Last Modified: Jun 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
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, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 17.0.0, 17.0.0.1, 17.0.0.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.5.0, 17.5.1
Opened: May 24, 2024 Severity: 4-Minor
If an LTM monitor is created with an alias address configured and assigned to a pool or pool member(s), then the monitor's "transparent" attribute is changed (either from enabled to disabled, or from disabled to enabled), the monitor no longer appears in the Local Traffic GUI in the "Health Monitors" list for an affected pool member.
The assignment of the monitor to the pool member is not immediately visible in the BIG-IP LTM GUI in the "Health Monitors" list for the affected pool member(s). When viewing the properties of the pool member in the Local Traffic GUI, if the "Advanced" Configuration view is selected, the Health Monitors assigned to the pool member can be viewed. If the "Inherit from Pool" option is configured, the Health Monitors assigned to the pool can be viewed under the Properties tab for the pool.
This occurs when all of the following conditions are true: -- An LTM health monitor is configured with an Alias Address and/or Port (Destination field in TMSH) -- The monitor is assigned to an LTM pool and/or pool member(s) -- The monitor's Alias Address and/or Port are different from the address of the assigned pool member -- After the monitor is assigned to the LTM pool and/or pool member(s), its "transparent" attribute is changed (either from enabled to disabled, or from disabled to enabled) -- The list of Health Monitors assigned to a given pool member is viewed in the BIG-IP LTM GUI (Local Traffic --> Pools : Pool List --> select pool --> Members --> select member)
When viewing the properties of the pool member in the BIG-IP LTM GUI, if the "Advanced" Configuration view is selected, the Health Monitors assigned to the pool member can be viewed. If the "Inherit from Pool" option is configured, the Health Monitors assigned to the pool can be viewed under the Properties tab for the pool.
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