Maipu 3840 MTU Details

Hi, Today one of my client raised a query about MP 3840 MTU details about all 4 Gig interface. 
As MP 3840 is aggregation router, some time we need to modify the MTU of interface as per requirement. 
So I would like share same details here, Which can be helpful for all. 
MP 3840 Gig 0, you can configure max MTU of 1800 under Gig 0  interface for any peer device.
But Gig 1/2/3 , if speed is configured as 100 M or negotiating with 100M peer device. Then it will support max MTU 1500. If negotiating with 1000M or configured as 1000M , then it can support max 1800 MTU.


Hope this information will help in some critical scenario. 


Thanks for reading...