vm/vmknic traffic disconnects on software vlan untagging mode with Broadcom BCM5741x NIC

Products

• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• vm/vmknic traffic disconnects on software vlan untagging mode.

• The issue happens only with Broadcom BCM5741x NIC.

Cause

There is an issue with the firmware programming of the CFA table entries when an interface is put in promiscuous mode. This is causing the tagged ucast traffic to get dropped.

Resolution

Currently there is no resolution to the issue. This will be fixed in a future release of the Broadcom NIC FW.

Workaround:

To workaround the issue, please change software tagging as OFF, then again set it to ON.
esxcli network nic software set --untagging=0 -n vmnicN
esxcli network nic software set --untagging=1 -n vmnicN

Additional Information

Product versions:

Broadcom BCM5741x NIC FW 228.x or earlier.