Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP All
Known Affected Versions:
11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2
Fixed In:
12.0.0, 11.6.3.3, 11.5.6
Opened: Feb 17, 2015 Severity: 3-Major Related Article:
K13741128
If a trunk on a BIG-IP appliance or VIPRION chassis is populated with a number of members that is not a power of 2, the resulting distribution of egress traffic may be noticeably uneven. For example, in a VIPRION chassis with 3 blades each having 5 ports assigned to the trunk (total of 15 ports), one of the ports on one of the blades may send noticeably more traffic than the other ports.
Sub-optimal distribution of traffic across available trunk ports.
This problem occurs on the following F5 hardware platforms: -- BIG-IP 10000-series and 12000-series appliances. -- VIPRION B4300 and B2250 blades.
Configure the members of the trunk to always contain a number of members which is a power of 2 (2, 4, 8, 16).
Traffic distribution across a trunk with an odd number of members is more even.