Bug ID 653453: ARP replies reach front panel port of the B4450 blade, but fail to reach TMMs.

Last Modified: Apr 28, 2025

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:
13.1.0, 12.1.2 HF1

Opened: Mar 24, 2017

Severity: 2-Critical

Related Article: K35241150

Symptoms

ARP replies reach the front panel port of the B4450 blade, but fail to reach TMMs. This is caused by a L2 issue in the Broadcom Trident2+ switch B4450 blade uses.

Impact

The traffic hitting the corrupted L2 FDB entry will be dropped by the switch.

Conditions

The switch learned a corrupted L2 FDB entry on an internal HiGig trunk.

Workaround

Identify the affected VLAN and flush L2 FDB entries on that VLAN using the following command: tmsh delete net fdb vlan {vlan_name}.

Fix Information

Resolved an issue on Broadcom Trident2+ switch B4450 blades use in which ARP replies reached the front panel port, but failed to reach TMMs.

Behavior Change

A new BigDB variable is added to control in which mode the l2xmsg module in Broadcom SDK should run. bcm56xxd.l2xmsg.mode: poll/fifo (default) The BIG-IP system used to always run l2xmsg module in poll mode. Now, the BIG-IP system runs l2xmsg mode in fifo by default.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips