Bug ID 908021: Management and VLAN MAC addresses are identical

Last Modified: Sep 13, 2023

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

Known Affected Versions:
12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 16.0.0,, 16.0.1,,

Fixed In:
16.1.0, 15.1.3,,

Opened: May 11, 2020

Severity: 3-Major


The 'tmsh show sys mac-address' command indicates the management interface is using the same MAC address as a VLAN.


The management MAC address is the same as the VLAN MAC address, resulting in issues relating to the inability to differentiate traffic to the management port or to traffic ports.


This can occur on chassis based systems and on VCMP guests. The MAC address pool does not reserve specific MAC addresses for the management interfaces and so pool entries may be reused for VLANs.



Fix Information

The issue has been fixed for hardware platforms. That is, MAC addresses in the MAC address pool have been reserved for the management port. Due to the small MAC pool size for a few platforms (see K14513: MAC address assignment for interfaces, trunks, and VLANs :: https://support.f5.com/csp/article/K14513#vlans), entries cannot be reserved for VCMP guest management interfaces.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips