Bug ID 686029: A VLAN delete can result in unrelated VLAN FDB entries being flushed on shared VLAN member interfaces

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,

Fixed In:

Opened: Sep 28, 2017
Severity: 3-Major
Related AskF5 Article:


FDB flushing on VLAN deletes is performed by VLAN member interface reference only, without regard to VLAN tags. This can result in unrelated VLAN FDB entries also being flushed on shared VLAN member interfaces.


FDB entries for unrelated VLANs will be flushed if they share the same tagged VLAN member interfaces as the VLAN being deleted.


Issuing a VLAN delete with other VLANs using shared tagged member interfaces with the VLAN being deleted.



Fix Information

Correct FDB flushing on VLAN deletes, by limiting the scope to be VLAN specific.

Behavior Change