The command "mpls mtu " is used to set the MPLS MTU value higher than the interface MTU value .
But I also see the note " Although you can set the MPLS MTU to a value greater than the interface MTU, set the MPLS MTU less than or equal to the interface MTU to prevent data corruption, dropped packets, and high CPU conditions".
Then , whether I set the mpls mtu > ip mtu or set the mpls mtu < ip mtu?
Now , I meet the device is cisco WS-C6509 with IOS 12.2(18)SXD7b , the interface is a Gigaethernet with the default interface mtu=1500 and mpls mtu=1532, when this port receive a packet labled = 1504 ,the device will drop this ? or fragement it?
Actually on fast ethernet interfaces one cannot configure more than mtu 1500 but when the labeled packet will come it is going to minus the value from the total size menas 4 bytes will be minuesed. Now the packet size is 1496 + 4 bytes=1500 bytes. But on the giga interfaces they support more than 1500 or we can jumbo frames. No fragmentation will be done in that case but it should be clear that the whole LSP path should able to hadle more than 1500 bytes packets; if on the path anyinterface which is hvaing fast ethernet and cannot support more than 1500; thee packet will be dropped there or fragment the packet to deliver it properly.
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