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Related Documentation
Setting a Global Adjustment Factor per DSL Subscriber Line for ANCP-Reported Traffic Rates
When a DSLAM calculates the data rate on the subscriber local loop, it ignores the additional headers on the DSL line that are associated with the overhead of the access mode (ATM or Ethernet). When ANCP reports the upstream data rate or the downstream data rate, it includes the headers in its calculation and therefore reports a slightly higher value than that calculated by the DSLAM. This discrepancy reduces the accuracy of the CoS shaping rate.
 | Note: ANCP always reports both upstream and downstream rates to AAA. ANCP reports only downstream data rates to CoS, and reports to CoS only when you include the qos-adjust statement at the [edit protocols ancp] hierarchy level. |
You can configure ANCP to adjust the traffic rate to account for the header overhead by including one or more of the qos-adjust-dsl-line-type statements. Each of these statements sets an adjustment factor for a particular DSL line type that applies a percentage value to the total downstream and upstream data rates reported by ANCP. That is, you configure the statements for all relevant line types, and ANCP applies the appropriate adjustment when it identifies the line type for the interface. The adjustment factor applies globally for all subscribers of that DSL line type. By default, ANCP applies an adjustment factor of 100 percent to all DSL lines, meaning that no adjustment is made. ANCP simply passes on the DSL line rates that include the header information.
To apply a global adjustment factor for DSL subscriber lines:
- Specify that ANCP reports traffic rates to CoS.[edit protocols ancp]user@host# set qos-adjust
- Specify the adjustment factor percentage for the desired
subscriber line.[edit protocols ancp]user@host# set qos-adjust-adsl adjustment-factoruser@host# set qos-adjust-adsl2 adjustment-factoruser@host# set qos-adjust-adsl2-plus adjustment-factoruser@host# set qos-adjust-sds1 adjustment-factoruser@host# set qos-adjust-vds1 adjustment-factoruser@host# setqos-adjust-vds2 adjustment-factor
