Configuring CoS on MPLS Provider Edge Switch Using IP Over MPLS (CLI Procedure)
You can use class of service (CoS) within MPLS networks to prioritize certain types of
traffic during periods of congestion. This topic describes configuring CoS components
on a provider edge (PE) switch that is using IP Over MPLS.
This task describes now to create a custom DSCP classifier and a custom EXP rewrite
rule on the ingress PE switch. It includes configuring a policer firewall filter and applying
it to the customer-edge interface of the ingress PE switch. The policer firewall filter
ensures that the amount of traffic forwarded through the MPLS tunnel never exceeds
the requested bandwidth allocation.
For this procedure, we assume that the switch has already been configured for MPLS.
See “Configuring MPLS on Provider Edge Switches Using IP Over MPLS (CLI Procedure)”
on page 3401.
1.
Import the default DSCP classifier classes to the custom DSCP classifier that you are
creating:
[edit class-of-service]
user@switch#
set classifiers dscp dscp1
import
default
2.
Add the expedited-forwarding class to this custom DSCP classifier, specifying a loss
priority and code point:
[edit class-of-service]
user@switch#
set classifiers dscp dscp1 forwarding-class expedited-forwarding
loss-priority low code-points 000111
3.
Specify the values for the custom EXP rewrite rule,
e1
:
[edit class-of-service]
user@switch#
set rewrite-rules exp e1 forwarding-class expedited-forwarding
loss-priority low code-point 111
4.
Specify the number of bits per second permitted, on average, for the firewall policer,
which will later be applied to the customer-edge-interface:
[edit firewall]
set
policer
mypolicer
if-exceeding bandwidth-limit
500m
5.
Specify the maximum size permitted for bursts of data that exceed the given
bandwidth limit for this policer:
[edit firewall policer]
set mypolicer if-exceeding
burst-size-limit
33553920
6.
Discard traffic that exceeds the rate limits for this policer:
[edit firewall policer]
set mypolicer
then
discard
7.
To reference the policer, configure a filter term that includes the policer action:
[edit firewall]
user@switch#
set
family
inet
filter
myfilter
term
t1 then policer mypolicer
8.
Apply the filter to the customer-edge interface:
Copyright © 2010, Juniper Networks, Inc.
3222
Complete Software Guide for Junos
®
OS for EX Series Ethernet Switches, Release 10.3
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...
