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,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,

Opened: Jun 21, 2017
Severity: 3-Major


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.


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


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


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


Behavior Change