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When configuring MTU on a tunnel, consider the following:

• At least one mpls label will be present when passing through the tunnel. Accounting should include all labels in the stack, for example, explicit null or entropy label; 
• vlan and q-in-q headers must be taken into account (if they present);
• If MTU of the outgoing interface is exceeded, the packet will be dropped (if GRE traffic match fragment is disabled);
• Control world is not supported;
• DF bit will be set to 1.

Approximate packet structure is given in figure below:

hostname CE1

interface gigabitethernet 1/0/2
  ip firewall disable
  ip address 10.100.0.1/24
exit