invalid interface

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invalid interface

L3 Networker

hello have getting a lot of 802.1q tag not configured and invalid interface message in global counters. I'm trying to find the cause, I have configured subinterfaces I see traffic in rx.pcap with properly tag, all traffic is dropped, I see as destination mac addres of the fisical interface when I have configured subinterfaces, could someone help me with this issue please?



Cyber Elite
Cyber Elite

these errors mean the firewall is receiving packets with a 802.1q tag it has no subinterface for

if you finetune your switch trunk to only include the vlan tags that are configured on the firewall, these messages will stop


I think the incorrectly tagged packets are discarded before they arrive at the RX stage, because there is no interface to rx them



here are a couple articles that may help (since i'm not sure if you have layer 2 or 3)

Tom Piens
PANgurus - SASE and Strata specialist; (co)managed services, VAR and consultancy


Reaper, thank you very much for your answer, I would like to understand this. I thougth that all packet that arrive to the fw were in RX stage, then when we get errors as invalid interace and 802.1q tag not configured this packets don't appears in rx stage, this is correct?

there is other counters that show you error in packets that don't arrive at RX stage?


I reviewed the configuration done, is an L3 interface and I don't find nothing weird.

as I explain before I see traffic tagged correctly in RX stage, but all this traffic is dropped, If this traffic is droped in a policy, this traffic must appear in fw stage, this is correct?

I don't know how to find the cause this traffic is dropped....

oh, your original statement seemed to state you were not seeing any of the discarded tagged packets, please disregard my previous statement and provide screenshots so I can ascertain what is actually going on 🙂


how is your L3 interface and, more importantly, the tagged subinterfaces configured and which .1q tags are showing up in the discarded packets



Tom Piens
PANgurus - SASE and Strata specialist; (co)managed services, VAR and consultancy


hello reaper thank you again for your help of course I will show you information I got:

here you can see the tag I see in rx.pcap


and you can see subinterface configured has the correct tag




is the interface showing in > show interface all as well ? are you sure you are receiving the packet on that physical interface ?

Tom Piens
PANgurus - SASE and Strata specialist; (co)managed services, VAR and consultancy

hello, yes in >show interface all I see the subinterface

show interface.JPG

I have traffic logs showing inbound interface eth1/7.1701 and outbound interface the same. but this traffic is not the same that I have been analising in pcac because was generated in other moment.

But if I have traffic logs I should have fw.pacap, this is correct?

yes, if there are traffic logs there should be fw stage logs unless the traffic is offloaded (offloaded packets cannot be captured)

Tom Piens
PANgurus - SASE and Strata specialist; (co)managed services, VAR and consultancy
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