Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
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, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.2.1, 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, 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
Fixed In:
13.0.0, 12.1.2 HF1, 11.6.1 HF2
Opened: Apr 04, 2016 Severity: 4-Minor
In certain configurations, the Traffic Group score for a particular Traffic Group can be identical across devices in a device service cluster, resulting in the Traffic Group becoming Active on more than one device simultaneously.
When the problem occurs, Traffic Groups will be Active on multiple devices simultaneously. The problem can affect all Traffic Groups.
The score is derived from the management-ip and other factors. If the device management-ips are not on the same /24 subnet, the score is not guaranteed to be unique. The score can be observed with the tmsh "run cm watch_trafficgroup_device" command, and in some versions of BIG-IP, the "show cm traffic-group" command.
The only solution is to change the management-ip on one of the colliding devices. The workaround is not practical with DHCP, and in many other situations.
The Active device selection logic has been changed to deterministically choose the Active device location, even in cases with identical static scores.