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6-2 SmartSwitch ATM User Guide
Traffic Management Capabilities Traffic Management
ATM SmartSwitch user data cells are classified according to the state of a cell loss priority (CLP) bit in the header of
each cell. A CLP 1 cell has a lower priority than a CLP 0 cell and is discarded first. Source traffic descriptors can
specify CLP 0 cell traffic, CLP 1 cell traffic, or the aggregate CLP 0+1 traffic.
Use the
trafficdescriptor commands to view, create, and delete traffic descriptors.
For example, enter the
show trafficdescriptor command to view all currently defined traffic descriptors.
SmartSwitch # show trafficdescriptor
========================================================================================
TD# Traff Desc QoS Peak Cell Rate Sust Cell Rate Max Burst Size Min Cell Aal Type
Type Type (Kb/s) (Kb/s) (Kb/s) Rate
CLP_0 CLP_0+1 CLP_0 CLP_0+1 CLP_0 CLP_0+1 (Kb/s)
=========================================================================================
1 NRTVBR 7 0 0 10872 5436 0 2052 0 0 5
2 CBR 2 1 0 100 0 0 0 0 0 5
176 NRTVBR 2 1 0 1585 0 0 0 0 0 5
SmartSwitch #
Note You cannot use the default traffic descriptors for user-defined PVCs. All traffic
descriptors used to define PVCs must be created by the user.
The Descriptor Type parameter in the example above corresponds to the traffic descriptor types defined in the
UNI3.0/UNI3.1 specification. Descriptor types are specified numerically and correspond to the descriptions in
Table 6-1.
Table 6-1 Traffic descriptor type number explanation
Type Valid Service
Category
Descriptor Characteristics
1 No Traffic Descriptor
2 CBR PeakCellRate CLP0+1
3 CBR PeakCellRate CLP0+1, PeakCellRate CLP0
4 CBR PeakCellRate CLP0+1, PeakCellRate CLP0, Tag CLP = 1
5 VBR PeakCellRate CLP0+1, SustCellRate CLP0+1, MaxBurstSize CLP0+1
6 VBR PeakCellRate CLP0+1, SustCellRate CLP0, MaxBurstSize CLP0
7 VBR PeakCellRate CLP0+1, SustCellRate CLP0, MaxBurstSize CLP0, Tag CLP = 1
8 ABR PeakCellRate CLP0+1, Minimum Cell Rate
11 UBR BestEffort