SmartSwitch Router User Reference Manual 43Service Class DefinitionCreating a Service Class DefinitionTo create a service class definition, enter the following command in Configure mode:The following is a description of the parameters used to create a service class definition:service Specifies a name for the service class definition. The maximum length is32 characters.srv-cat Defines the service category for the service class definition:cbr Constant Bit Rate provides a guaranteed constant bandwidthspecified by the Peak Cell Rate (PCR). This service category requiresonly the PCR value. The Sustainable Cell Rate (SCR) and MaximumBurst Size (MBS) values are ignored. This service category is intendedfor applications that require constant cell rate guarantees such asuncompressed voice or video transmission.ubr Unspecified Bit Rate is strictly best effort and runs at the availablebandwidth. Users may limit the bandwidth by specifying a PCRvalue. The SCR and MBS are ignored. This service class is intendedfor applications that do not require specific traffic guarantees. UBR isthe default.rt-vbr Real-Time Variable Bit Rate provides a guaranteed constantbandwidth (specified by the SCR), but also provides for peakbandwidth requirements (specified by the PCR). This servicecategory requires the PCR, SCR, and MBS options and is intended forapplications that can accommodate bursty real-time traffic such ascompressed voice or video.nrt-vbr Non Real-Time Variable Bit Rate provides a guaranteed constantbandwidth (specified by the SCR), but also provides for peakbandwidth requirements (specified by the PCR). This servicecategory requires the PCR, SCR, and MBS options and is intended forapplications that can accommodate bursty traffic with no need forreal-time guarantees.pcr Specifies the Peak Cell Rate, which defines the maximum cell transmissionrate. The default is 176603 cells/sec. This parameter is valid for CBR, rtVBR,and nrtVBR service categories. This parameter is optional for UBR.pcr-kbits Specifies the Peak Cell Rate, which defines the maximum cell transmissionrate, expressed in kbits/sec. The default is 149759 kbits/sec (176603Creates a service class definition. atm define service [srv-cat cbr| ubr| rt-vbr| nrt-vbr] [pcr] [pcr-kbits] [scr] [scr-kbits][mbs] [encap routed-llc| routed-vcmux] [oamon| off]
