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Traffic Management Overview
Table 21-1 Standard ATM Traffic Classes (continued)
Attribute
QoS Parameters
Pk-to-Pk CDV
Max CTD
CLR
Other Attributes
Congestion Control Feedback
The standard ATM traffic parameters are defined in Table 21-2.
Table 21-2 Traffic Parameters
Name
PCR
CDVT
MBS
MCR
The Quality of Service (QoS) parameters are defined in Table 21-3.
Table 21-3 Quality of Service Parameters
Name
CDV
Max CTD
CLR
For congestion control feedback, ABR provides a means to control flow based on congestion
measurement.
Cisco BPX 8600 Series Installation and Configuration
21-4
CBR
x
x
x
Description
Defines the Peak Cell Rate (PCR) in cells per second. The maximum rate at which
a connection can transmit.
Defines the Cell Delay Variation Tolerance (CDVT) in usec. The time scale is
established over which the PCR is policed. The time scale is set to allow for jitter
(CDV) that is introduced, for example, by upstream nodes.
Defines the Maximum Burst Size (MBS) in cells. The maximum number of cells
can burst at the PCR but still be compliant. This is used to determine the Burst
Tolerance (BT,) which controls the time scale over which the Sustained Cell Rate
(SCR) is policed.
Defines the Minimum Cell Rate (MCR) in cells per second. The minimum cell is
rated to contract delivery by the network.
Description
Specifies the Cell Delay Variation (CDV) that determines the measure for the cell
jitter introduced by network elements.
Specifies the Maximum Cell Transfer Delay (Max CTD) that determines the
maximum delay incurred by a cell, such as propagation and buffering delays.
Specifies the Cell Loss ratio (CLR) that determines the percentage of lost
transmitted cells.
Chapter 21
rt-VBR
nrt-VBR
x
x
x
x
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Configuring ATM Connections
UBR
ABR
nw specific
x
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