Last Modified: Apr 11, 2024
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2
Fixed In:
16.1.0, 15.1.4, 14.1.4.4
Opened: Aug 20, 2020 Severity: 3-Major
When using the in-TMM monitoring feature, monitored targets (nodes/pool members) may be marked DOWN unexpectedly if there is a delay in responding to ping attempts. Specifically, if the ping response from the target is delayed by more than the 'interval' value configured for the monitor, but less than the 'timeout' value configured for the monitor, the target may be marked DOWN.
The monitored target may be marked DOWN if it does not respond to ping attempts within the 'interval' value configured for the monitor, instead of within the 'timeout' value configured for the monitor.
This may occur when either: -- In-TMM monitoring is enabled (sys db bigd.tmm = enable) and the monitor type uses in-TMM monitoring; OR -- Bigd is configured to NOT reuse the same socket across consecutive ping attempts (sys db bigd.reusesocket = disable) AND: -- The monitored target does not respond to ping attempts within the 'interval' value configured for the monitor.
To work around this issue, use one of the following methods: -- Disable in-TMM monitoring and enable bigd socket reuse (sys db bigd.tmm = disable, and sys db bigd.reusesocket = enable). -- Configure the monitor with an 'interval' value longer than the expected response time for the monitored target(s).
With bigd.tmm = enable, the monitored target (e.g., pool member) is marked UP.