Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1
Fixed In:
12.1.3.3
Opened: Sep 25, 2017 Severity: 3-Major
A pool with a monitor configured as 'min 1 of {...}' may be unavailable when one or more members configured with FQDN are down, rather than remain available as long as at least one pool member remains up.
The pool may be seen as 'offline' when one or more members are down, rather than remaining available as long as a single pool member is 'UP'.
-- Pool nodes/members are configured with FQDN. -- At least one associated monitor is defined with the 'min 1 of {...}' feature.
To configure a pool with 'min 1 of{...}', specify static pool members, do not use FQDN to configure pool members.
A pool with FQDN configured nodes/members and specified with a monitor of 'min 1 of {...}' remains available as long as a single pool member remains up. This issue is resolved by the FQDNv2 feature re-implementation.