Bug ID 2217093: L2 traffic to masquarade MAC on Standby might be flooded when multiple interfaces are used

Last Modified: Feb 03, 2026

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

Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 21.0.0, 21.0.0.1

Opened: Jan 27, 2026

Severity: 3-Major

Symptoms

On platforms without the switch (i2000/i4000) configured with multiple interfaces under a single VLAN, traffic to masquarade MAC address will be flooded to all available interfaces and will not follow FDB entries.

Impact

Unnecessary flooding occurs.

Conditions

- Switchless platform (like i2000/i4000). - Multiple interfaces configured under a single VLAN. For example: net vlan vlan2 { interfaces { 2.0 { tagged } trunk1 { tagged } } } - traffic to masquarade MAC is misdirected to Standby unit.

Workaround

None.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips