Bug ID 726176: Platforms using RSS hash reuse source port too rapidly when the FastL4 virtual server is set to source-port preserve

Last Modified: Jun 19, 2020

Bug Tracker

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 15.0.0, 15.0.1

Fixed In:
15.1.0, 15.0.1.1, 14.1.2.3, 13.1.3.2

Opened: Jun 29, 2018
Severity: 3-Major

Symptoms

The BIG-IP system running RSS DAG hash attempts to reuse ports while pool members remain in a TIME_WAIT state and are unable to process new connections.

Impact

Traffic throughput may be degraded.

Conditions

This issue occurs when all of the following conditions are met: -- You are running on a BIG-IP platform using RSS DAG hash, for instance, z100 and 2000 or 4000 series hardware platform -- You have the FastL4 profile associated with a virtual server. -- The virtual server is configured with source-port preserve.

Workaround

Set source-port to change.

Fix Information

Platforms running RSS DAG hash now reuse source port at the correct rate when virtual server sets source-port preserve.

Behavior Change