Supported Platforms
Related Documentation
- MX Series
- Traffic Rate Reporting and Adjustment by ANCP
- Configuring ANCP
- ANCP Topology Discovery and Traffic Reporting Overview
- Shaping Rate Adjustments for Subscriber Local Loops Overview
- Guidelines for Configuring Shaping-Rate Adjustments for Subscriber Local Loops
- Enabling Shaping-Rate Adjustments for Subscriber Local Loops
- Disabling Shaping-Rate Adjustments for Subscriber Local Loops
- Specifying How Long Processes Wait for ANCP Restart to Complete
- maximum-helper-restart-time
Configuring the ANCP Agent to Report Traffic Rates to CoS
By default, the ANCP agent does not report the traffic rate on subscriber access lines to CoS. You can include the qos-adjust statement at the [edit protocols ancp] hierarchy level to configure the ANCP agent to report unadjusted or net downstream data rates to CoS for all subscribers in the network. This information enables CoS to subsequently shape the traffic on these access lines.
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). The unadjusted downstream data rate includes these headers in its calculation and therefore reports a slightly higher value than that calculated by the DSLAM. The ANCP agent also reports to CoS the traffic mode and the traffic rate overhead.
 | Note: The ANCP agent never reports upstream traffic rates to CoS, nor does it report adjusted downstream traffic rates to CoS. |
If CoS does not receive a keepalive message within the maximum helper restart time, it considers ANCP to be down and immediately reverts to the configured values any traffic shaping updates that were modified as a result of traffic reports from the ANCP agent. The configured values are maintained until ANCP comes back up and sends fresh traffic updates to CoS.
However, if ANCP remains running but loses the connection to a neighbor, CoS does not revert to its configured values. In this case, CoS changes the shaping rate for the subscriber traffic only if the ANCP agent restores the connection to that neighbor and reports new traffic rates to CoS or if you remove the qos-adjust statement.
To configure the ANCP agent to report unadjusted downstream traffic rates to CoS for traffic shaping:
- Specify that the ANCP agent reports traffic rates to CoS.[edit protocols ancp]user@host# set qos-adjust
Related Documentation
- MX Series
- Traffic Rate Reporting and Adjustment by ANCP
- Configuring ANCP
- ANCP Topology Discovery and Traffic Reporting Overview
- Shaping Rate Adjustments for Subscriber Local Loops Overview
- Guidelines for Configuring Shaping-Rate Adjustments for Subscriber Local Loops
- Enabling Shaping-Rate Adjustments for Subscriber Local Loops
- Disabling Shaping-Rate Adjustments for Subscriber Local Loops
- Specifying How Long Processes Wait for ANCP Restart to Complete
- maximum-helper-restart-time
Published: 2013-07-31
Supported Platforms
Related Documentation
- MX Series
- Traffic Rate Reporting and Adjustment by ANCP
- Configuring ANCP
- ANCP Topology Discovery and Traffic Reporting Overview
- Shaping Rate Adjustments for Subscriber Local Loops Overview
- Guidelines for Configuring Shaping-Rate Adjustments for Subscriber Local Loops
- Enabling Shaping-Rate Adjustments for Subscriber Local Loops
- Disabling Shaping-Rate Adjustments for Subscriber Local Loops
- Specifying How Long Processes Wait for ANCP Restart to Complete
- maximum-helper-restart-time
