Problem with Intel 82599 NICs and VLAN stripping

Solution Unverified - Updated -

Issue

  • One or more virtual machines are using SR-IOV Virtual Functions of an 82599 NIC via PCI passthrough
  • In the host,VLANs have been associated with the VFs using ip link or libvirt configuration: e.g.
ip link set ethXX vf 4 vlan NNN
  • Sometimes, guest interfaces still receive packets with VLAN tags attached
    • Since no VLANs are configured on the guest side, they don't receieve packets intended for them

Environment

  • Intel 82599 NIC (ixgbe driver), with SR-IOV support
  • Red Hat Enterprise Linux (RHEL) KVM host, any version
  • Non-RHEL KVM guests

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