Bug ID 470394: Priority groups may result in traffic being load balanced to a single pool member.

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.4.0, 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, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.1 HF6

Opened: Jul 04, 2014
Severity: 3-Major
Related AskF5 Article:
K16242

Symptoms

Priority groups may result in traffic being load balanced to a single pool member.

Impact

Traffic is improperly load balanced.

Conditions

This occurs when the following conditions are met: -- Multiple priority groups. -- Slow ramp feature enabled (TCP profile). -- Active priority group goes offline. -- Member in the newly active group goes offline then online (triggering slow ramp feature).

Workaround

Disable slow ramp feature in the TCP profile.

Fix Information

The BIG-IP system calculates the correct number of members in the active priority group when the slow ramp feature is triggered.

Behavior Change