16ViewATM interface viewDefault level2: System levelParametersmtu-number: MTU size in bytes on the current ATM interface, in the range of 128 to 2000.DescriptionUse the mtu command to set the size of maximum transmission unit (MTU) on the current ATM interface.Use the undo mtu command to restore the default.By default, the MTU of an ATM interface is 1500 bytes.NOTE:You can configure this command in either ATM main interface view or ATM subinterface view. Thecommand takes effect only on the configured interface or subinterface.Examples# Set the MTU to 1492 bytes for interface ATM 3/1/1. system-view[Sysname] interface Atm 3/1/1[Sysname-Atm3/1/1] mtu 1492oam cc end-to-endSyntaxoam cc end-to-end { both | sink | source }undo oam cc end-to-end { both | sink | source }ViewPVC viewDefault level2: System levelParametersboth: Enables the PVC as both the continuity check (CC) cell source and the CC cell sink, that is, thereceiver.sink: Enables the PVC as the CC cell sink to receive and process CC cells.source: Enables the PVC as the CC cell source to generate CC cells.DescriptionUse the oam cc end-to-end command to enable the OAM continuity check (CC) function on the currentPVC.Use the undo oam cc end-to-end command to disable the OAM CC function on the current PVC.By default, OAM CC is disabled.