http://blog.crhan.com/2014/05/mtu-and-mss/
cisco (Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC)
| 802.3ac | 1998 year | Max frame size extended to 1522 bytes (to allow "Q-tag") The Q-tag includes 802.1Q VLAN information and 802.1p priority information. |
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