--- Comment #1 from ---
A commit references this bug:

Author: hselasky
Date: Mon Dec  7 18:55:33 UTC 2015
New revision: 291953

  When setting up VLANs on a Raspberry Pi ethernet port, the MTU drops
  from 1500 to 1496 bytes. The MTU should remain at 1500, extending the
  frame size as per IEEE 802.3. Adding IFCAP_VLAN_MTU to the
  if_capabilities field in the smsc driver solves the problem.  The
  datasheet for the LAN9512 chip, section 3.2.3 states that the chip
  supports the extended frame.

  Submitted by:
  MFC after:    1 week
  PR:        205050


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