NetApp
Storage Controllers : Configuration > Ports/Adapters : Managing Ports/Adapters : Editing VLAN interface settings
Editing VLAN interface settings
You can modify the MTU size for a VLAN interface.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
Ensure the left navigation pane displays the storage controllers hierarchy.
3.
In the navigation pane, select the storage controller and click Configuration > Ports/Adapters.
4.
In the Ethernet Ports tab, select a VLAN from the list and click Edit.
5.
Modify the MTU size as required and click Edit.

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