Symptoms

Upgrading a device from 10.x fails unless both sides have a management IP configured in their config-sync settings before the upgrade.

Impact

Sync will not work between your two devices.

Conditions

You are trying to upgrade an HA pair from 10.x.

Workaround

Before upgrading, tell each device about the other's management IP.

Fix Information

Upgrading a device from 10.x formerly would fail unless both sides have a management IP configured in their config-sync settings before the upgrade. This is now no longer required, although it is still encouraged.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips