Cisco 10000 Series User Manual

17-50
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 17 Configuring Dynamic Subscriber Services
Queuing PPP Sessions on ATM VCs
Verification Examples for Per Session Shaping and Queuing on LNS Policies
Example 17-28 shows sample output for the show policy-map command. In the example, the router uses
20 overhead bytes in calculating ATM overhead.
Example 17-28 Sample Output—show policy-map Command
Router# show policy-map child
Policy Map child
Class Class1
Average Rate Traffic Shaping
cir 20% account user-defined 20
Example 17-29 shows sample output for the show running-config command. In the example, the output
modifier starts the display at the Parent policy map line.
Example 17-29 Sample Output—show running-config Command
Router# show running-config | begin Parent
Policy Map Parent
class class1
shape average percent 20 account user-defined 20 atm
policy-map child
class class2
shape average percent 20 account user-defined 20 atm
!
Queuing PPP Sessions on ATM VCs
PPP Session Queuing on ATM Virtual Circuits (VCs) enables you to shape and queue PPP over ATM
(PPPoA) and PPP over Ethernet over ATM (PPPoEoA) sessions to a user specified rate. Multiple
sessions can exist on any ATM VC and have QoS policies applied, or some of the sessions might have
QoS policies while others do not. The router shapes the sum of all PPPoA or PPPoEoA traffic on a VC
so that the subscriber’s connection to the DSLAM does not become congested. Queuing-related
functionality provides different levels of service to the various applications that execute over the PPPoA
or PPPoEoA session.
A nested, 2-level hierarchical service policy is used to configure session shaping directly on the router
using the modular quality of service command-line interface
(MQC):
• Child policy [of the hierarchical service policy]—Defines QoS actions using QoS commands such
as the priority, bandwidth, and police commands.
• Parent policy—Contains only the class-default class with the shape or bandwidth remaining ratio
command configured, or with both commands configured:
– shape command—Shapes the session traffic to the specified bit rate, according to a specific
algorithm.
– bandwidth remaining ratio command—Specifies a ratio value that the router uses to
determine how much unused bandwidth to allocate to the session during congestion.
For more information about nested hierarchical policies, see the “Nested Hierarchical Policies” section
on page 13-6.

Cisco 10000 Series Specifications

General

Brand	Cisco
Model	10000 Series
Category	Network Router
Language	English