Bug ID 662905: Rate class configured at very low rate (under packet size per second) cannot pass traffic.

Last Modified: Sep 06, 2019

Bug Tracker

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

Known Affected Versions:
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, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 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, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1

Fixed In:
13.1.0, 12.1.3.2

Opened: May 03, 2017
Severity: 4-Minor

Symptoms

When rate class is configured at very low rate (under packet size per second) the BIG-IP system cannot pass traffic.

Impact

The BIG-IP system does not pass traffic.

Conditions

-- BIG-IP 2000/4000 Series platforms. -- Rate class is configured at very low rate.

Workaround

Raise the rate class shaper rate so that the rate available to each tmm is larger than the expected packet size. Note: Rate class ceiling and rate are equally divided between each core, so the minimum bandwidth to pass traffic for 4 core system is 4(2 KB * 8) = 64 KB and for 8 core system it is 128 KB, making each core get about 2 KB per second. If the system is expected to pass jumbo packets, then the system must be configured accordingly.

Fix Information

None

Behavior Change