Juniper ACX2000 Configuration Guide

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Documentation
Overview of Assigning Service Levels to Packets Based on Multiple Packet Header
Fields on page 891
•
• Configuring a Simple Filter
• Guidelines for Applying Standard Firewall Filters on page 1049
• Using Multifield Classifiers to Set Packet Loss Priority
Understanding CoS on ATM IMA Pseudowire Interfaces Overview
ACX Series routers configured with Asynchronous Transfer Mode (ATM) inverse
multiplexing for ATM (IMA) pseudowire interfaces support class of service (CoS) features
for ingress and egress traffic. Policing is performed by monitoring the configured
parameters on incoming traffic to conserve resources by dropping traffic that might not
meet those configured parameters. Egress shaping uses queuing and scheduling to
control the bandwidth used. Fixed classification is provided per interface.
NOTE: ACX5048 and ACX5096 routers do not support ATM IMA pseudowire
configurations.
ATM IMA pseudowires with the following encapsulation are supported:
•
atm-ccc-cell-relay
•
atm-ccc-vc-mux
The following ATM IMA CoS features are supported:
•
Cell-Based ATM Policing on page 895
•
Cell-Based ATM Shaping on page 896
•
Fixed Classification on page 896
Cell-Based ATM Policing
Policing, or rate limiting, enables you to limit the amount of traffic that passes into or out
of the interface. Policing works with firewall filters to thwart denial-of-service (DoS)
attacks. Networks police traffic by limiting the input or output transmission rate of a class
of traffic on the basis of user-defined criteria. The ATM policer controls the maximum
rate of traffic sent from or received on the interface on which it is applied. To apply limits
to the traffic flow, configure the cdvt and peak-rate parameters within the policer. Define
the policing-action parameter as discard, discard-tag, or count to set a consequence for
the packets that exceed these limits. The consequence of configuring the discard-tag
statement is usually a higher loss priority so that if those packets encounter downstream
congestion, they are discarded first.
895Copyright © 2017, Juniper Networks, Inc.
Chapter 27: Configuring Class of Service

Juniper ACX2000 Specifications

General

Brand	Juniper
Model	ACX2000
Category	Network Router
Language	English