Specifications

21-14
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21 Configuring ATM Connections
ATM Connection Flow
Figure 21-4 shows an example of traffic shaping. In this example, port 1 is configured to perform traffic
shaping.
Note that all the ATM cells regardless of class of service pass through the VC queues before leaving the
card when traffic shaping is enabled. In the example, port 2 is not configured for traffic shaping, and
only the ABR traffic with FCES (flow control external segment) passes through the VC queues.
Figure 21-4 Traffic Shaping Example
Traffic Shaping Rates
Traffic shaping rates are listed in Table 21-4.
Configuration
Traffic shaping is disabled by default.
Use the cnfport and cnfln command to enable and disable the function on a per port basis.
Use the cnftrk command to enable traffic shaping on trunks.
No connections should be enabled on the port prior to changing the port traffic shaping parameter. If
there are existing connections when the port is toggled, then these connections will not be updated
unless the card is reset, connections are rerouted, a switchcc occurs, or you modify the connection
parameters.
See the following examples of the cnfln, cnfport,andcnftrk commands:
Traffic
shaping
enabled
Port 1
No traffic
shaping
Port 2
ABR/UBR Qbin
VBR Qbin
CBR Qbin
ABR/UBR Qbin
VBR Qbin
CBR Qbin
12150
VC queues
CBR
CBR
VBR
VBR
UBR
UBR
ABR
ABR
ABR (with FCES)
Table 21-4 Traffic Shaping Rates
Service Type MCR PCR
CBR PCR PCR
rt-VBR and nrt-VBR SCR * %Util PCR
UBR 0 PCR
ABR MCR * %Util PCR