Traffic Shaping Rates; Configuration; Table 21-4 Traffic Shaping Rates; Figure 21-4 Traffic Shaping Example - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

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
enabled
No traffic
shaping

Traffic Shaping Rates

Traffic shaping rates are listed in Table 21-4.

Table 21-4 Traffic Shaping Rates

Service Type
CBR
rt-VBR and nrt-VBR
UBR
ABR

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, and cnftrk commands:
Cisco BPX 8600 Series Installation and Configuration
21-14
CBR Qbin
Port 1
VBR Qbin
ABR/UBR Qbin
ABR/UBR Qbin
Port 2 VBR Qbin
CBR Qbin
MCR
PCR
SCR * %Util
0
MCR * %Util
VC queues
CBR
VBR
UBR
ABR
ABR
ABR (with FCES)
UBR
VBR
CBR
PCR
PCR
PCR
PCR
PCR
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21 Configuring ATM Connections