Ethernet Frame Counts and Statistics on MX Series Routers
The following considerations apply to Ethernet frame counts and statistics on Juniper Networks MX Series 5G Universal Routing Platforms:
Interface counters do not include the 7-byte Ethernet frame preamble and the frame delimiter byte.
In Media Access Control (MAC) statistics. the frame size includes the MAC header and cyclical redundancy check (CRC) before any VLAN rewrite or other rules are applied.
In traffic statistics, the frame size includes the Layer 2 header without the trailer CRC and after any VLAN rewrite or other rules are applied.