Bug ID 868209: Transparent vlan-group with standard virtual-server does L2 forwarding instead of pool selection

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP None(all modules)

Known Affected Versions:,,,,,,,, 14.1.3,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2

Fixed In:
16.1.0,, 14.1.4

Opened: Jan 10, 2020

Severity: 3-Major


When BIG-IP is configured with transparent vlan-group and traffic is matching a standard or fastl4 virtual-server and traffic hitting BIG-IP does not have a destination MAC address that belongs to BIG-IP - traffic will be L2 forwarded and pool member selection will not happen. This defect will also cause active FTP data connections over vlan-group to fail.


Server-side connections will fail.


All conditions must be met: - Traffic over transparent vlan-group. - Standard or fastl4 virtual-server. - Traffic has a destination MAC address that does not belong to BIG-IP. OR - Standard virtual server with FTP profile is configured. - Active FTP session is in use. - Traffic flows over vlan-group.


Use opaque vlan-group instead. OR disable db variable connection.vgl2transparent (15.0+)

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips