Bug ID 901569: Loopback traffic might get dropped when VLAN filter is enabled for a virtual server.

Last Modified: Jul 23, 2024

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,,, 16.0.0,, 16.0.1,,, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,,,,, 17.1.1,,,

Opened: Apr 21, 2020

Severity: 3-Major


Loopback traffic (local traffic) destined to a virtual server might get dropped when the incoming packet matches a terminating connection flow.


Traffic that is matched against a terminating connection flow of a virtual is not processed by the virtual server.


-- VLAN filter is enabled on the virtual server created for loopback traffic processing. -- An incoming packet matches a terminating connection flow (i.e., the connection flow terminates because of timeout, being dropped by iRule, etc.).


Because this filter is ignored for loopback traffic, removing the 'Enabled On VLAN' filter at the virtual server mitigates the issue.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips