Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
If the receiving (ingress) port was "standard" Ethernet, the received frame would be dropped, as being oversized.
If the receiving (ingress) port was "jumbo" capable Ethernet, jumbos were enabled, and if its jumbos supported 1700 bytes (there's no jumbo size standard), then the frame would be accepted on the port. What happens next would depend whether the received frame needed to be forwarded (it might be directed to the router itself), and if so, how the egress port was configured. It might be dropped by an egress port on that router, forwarded as same size, or L3 fragmented into multiple L2 frames.
BTW, fragmentation is at L3, i.e. packets are fragmented, Ethernet frames are L2 and are never fragmented. Even from the source host, with standard Ethernet end-to-end, packets will be fragmented if they are larger than the frame can contain. Normally, source host will size its packets to fit into the host's frames without the need to fragment.
