Hi Durga,
Thank you for the post. The X540-AT2 is an ethernet controller and supports jumbo frames,
you may refer to the product brief for reference:
http://www.intel.com/content/www/us/en/embedded/products/networking/ethernet-x540-brief.html
For support and driver you can visit this website for more information:
Support and Driver Downloads for the Intel® Ethernet Controller...
Thanks,
wb