Bug ID 485232: Disabling and re-enabling an active blade in a HA group may result in the blade becoming standby

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,

Fixed In:
11.4.1 HF9

Opened: Oct 18, 2014

Severity: 3-Major

Related Article: K16514


Disabling and re-enabling an active blade in a HA group might result in the blade becoming standby.


After re-enabling a blade, it does not go active even though its mate blade is active. The standby blade does not take traffic.


This occurs when using HA group scoring with HA scoring weighted equally among peers. The peer must have its blades enabled.


Fail the system over to the peer by disabling its blades, then enable them and fail back (if desired).

Fix Information

When a blade is re-enabled, it checks to see if a mate blade is active. If a mate blade is active, the newly enabled blade will also go active.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips