Configuring the ATM service type

ATM supports the following service types: CBR, UBR, VBR-RT, and VBR-NRT. You can configure service types for PVCs, and configure different transmission priorities for PVCs associated with the UBR, VBR-NRT, and VBR-RT services. A greater value represents a higher priority. PVCs with higher priorities occupy more bandwidths. PVCs with the same priority occupy the same bandwidths. You cannot configure transmission priorities for CBR services.

To configure the ATM service type:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter ATM interface view or ATM subinterface view.	interface atm { interface-number \| interface-number.subnumber }	N/A
3. Enter PVC view or PVC view in PVC group.	Enter PVC view:pvc { pvc-name [ vpi/vci ] \| vpi/vci } Enter PVC view in a PVC group: pvc-group group-number pvc { pvc-name [ vpi/vci ] \| vpi/vci }	N/A
4. Configure the service type and related parameters for the PVC.	Set the service type to CBR and configure related parameters:service cbr output-pcr [ cdvt cdvt-value ] Set the service type to UBR and configure related parameters:service ubr output-pcr Set the service type to VBR-NRT and configure related parameters:service vbr-nrt output-pcr output-scr output-mbs Set the service type to VBR-RT and configure related parameters:service vbr-rt output-pcr output-scr output-mbs	The default service type is UBR. The newly configured service type overwrites the existing ones. Different PVCs in a PVC group or interface can be configured with different service types.
5. Configure the transmission priority for the PVC.	transmit-priority priority	By default, the transmission priority is: 0 for UBR services. 5 for VBR-NRT services. 8 for VBR-RT services. When you change the service type for the PVC, the transmission priority of the PVC is restored to the default.

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