS-C 1.8.0, F5OS-C 1.8.1, F5OS-C 1.8.2

Opened: Feb 05, 2024

Severity: 3-Major

Symptoms

LACP link aggregation will flap.

Impact

Traffic on the link aggregation is disrupted.

Conditions

Two directly linked F5OS systems with an LACP link aggregation managing the link. Both F5OS systems have the aggregation configured for PASSIVE LACP.

Workaround

Configure one or both F5OS LACP link aggregations to be lacp-mode ACTIVE.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips