Bug ID 613673: Pool members may not be marked up and/or there might be a slight delay in monitors

Last Modified: Oct 01, 2018

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
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, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:
11.6.1 HF2

Opened: Aug 31, 2016
Severity: 3-Major
Related AskF5 Article:
K48693281

Symptoms

A UDP monitor might fail to mark a pool member up even when the pool member is up. Other monitor types may mark a pool member down. A slight delay (less than 0.1 seconds) might be noticed in monitor traffic sent by the BIG-IP.

Impact

Incorrect pool member status or pool member flapping. Connections to monitored pool members might last slightly longer than necessary.

Conditions

To experience the incorrect pool member status issue, there is generally some other monitor on the system that is legitimately down. To experience the delay, run an affected version. The issue has been observed with TCP, HTTP, and HTTPS monitors.

Workaround

None.

Fix Information

In this release, the system now correctly sets pool member status and connections to monitored pool members no longer last longer than necessary.

Behavior Change