topic Re: Ifstat NOPROTO counter increasing on all VLAN ports in ONTAP Discussions

Ifstat NOPROTO counter increasing on all VLAN ports

pedro_rocha — Wed, 04 Jun 2025 10:03:43 GMT

Hello,

We are running ONTAP 9.8P10.

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

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 — Wed, 09 Mar 2022 03:18:53 GMT

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 — Fri, 11 Mar 2022 19:29:34 GMT

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 — Wed, 16 Mar 2022 04:49:57 GMT

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

Mjizzini — Wed, 16 Mar 2022 05:30:05 GMT

'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.