Bug ID 888341: HA Group failover may fail to complete Active/Standby state transition

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 16.0.0,, 16.0.1,

Fixed In:
16.1.0,, 15.1.3, 14.1.4, 13.1.4

Opened: Mar 09, 2020

Severity: 2-Critical


After a long uptime interval (i.e., the sod process has been running uninterrupted for a long time), HA Group failover may not complete despite an HA Group score change occurring. As a result, a BIG-IP unit with a lower HA Group score may remain as the Active device. Note: Uptime required to encounter this issue is dependent on the number of traffic groups: the more traffic groups, the shorter the uptime, e.g.: -- 1 floating traffic group: 2485~ days. -- 2 floating traffic groups: 1242~ days. -- 4 floating traffic groups: 621~ days. -- 8 floating traffic groups: 310~ days. -- 9 floating traffic groups: 276~ days. Note: You can confirm sod process uptime in tmsh: # tmsh show /sys service sod


HA Group Active/Standby state transition may not complete despite HA Group score change.


HA Group failover configured. Note: No other failover configuration is affected except for HA Group failover, specifically, these are not affected: o VLAN failsafe failover. o Gateway failsafe failover. o Failover triggered by loss of network failover heartbeat packets. o Failover caused by system failsafe (i.e., the tmm process was terminated on the Active unit).


There is no workaround. The only option is to reboot all BIG-IP units in the device group on a regular interval. The interval is directly dependent on the number of traffic groups.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips