Last Modified: Feb 19, 2020
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Known Affected Versions:
12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0, 12.0.0, 11.6.5, 11.6.3, 11.6.2, 11.6.1, 11.6.0, 11.5.9, 11.5.8, 11.5.7, 11.5.6, 11.5.5, 11.5.4, 11.5.3, 11.5.2, 11.5.1, 11.5.0, 11.4.1
Opened: Sep 23, 2014
Related AskF5 Article: K40120584
Move address from one high availability (HA) redundant LTM to another might cause BIG-IP monitor failure.
Only one of the redundant LTM systems get probed. If the probed LTM is standby, it ignores the probe request. The available BIG-IP redundant LTM server is marked down, the monitor does not work, and all hosted virtual servers are marked down.
-- LTM server high availability (HA) configuration with one address at 'Address List' and another at 'Peer Address List'. -- One of the addresses is moved from another.
To work around this: 1. In the GUI, delete the address from either the 'Address List' or 'Peer Address List' and click 'Update'. . 2. Add the address to the other field and click 'Update'. Note: Make sure to click 'Update' after step 1 before proceeding to step 2.