17-2
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 17 Configuring Dynamic Subscriber Services
Applying Traffic Shaping Parameters Using RADIUS Profiles
Applying Traffic Shaping Parameters Using RADIUS Profiles
Dynamic bandwidth selection (DBS) dynamically changes ATM traffic shaping parameters based on a
subscriber’s RADIUS profile. This profile contains such QoS traffic shaping parameters as:
•
Peak cell rate (PCR)
•
Sustained cell rate (SCR)
•
VC traffic management class (VBR or UBR)
The Cisco 10000 series router supports DBS for the unspecified bit rate (UBR) and variable bit
rate-nonreal time (VBR-nrt) categories of the ATM traffic management class:
•
UBR service class—The router applies only the PCR parameter to a UBR configured VC, depending
on the port configuration.
•
VBR-nrt service class—The router applies the PCR and SCR parameters to the VBR-nrt VC.
As shown in
Figure 17-1
, when a subscriber initiates a Point-to-Point Protocol (PPP) over ATM (PPPoA)
or PPP over Ethernet (PPPoE) session to the Cisco 10000 series router, DBS retrieves the RADIUS user
profile and sets the QoS parameters to the shaping parameters specified in the user profile. The profile
might contain PCR and SCR values for DBS configuration. If the profile specifies both values, DBS
configures the ATM VC service class as VBR-nrt. Otherwise, DBS configures the service class as UBR.
Figure 17-1 Dynamic Bandwidth Selection Flow
Feature History for Dynamic Bandwidth Selection
Cisco IOS Release
Description
Required PRE
Release 12.2(16)BX
The Dynamic Bandwidth Selection feature was introduced
on the PRE2. This feature is also known as Per User QoS
Using AAA Policy Name.
PRE2
Release 12.2(28)SB
This feature was integrated in Cisco IOS Release 12.2(28)SB
for the PRE2.
PRE2
AAA Server
Subscriber
ATM VC connection
1
2
3
1. PPPOA/PPPOX session begins.
2. DBS software retrieves subscriber's profile from AAA server.
3. DBS software applies the ATM VC parameters from the profile
to the VC connection.
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