Bug ID 1002417: Switch L2 forwarding entries learnt on multi-blade trunk in one blade needs to be synchronized to other blades of that trunk

Last Modified: May 29, 2024

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

Known Affected Versions:,, 12.1.6,,,, 13.1.4,, 13.1.5,, 14.1.4,,,,,,, 14.1.5,,,,,,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,,,,

Opened: Mar 15, 2021

Severity: 3-Major


In a chassis, when the switch needs to forward a packet where the destination MAC address does not exist in the L2 forwarding table (DLF, destination lookup failure), the packet is forwarded to blade one and flooded there. This can lead to interfaces on blade one being more heavily used.


It may lead to an out of bandwidth condition on interfaces.


Altering of trunk vlan memberships after failovers will lead to traffic imbalance on egress ports.



Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips