Hierarchical CoS Shaping-Rate Adjustments Overview
This overview describes how MX Series Ethernet Services Routers installed as a an edge router in a subscriber access network can adjust hierarchical class-of-service (CoS) policy to prevent bandwidth contention at subscriber interfaces on Enhanced Queuing Dense Port Concentrator (EQ DPC) ports and the Trio MPC/MIC family of products.
Hierarchical, per-subscriber CoS is supported only for subscriber interfaces on EQ DPC or Trio MPC/MIC interfaces operating in hierarchical scheduler mode. These types of subscriber interfaces can be static VLAN interfaces or static interface sets. Hierarchical CoS enables you to apply traffic shaping parameters (which can include a delay-buffer bandwidth) and packet transmission scheduling parameters (which can include buffer management parameters) to an individual subscriber interface rather than to all interfaces configured on the port.
The characteristics of voice, data, and video applications vary widely in their requirements for traffic throughput, bandwidth management, delay and jitter tolerance, and buffer depth. To enhance the flexibility of the hierarchical CoS implementation in a subscriber access network, you can configure the MX Series router to perform real-time adjustments to the shaping rate configured for subscriber interfaces for residential gateways. Enabling a shaping-rate adjustment option on the router can prevent bandwidth contention at the interface from causing degradation of the subscriber’s voice, data, or video services.
Related Topics
- CoS Shaping-Rate Adjustments for Subscriber Local Loops Overview
- Guidelines for Configuring CoS Shaping-Rate Adjustments for Subscriber Local Loops
- Enabling CoS Shaping-Rate Adjustments for Subscriber Local Loops
- Disabling CoS Shaping-Rate Adjustments for Subscriber Local Loops
- Disabling Hierarchical Bandwidth Adjustment for Subscriber Interfaces with Reverse-OIF Mapping
- Example: Configuring Hierarchical CoS Shaping-Rate Adjustments for Subscriber Local Loops
