======L2 MTU======
=====General=====
  * MTU, or Maximum Transmission Unit, is the largest possible Ethernet frame a device can forward

=====IEEE 802.3 standard=====
    * Min Ethernet frame size = 64 bytes (B).
    * Max Ethernet frame size = 1518 B.
      * Updated to 1522 B for VLAN tagging.
    * Jumbo frames
      * Payload greater than 1500 B.
      * For use on local networks.
      * Can be as large as 9000 B.
      * Ports have to be at least 1 Gb/s.
    * Baby Jumbo frames
      * Slightly larger than 1500 B payload.
    * Super Jumbo frames
      * Payload greater than 9000 B.

=====MTU Configuration=====
  * Configure on a Cisco WS-3750X-48P.
    * <code>core-switch(config)#system mtu ?
  <1500-1998>  MTU size in bytes
  jumbo        Set Jumbo MTU value for GigabitEthernet or TenGigabitEthernet interfaces
  routing      Set the Routing MTU for the system</code>
  * Configure on a Cisco 9300-24UX.
    * <code>sw-27(config)#system mtu ?
  <1500-9198>  MTU size in bytes</code>

======Backlinks======
[[cisco:certification_topics:ccie-ei|CCIE-EI v1.1]]\\