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224 XSR User’s Guide

Configuring QoS for Frame Relay Chapter 10

Configuring Quality of Service

When there is no congestion each traffic class can use as much bandwidth as

is available, except the voice which is priority class and is rate-limited to a

maximum of 20 Kbps. BECN will adoptively reduce the CIR of the DLCI but

does not influence the parameters of the policy-map frame1.

Begin by creating three ACLs to define traffic classes:

XSR(config)#access-list 101 permit udp 192.168.1.0 0.0.0.255 any

eq 3000

XSR(config)#access-list 102 permit tcp 192.168.1.0 0.0.0.255 any

eq 3000

XSR(config)#access-list 103 permit ip any any

Create classification maps using a combination of ACLs or IP DSCP or

precedence bits to classify packets:

XSR(config)#class-map voice

XSR(config-cmap<voice>)#match access-group 101

XSR(config)#class-map ftp

XSR(config-cmap<ftp>)#match access-group 102

XSR(config-cmap<ftp>)#match ip dscp 18

XSR(config-cmap<ftp>)#match ip dscp 20

XSR(config)#class-map match-any class-1

XSR(config-cmap<class1>)#match access-group 103

Create a policy map consisting of one or more traffic classes and specify QoS

characteristics for each traffic class:

XSR(config)#policy-map frame1

XSR(config-pmap<frame1>)#class voice

XSR(config-pmap-c<voice>)#priority high 20 2500

XSR(config-pmap-c<voice>)#queue-limit 32

XSR(config-pmap-c<voice>)#set ip dscp 46

XSR(config-pmap<frame1>)#class ftp

XSR(config-pmap-c<frame1>)#bandwidth percent 50

XSR(config-pmap-c<frame1>)#police 30000 3000 6000 conform-

action set-dscp-transmit 10 exceed-action set-dscp-transmit 12

violate-action set-dscp-transmit 14

XSR(config-pmap-c<frame1>)#random-detect 20 35 250

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Enterasys ANG-3000 Guide de l'utilisateur Page 258