Bug ID 534457: Dynamically discovered routes might fail to remirror connections.

Last Modified: Apr 10, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

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

Fixed In:
13.0.0, 12.1.2, 11.6.1

Opened: Jul 21, 2015
Severity: 3-Major
Related AskF5 Article:
K24803431

Symptoms

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.

Impact

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.

Conditions

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.

Workaround

Provide a static route instead of dynamic routes.

Fix Information

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.)

Behavior Change