Ifstat NOPROTO counter increasing on all VLAN ports

[pedro_rocha]

Hello,

We are running ONTAP 9.8P10.

All VLAN ports are showing an increasing number of the noproto counter in the ifstat output.

I have already checker this: https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/Troubleshooting_Ethernet_Network_Ports_in_ONTAP_using_ifstat

It says:

- Noproto

  - If a port receives a packet tagged with a VLAN ID that does not exist, the packet will be dropped and this counter will be incremented.

"Does not exist" meaning that the VLAN does not show up under "vlan show -port <affected_port>"

Networking side checked and all the VLANs on the switch ports are created on the NetApp side.

Any ideas?

We'll get some packet traces to check also.

Thanks,

Pedro

[hmoubara]

Hello,

Are the vlan port an ifgrp vlan tagged or just a single port vlan tagged?

Are you seeing the noproto on the vlan tag port only or also at the ifgrp/port level as well?

A trace would help as we can determine if the packet are being tagged with the vlan ID or not.

Thanks 

[pedro_rocha]

Hi!

It is a ifgrp vlan port (there are several vlan ports on top of this ifgrp)

We see the noproto counter incrementing only on the ifgrp vlan ports

The trace showed only multicast packets from the other cluster nodes on the same networks...

Regards,

Pedro

[tahmad]

Did you check this KB, it might be related to your issue:

https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/ONTAP_9_LIF_configured_for_a_VLAN_is_unreachable_when_native_VLAN_is_p... 

[Mjizzini · Accepted solution]

'noproto' counter is incremented when the filer receives a packet on an invalid VLAN

The best is to ask for the "show vlan brief " output from the networking team. You can compare them to the VLAN list on the port.