Changing the IPv4 MTU on an Interface

You can change the size of the IPv4 maximum transmission unit (MTU) on each Layer 3 interface. IP MTU configuration is not supported on a port-channel.

About this task

By default, IPv4 MTU is 1500 bytes. Valid values range from 1300 through 9194 bytes.

Note

If the interface is part of a VE, change the IPv4 MTU only at the VE interface and not at the physical port. Switchports have only the MTU value configured. They do not inherit from the IP MTU of the VE. Extreme recommends that you configure both MTU and IP MTU to be the same value.

1. Access global configuration mode.
   

   device# configure terminal
   

2. To change the IPv4 MTU on an Ethernet interface, take the following steps.
   1. Access the interface on which you want to modify the IPv4 MTU.
      

      device(config)# interface ethernet 1/5
      

   2. Specify the IPv4 MTU value.
      

      device(config-if-eth-1/5)# ip mtu 2000
      

3. To change the IPv4 MTU at a VE interface, take the following steps.
   1. Access the VE on which you want to modify the IPv4 MTU.
      

      device(config)# interface ve 103

   2. Specify the IPv4 MTU value.
      

      device(config-ve-103)# ip mtu 2000