Last Modified: Oct 06, 2020
See more info
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, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2
13.0.0, 12.1.2, 11.6.1
Opened: Jul 21, 2015
Related AskF5 Article: K24803431
When using dynamic routing, it's possible that L4 connections fail to remirror after a restart on the standby device. Initial mirroring works as expected, but remirroring might not work.
Dynamically discovered routes might fail to remirror connections. One-way failover, similar to L7 virtual servers. Initial failover works as expected; subsequent failovers might drop connections.
Using dynamic routes and mirroring, and either the active or standby restarts. If the active restarts, failover completes correctly, but connections might not remirror to the previously active device after it comes back online.
Provide a static route instead of dynamic routes.
Remirroring L4 connections using dynamic routes works correctly. (Note that when using dynamic routes it is not guaranteed that the active and standby systems will use the same routes; if the same routing is required on both active and standby fails over, there might be some dropped connections.)