Fnic CPU0: 2: start the discovery of VLAN - fnic cpu0: 2: request send VLAN...

our vmkernel.log is FLOODED with error messages like this:

(2014 09-17 T 15: 08:11.763Z cpu0:33523) < 7 > fnic: 2: start the discovery of VLAN

(2014 09-17 T 15: 08:11.764Z cpu20:33539) < 6 > fnic: 2: request send VLAN...

(2014 09-17 T 15: 08:13.038Z cpu0:33523) fnic < 7 >: 3: start the discovery of VLAN

(2014 09-17 T 15: 08:13.038Z cpu0:33549) fnic < 6 >: 3: request send VLAN...

as you can see this message pops up all the second and sometimes several times per second. our network guys don't see no discovery VLAN.

This happens on a triple cluster of Cisco C240M3S with the last ESX5.5U2 running a VSAN for Horizon 6 environment. seems not to impact performance or features, but due to the frequency it makes it very hard to debug, other issues because he literally swamps the vmkernel newspaper.

someone has an idea of what is causing this?

It's because of the DCBX. You have cadrs ANC and ESXi are looking for FCoE VLAN. If you do not FCoE, you can disable the driver FCoE on ESXi hosts. The UCS is probably fnic module:

esxcfg-module d fnic

This should add a line to /etc/vmware/esx.conf

# cat /etc/vmware/esx.conf | grep fnic

/ VMkernel/module/FNIC/Enabled = "false".

You need to restart the ESXi host

Tags: VMware

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