Feature History For Qos Service Accounting; Prerequisites For Qos Service Accounting; Restrictions For Qos Service Accounting; Ancp Corrected Rate - Cisco 10000 Series Configuration Manual

Chapter 7 Traffic Accounting
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If the ISG replicates QoS VSAs in a service start message, the ISG replicates the same QoS VSAs in the
corresponding service accounting stop message.

Feature History for QoS Service Accounting

Cisco IOS Release
Release 12.2(31)ZV1

Prerequisites for QoS Service Accounting

Service accounting must be configured on the ISG for a service before QoS accounting can occur. For
more information, see
No other configuration is required to enable QoS service accounting.

Restrictions for QoS Service Accounting

If more than one ISG service policy is included in the RADIUS Access-Accept or CoA message and a
QoS VSA is also included, then the ISG replicates the QoS VSA in the service accounting record for
only one of the ISG services with accounting configured.

ANCP Corrected Rate

In an ANCP environment, the BRAS must set the subscriber shaping rate to the exact rate communicated
to the BRAS by the DSLAM. To do this, the BRAS must take into account the ATM line encapsulation
overhead. The way in which the BRAS does this depends on the PRE configured: PRE2 or PRE3.
The PRE2 uses a fixed correction factor to modify the ANCP-signaled rate. The fixed correction factor
is a user-configurable value that the PRE2 applies to the ANCP rate to account for ATM or VDSL
overhead before sending the modified rate (ANCP corrected rate) to the RADIUS server.
The PRE3 does not modify the ANCP-signaled rate and instead sends the ANCP rate to RADIUS
unmodified. However, the PRE3 requires that you configure ATM overhead accounting, which it applies
to the subinterface configuration.
When the BRAS receives a new ANCP-signaled line rate, it checks the Access-Loop-Circuit-ID that the
DSLAM sent to determine the subscriber port type. The Access-Loop-Circuit-ID is defined as:
ATM/DSL
"Access-Node-Identifier atm slot/prt[:vlan-id]"
OL-14660-03
Configured for both ISG service1 and service2, the ISG replicates the QoS VSA in the first service
accounting record sent. If the accounting start record for service1 is sent first, followed by the
service2 accounting start record, then the ISG replicates the QoS VSA in the service1 accounting
start record.
Not configured for either service, the ISG does not replicate the QoS VSA.
Description
This feature was introduced on the Cisco 10000 series
router for the PRE3.
"Enabling Per-Service Accounting on the ISG" section on page
Cisco 10000 Series Router Access Network Control Protocol Configuration Guide
ANCP Corrected Rate
PRE Required
PRE3
7-13.
7-15