Information About the MTU
The default maximum transmission unit (MTU) size for payload received in Ethernet frame and sent on all device interfaces is 1500 bytes. The maximum value of System MTU is 9198 bytes. The maximum value of System MTU for Catalyst is 9216 bytes.
System MTU Value Application
This table shows how the MTU values are applied.
Configuration |
system mtu command |
ip mtu command |
ipv6 mtu command |
||||
---|---|---|---|---|---|---|---|
Standalone switch or switch stack |
You can enter the system mtu command on a switch or switch stack. It affects all ports. The range is from 1500 to 9198 bytes. The range is from 1500 to 9216 bytes. |
Use the ip mtu bytes command. The range is from 832 up to 1500 bytes.
|
Use the ipv6 mtu bytes command. The range is from 1280 to the system jumbo MTU value (in bytes).
|
The upper limit of the IP or IPv6 MTU value is based on the switch or switch stack configuration and refers to the currently applied system MTU value. For more information about setting the MTU sizes, see the system mtu global configuration command in the command reference for this release.
Beginning from Cisco IOS XE Amsterdam 17.3.x, the minimum IPv6 system MTU is fixed at 1280 as per RFC 8200.