As most of us who worked with vSphere 4 would probably know, changing the MTU size of a vSwitch had to be done via command line with the:
esxcfg-vswitch –m #### vSwitch#
… which looked something like this:
login as: root
Using keyboard-interactive authentication.
Password:
The time and date of this login have been sent to the system logs.
VMware offers supported, powerful system administration tools. Please
see www.vmware.com/go/sysadmintools for details.
The ESXi Shell can be disabled by an administrative user. See the
vSphere Security documentation for more information.
~ # esxcfg-vswitch -l
Switch Name Num Ports Used Ports Configured Ports MTU Uplinks
vSwitch0 128 4 128 1500 vmnic2,vmnic3
PortGroup Name VLAN ID Used Ports Uplinks
VM Network 0 0 vmnic2,vmnic3
Management Network 1116 1 vmnic2,vmnic3
~ # esxcfg-vswitch -m 9000 vSwitch0
~ #
~ #
~ #
~ # esxcfg-vswitch -l
Switch Name Num Ports Used Ports Configured Ports MTU Uplinks
vSwitch0 128 4 128 9000 vmnic2,vmnic3
PortGroup Name VLAN ID Used Ports Uplinks
VM Network 0 0 vmnic2,vmnic3
Management Network 1116 1 vmnic2,vmnic3
~ #
What’s nice about vSphere 5.0 is that you can now configure the MTU size in the GUI. See the following screenshots with vSphere 4.x on the left and 5.0 on the right:
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