VN-Tag packets
The frame decoder recognizes an outer VN-Tag-encapsulated packet if the EtherType field is 0x8926.
Note: VN-Tags are only recognized if they appear right after the layer 2 source
MAC address.
Note: VN-Tag classification does not apply to NT40E3-4-PTP running on the capture/replay
image nor NT40A01 running on the 4 × 10/1 Gbit/s SLB image.