Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.6.0, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2
Fixed In:
12.1.0, 11.6.1, 11.5.4 HF2
Opened: Apr 21, 2015 Severity: 3-Major Related Article:
K17334
The BIG-IP system may experience high CPU utilization when SSL/OpenSSL monitors are used to obtain availability status for 30 or more pool members.
High CPU utilization reported with potential performance degradation.
External SSL monitors using OpenSSL. This includes but is not limited to EAV, ldap, sip, soap, firepass, snmpdca, real-server, wmi, virtual-location. Builtin monitors are not affected, e.g., https, inband.
To work around this issue, you can use a different type of monitor to obtain pool member availability status. Impact of workaround: Performing the recommended workaround should not have a negative impact on your system.
The CPU utilization is reduced when SSL/OpenSSL monitors are used to obtain availability status for 30 or more pool members.