Understanding Cos On Atm Ima Pseudowire Interfaces Overview; Cell-Based Atm Policing - Juniper ACX1000 Configuration Manual

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Understanding CoS on ATM IMA Pseudowire Interfaces Overview

Cell-Based ATM Policing

Copyright © 2017, Juniper Networks, Inc.
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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
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
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
the policing-action parameter as
the packets that exceed these limits. The consequence of configuring the
statement is usually a higher loss priority so that if those packets encounter downstream
congestion, they are discarded first.
Chapter 27: Configuring Class of Service
and parameters within the policer. Define
cdvt peak-rate
discard , discard-tag , or count to set a consequence for
discard-tag
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