If you set the MTU parameter on an ethernet port and the VLAN created from the ethernet interface, and then restart Oracle VM Server, the MTU parameter resets to the default value of 1500.

This issue occurs if the value of the ONBOOT parameter in the ifcfg-interface_name configuration file for the ethernet interface is contained within double quotation marks, for example, "no". When Oracle VM Manager creates the ifcfg-interface_name configuration file for the VLAN, the value of the ONBOOT parameter is yes. When the server reboots, the ONBOOT parameter for the ethernet interface does not change, and a discrepancy exists between the two ifcfg-interface_name configuration files. As a result, the MTU parameter resets to the default value of 1500.

Workaround: Ensure that the value of the ONBOOT parameter in the ifcfg-interface_name configuration file for the ethernet interface is not contained within double quotation marks, for example, ONBOOT=no.

Bug 22697133