Bug ID 670331: 'No Pause' Switch MMU settings are incorrect for 5000/7000 series and Viprion B2100

Last Modified: Jan 20, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(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, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 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, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3

Opened: Jun 21, 2017
Severity: 3-Major

Symptoms

The default switch MMU settings used for 5000/7000 series and Viprion B2100 are intended for configuring 'no pause generation', i.e. a lossy switch mode. The default front panel interface flow-control settings are however set with TX-pause enabled, which causes some switch MMU settings to be partially set for a pause generation enabled mode.

Impact

The default interface flow-control settings may result in increased switch drop counts during periods of high traffic load.

Conditions

Default front panel interface flow-control settings used in a high traffic load environment.

Workaround

For 'no pause' operation, ensure that TX-pause flow-control on front panel interfaces are turned off, and the lossless mode DB setting (bcm56xxd.lossless.mode) disabled.

Fix Information

None

Behavior Change