Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5
Fixed In:
12.0.0, 11.6.0 HF6, 11.5.3 HF2
Opened: Jan 29, 2015 Severity: 2-Critical Related Article:
K17162
When a blade is enabled on a cluster while it is actively processing SIP UDP traffic, some packets might be lost.
Some SIP UDP traffic packets might be lost.
This occurs in an Active HA cluster containing VIPRION B2100 blades with the udp.hash value set to 'ipport' and client-side round robin TMM disaggregation enabled.
Do not enable a blade in a cluster while the blade is processing SIP UDP traffic.
Some SIP UDP connections are now retained after enabling a blade on the Active HA unit.
As part of this fix, there are two new DB variables: -- arp.gratuitousrate -- arp.gratuitousburst The functionality of these DB variables is documented in K11985: Overview of the arp.gratuitousrate and arp.gratuitousburst database variables :: https://support.f5.com/csp/article/K11985.