Bug ID 677525: Translucent VLAN group may use unexpected source MAC address

Last Modified: Nov 22, 2021

Bug Tracker

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

Known Affected Versions:
13.1.0, 13.0.0, 12.1.3, 12.1.2, 12.1.1, 12.1.0, 12.0.0,, 11.6.3, 11.6.2, 11.6.1, 11.6.0, 11.5.5, 11.5.4

Fixed In:
14.0.0,,,, 11.5.6

Opened: Aug 08, 2017
Severity: 3-Major
Related AskF5 Article:


When a VLAN group is configured in translucent mode, IPv6 neighbor discovery packets sent from the BIG-IP system may have the locally unique bit flipped in the source MAC address.


In an HA configuration, switches in the network may have FDB entries for the standby system assigned to the port of the active system.


VLAN group in translucent mode.


No workaround at this time.

Fix Information

Translucent VLAN group no longer send neighbor discovery packets whose source MAC has the locally unique bit flipped.

Behavior Change