Bug ID 704282: TMM halts and restarts when calculating BWC pass rate for dynamic bwc policy

Last Modified: Oct 01, 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, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5

Fixed In:
14.0.0, 13.1.0.6, 12.1.3.6

Opened: Jan 30, 2018
Severity: 3-Major

Symptoms

Rarely, TMM halts and restarts when calculating the BWC pass rate for dynamic bwc policy.

Impact

Traffic disrupted while tmm restarts.

Conditions

-- Using BWC dynamic bwc policy. -- Fair share rate is low. For this to happen, the fair share rate of the instance of dynamic policy has to be less than than 32 times the average packet size of the instance of policy. For example, if the average packet size is 1 KB, then the fair share would be under 32 KB.

Workaround

F5 does not recommend running the BWC under 64Kbps. Either decrease the number of subscribers or increase the max-rate of dynamic policy.

Fix Information

TMM no longer halts and restarts when calculating the BWC pass rate for dynamic bwc policy when fair share rate is low.

Behavior Change