Bug ID 585097: Traffic Group score formula does not result in unique values.

Last Modified: Mar 12, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(all modules)

Known Affected Versions:
11.2.1, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 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, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2

Fixed In:
13.0.0, 12.1.2 HF1, 11.6.1 HF2

Opened: Apr 04, 2016
Severity: 4-Minor

Symptoms

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.

Impact

When the problem occurs, Traffic Groups will be Active on multiple devices simultaneously. The problem can affect all Traffic Groups.

Conditions

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.

Workaround

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.

Fix Information

The Active device selection logic has been changed to deterministically choose the Active device location, even in cases with identical static scores.

Behavior Change