MTU defines the maximum size in bytes that a single unit of data that can be sent over a given link
If a packet cannot be sent over a given link ie if the size of the packet is more then the MTU which is defined then the packet is fragmented and the fragmented packets are reassembled at the other end.
Physical MTU:- This defines how large packets can be sent over the physical wire.
Service MTU:- This defines the service payload capabilities of the service ie how big packets that can be sent over the service.
SDP path MTU:- How large packets that can be sent over the sdp path.
IP-MTU command is used to configure the mtu of the vprn interface facing the CE router.
SDP MTU= Network port MTU-4 (mpls label)-4 (VC label)-14 null encapsulation/18 dot1q encapsulation
9212-(4+4+14)=9190
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