Juniper ACX2000 Configuration Guide

The Junos OS hierarchical schedulers support up to five levels of scheduler hierarchies
on MX Series devices when using enhanced queuing Dense Port Concentrators (DPCs)
or fine-grained queuing Modular Port Concentrators (MPCs), and Modular Interface Cards
(MICs). It is important to know the capabilities of your hardware with respect to HCoS.
The following are a few tips to help you:
•
Only certain hardware supports the five-level scheduler hierarchy of HCoS.
•
The number of queues and logical interfaces supported is dependent upon exactly
what hardware you are using.
•
The MX Series Packet Forwarding Engine handles guaranteed bandwidth and scheduler
node weight differently than other Packet Forwarding Engines.
•
The fine-grained queuing MPCs and MICs have a certain granularity with respect to
the shaping and delay buffer values. The values used are not necessarily exactly the
values configured.
To learn more about platform support for HCoS, use the Juniper Networks Feature Explorer
(http://pathfinder.juniper.net/feature-explorer/). In the Feature Explorer, search on
hierarchical schedulers.
In addition, it is important to note the following:
•
HCoS is most frequently used to enforce service level agreements at the subscriber
edged using dynamic traffic control profiles.
•
Hierarchical schedulers can also be applied to Ethernet pseudowire interfaces,
aggregated Ethernet interfaces, Layer 2 Tunnel Protocol (L2TP) network server (LNS)
inline services, and GRE tunnels.
•
Hierarchical ingress policing is a feature that is complimentary to and often used in
conjunction with HCoS.
•
There are other features in Junos OS that have similar sounding names.
NOTE: The hierarchical scheduler and shaper feature supported on the SRX
Series devices is not the HCoS feature described here.
Before planning HCoS for you network, you should learn about HCoS, define you needs,
plan how you want to implement HCoS, and test the operation in a simulated environment.
Table 53: Resources for Learning More About HCoS
DescriptionDocument
This book is a good resource for learning the basics of CoS on Juniper
Networks devices.
Day One: Deploying Basic QoS Juniper
Networks Books
Learn about the advanced features of HCoS. This book provides an in-depth
description of how HCoS works and how it can be deployed. It also provides
a lab tested topology and configuration example.
Juniper MX-Series O'Reilly Media
935Copyright © 2017, Juniper Networks, Inc.
Chapter 27: Configuring Class of Service

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English