The default maximum transmission unit (MTU) size for payload received in Ethernet frame and sent on all device interfaces is 1500 bytes. This table shows how the MTU values are applied. You can enter the system mtu command on a switch or switch stack. MTU Size: What It Is, Why It Matters, and When to Use Jumbo Frames. StarWind Customer Engineering Manager. Michael brings 20+ years of experience in IT infrastructure design and virtualization. With deep knowledge of storage systems and systems administration, he provides technical leadership in. Configure the media MTU for a physical interface and the MTU for a protocol to optimize traffic over your network. If a packet exceeds the MTU of an interface, the system must either fragment the packet into smaller pieces before transmission. With Gigabit and 10 Gigabit Ethernet, if all of the machines on the network have Gigabit Ethernet adapters and no 10/100 adapters on the network, then it would be best to use jumbo frame mode. For bandwidth-intensive apps like video streaming, gaming, or VoIP, consider upping the MTU for.