Why MTU value for VLAN interface is not inherited from parent interface on reboot when using NetworkManager ?

Solution Verified - Updated -

Issue

  • When I reboot the system, the MTU setting on my VLAN interfaces is not inherited from the parent interface.
  • MTU value for VLAN is not persistent across reboot in RHEL 7.

Environment

  • Red Hat Enterprise Linux 7.
  • NetworkManager.

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