Subinterface Not Showing Traffic

We have multiple 802.1Q subinterface on Cisco Switches.  The primary interface is showing the traffic but the subinterfaces don't show the traffic.

  • I think that's fairly common, even if you do a "show interface" and look at the subinterfaces they don't give you traffic, so I don't think it reports that via SNMP either.    If you're doing L3 on the interfaces, you might be able to get something via Netflow?   Not sure on that though...

  • Have you checked the boxes for Interface statistics for each of the sub-interfaces?

    I don't have a Cisco handy in my home lab, but here's a screenshot of a device with subinterfaces:

    These aren't always checked by default, so you may want to investigate.