title: header of jumbo ethernet frame and of super jumbo frame
body: <p>There is possible to use very big frames with some ethernet cards. One case is 9k frames or jumbo frame and other case is super jumbo frame (as i know, up to 64k).</p>
  
  <p>What is format of frame used for such huge packets?</p>
  
  <p>As I know, for normal frames two formats used widely:</p>
  
  <pre><code>Preamble    Start_byte  dest_mac    src_mac     Ethertype/length    Payload     CRC     Interframe gap
  10101010x7  10101011    6 bytes     6 bytes     2 bytes         46–1500 bytes   4 bytes 12 bytes
  </code></pre>
  
  <p>In one case, the ethertype is used for length, and in second - for packet type. If this field is &lt; 0x0600 (decimal 1536 bytes), this is a length; if >= 0x0600 - it is a type.</p>
  
  <p>So, it looks impossible to store 9000 in this field as length. How length of jumbo and super jumbo frames is stored? </p>