Bug ID 652223: BWC: Non-TCP data going through Category can make policy active

Last Modified: Dec 20, 2018

Bug Tracker

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

Known Affected Versions:
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, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4

Fixed In:
13.1.0

Opened: Mar 20, 2017
Severity: 1-Blocking
Related AskF5 Article:
K50325308

Symptoms

When category is set at lower rate than 100% of the user rate, and traffic going through the category is non-TCP, and the amount of data is 150% of the instance rate, then that can create policy to be active, lowering the overall bandwidth.

Impact

BWC dynamic policy cannot achieve 100% of max-rate.

Conditions

This occurs when all of the following conditions are met: -- Category rate is less than max-user-rate -- Traffic is non-TCP data. -- Amount of data passing is 150% of max-user-rate.

Workaround

Increase the max-rate of any dynamic policy, and add an additional static policy set to the max-rate expected from the dynamic policy. Note: There is no actual fix for this issue except for not using UDP traffic in categories, if the amount of traffic on that UDP category is expected to exceed 150%, or over to the maximum fair rate provided by the BWC instance. Note that the PEM subscriber and BWC instance have 1-1 relationship.

Fix Information

None

Behavior Change