7200 mtu issues

hi guys I’m trying to set the mtu on an etherchannel to 2000, the router allows this change in cli but on reboot the mtu is reset to 1500, following this message:

 

 

mtu 2000

       ^

Invalid input detected at ‘^’ marker.

 

 

 

the problem is this setting is overring the giga ports to 1500 and i need the mtu higher to accomidate mpls

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