典型的qos设置-ECN+WRED

　　 
　　[CODE]
　　policy-map prova-base
　　description This policy allows to apply ECN+WRED at the output queue interface
　　class class-default
　　fair-queue
　　random-detect
　　random-detect ecn

　　random-detect precedence 0 100 300 2 //syntax: precedence min_threshold max_threshold mark_probability_denominator
　　
　　
　　interface ATM1/0/0.200 point-to-point
　　description to ciscotest (shaping)
　　bandwidth 50000
　　ip address 192.168.3.1 255.255.255.248
　　pvc 200/200
　　vbr-nrt 50000 50000 1
　　encapsulation aal5snap
　　!
　　service-policy output prova-base
　　
　　
　　--------------------------------------------------------------
　　
　　dsdeis#sh vers
　　Cisco Inte.network Operating System Software
　　IOS (tm) RSP Software (RSP-PV-M), Version 12.2(6.3)PI, MAINTENANCE INTERIM SOFTWARE
　　TAC Support: http://www.cisco.com/tac
　　Copyright (c) 1986-2001 by cisco Systems, Inc.
　　Compiled Tue 20-Nov-01 18:39 by dchih
　　Image text-base: 0x60010948, data-base: 0x615C0000
　　
　　ROM: System Bootstrap, Version 11.1(2) [nitin 2], RELEASE SOFTWARE (fc1)
　　BOOTLDR: RSP Software (RSP-BOOT-M), Version 12.0(1a), RELEASE SOFTWARE (fc1)
　　
　　dsdeis uptime is 16 weeks, 4 hours, 33 minutes
　　System returned to ROM by reload
　　System restarted at 11:01:54 UTC Fri Nov 30 2001
　　System image file is "tftp://UNKNOWN/rsp-pv-mz.tiziana"
　　
　　cisco RSP2 (R4700) processor with 65536K/2072K bytes of memory.
　　R4700 CPU at 100Mhz, Implementation 33, Rev 1.0
　　Last reset from power-on
　　G.703/E1 software, Version 1.0.
　　G.703/JT2 software, Version 1.0.
　　X.25 software, Version 3.0.0.
　　Chassis Interface.
　　1 VIP2 R5K controller (1 FastEthernet)(1 ATM).
　　1 FastEthernet/IEEE 802.3 interface(s)
　　1 ATM network interface(s)
　　123K bytes of non-volatile configuration memory.
　　
　　20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
　　8192K bytes of Flash internal SIMM (Sector size 256K).
　　No slave installed in slot 3.
　　Configuration register is 0x102
　　
　　
　　dsdeis#sh pol inter atm 1/0/0.200
　　
　　ATM1/0/0.200
　　
　　Service-policy output: prova-base
　　
　　Class-map: class-default (match-any)
　　0 packets, 0 bytes
　　30 second offered rate 0 bps, drop rate 0 bps
　　Match: any
　　queue size 0, queue limit 724
　　packets output 0, packet drops 0
　　tail/random drops 0, no buffer drops 0, other drops 0
　　Fair-queue: per-flow queue limit 181
　　Random-detect:
　　Exp-weight-constant: 9 (1/512)
　　Mean queue depth: 0
　　Class ECN Random Tail Minimum Maximum Mark Output
　　marked drop drop threshold threshold probability packets
　　0 0 0 0 100 300 1/2 0
　　1 0 0 0 0 0 1/10 0
　　2 0 0 0 0 0 1/10 0
　　3 0 0 0 0 0 1/10 0
　　4 0 0 0 0 0 1/10 0
　　5 0 0 0 0 0 1/10 0
　　6 0 0 0 0 0 1/10 0
　　7 0 0 0 0 0 1/10 0
　　
　　
　　{/CODE]

原文转自：http://www.ltesting.net