Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers
How to Configure AToM VCs on the 4-Port ATM ISE Line Card
63
Cisco IOS Release 12.0(27)S
See the
“Troubleshooting ATM Errors on the 4-Port ATM ISE Line Card” section on page 76
for more
information on the output from these commands.
Configuring Cell-Based Traffic Policing on AToM VCs
Traffic policing is configured using the Modular QoS CLI. In order to configure traffic policing, you
need to do the following:
•
Define a traffic class to classify the traffic (See the
“Defining a Traffic Class” section on page 84
for
more detailed information.)
•
Create a traffic policy with QoS features that determine how to treat classified traffic
•
Attach the traffic policy to a PVC
For Layer 2 traffic, you can configure traffic policies that will guarantee a particular quality of service
(QoS) traffic class. This is done using the
police rate
command in policy-map class configuration mode.
The supported policing configurations are shown in
Table 7
.
If single-bucket policing is used, there is a single policy definition using the rate and burst tolerance
parameters. For a two-bucket policer, the rate and burst tolerance are taken from the parent policy, and
the SCR and ATM maximum burst size (MBS) values are taken from the child policy.
This section describes some of the most common tasks that are necessary to configure QoS traffic
policing on AToM VCs. For more detailed information regarding MQC, see the
“Configuring Modular
QoS CLI” section on page 84
.
•
Configuring CBR or UBR.1 Policing, page 64
•
Configuring VBR.1 Policing, page 65
•
Configuring VBR.2 Policing, page 67
•
Configuring VBR.3 Policing, page 69
•
Attaching a Service Policy to a PVC, page 72
•
Troubleshooting Tips, page 73
Restrictions
The following restrictions apply to policing on the 4-port ATM ISE line card:
•
The service-policy command must be used in l2transport mode. The EXP bit setting applies
uniformly for CLP0 and CLP1 cells.
Table 7
Supported Policing Configurations
Conformance Definition
GCRA
1
PCR Flow
1.
GCRA=Generic Cell Rate Algorithm
Action
GCRA SCR Flow
Action
CBR
CLP(0+1)
Discard
N/A
N/A
VBR.1
CLP(0+1)
Discard
CLP(0+1)
Discard
VBR.2
CLP(0+1)
Discard
CLP(0)
Discard
VBR.3
CLP(0+1)
Discard
CLP(0)
Tagging
UBR.1
CLP(0+1)
Discard
N/A
N/A
