The Adtran community holiday season is starting next week! The holiday period will span from December 21, 2024 to January 6, 2025. During this time, responses to feedback form submissions may be delayed. If you are encountering product issues, you can reach out to Adtran support at any time.
I was advised by Adtran that all of their products including the 5660 with only do 1500 MTU on layer 3 / IP. Any Jumbo Frame support is restricted to switching / L2 only.