Bug ID 530242: SPDAG on VIPRION B2250 blades might cause traffic imbalance among TMMs

Last Modified: Nov 22, 2021

Bug Tracker

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

Known Affected Versions:
12.0.0, 11.6.0, 11.5.4, 11.5.3, 11.5.2, 11.5.1

Fixed In:
12.0.0 HF3, 11.6.1 HF1, 11.6.1, 11.5.4 HF2

Opened: Jun 26, 2015
Severity: 3-Major
Related Article:


When SPDAG is turned on VIPRION B2250 blades, the traffic imbalance among TMMs might be observed.


The traffic imbalance can lower the throughput of VIPRION B2250 blades.


Enable SPDAG on VIPRION B2250 blades.


Adding or removing B2250 blades might mitigate the imbalance. If you are running BIG-IP versions 11.6.1 or 11.6.1 HF1, add the following to /config/tmm_init.tcl file: dag::use_p8_sp_hash yes

Fix Information

A new DAG hash is added for SPDAG on VIPRION B2250 blades, which can resolve the SPDAG traffic imbalance. The new DAG hash can be turned on by setting tmm tcl variable, dag::use_p8_sp_hash, to yes. Add the following to /config/tmm_init.tcl file: dag::use_p8_sp_hash yes

Behavior Change