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

Last Modified: Apr 28, 2025

Affected Product(s):
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: K08654415

Symptoms

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

Impact

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

Conditions

Enable SPDAG on VIPRION B2250 blades.

Workaround

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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips