帧中继流量整形

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1、Yeslab安德CCIE技术文档QoS之帧中继流量整形（FRTS）来源：YesLab（）作者：周亚军2013-01-2414:27210一、理论支持对比之前的GTS （通用流量整形）的shaping，FRTS没有分类，只能针对每个独立 的VC做shaping整形，而GTS可以针对ACL等分类做整形。同样是基于令牌桶算法，如果令牌桶足够，那么做取令牌转去物理接口，如果取不到足够令牌，会缓存到ShapingQueue中，等待下一个TC间隔注满令牌FRTS 中的 shapingqueue 可以是 PQ、CQ、WFQ（而 GTS 只能是 WFQ）, FRTS 在接口调度机制中只能采用 WFQ（ GTS

2、 下为任意的调度机制）在配置FRTS的时候需要用到特殊的工具即map-class。特殊的FRTS可以来配置Tc （但是配置上去似乎没有作用，当然也可以通过Bc/Cir得到）FRTS 可以应用在帧中继的物理接口和子接口，但是必须在物理接口开启流量整形，而且物理接口的队列只能是 FIFO二、拓扑描述如下图所示，R1和R3之间通过帧中继封装连接。DLCI也已经标识完毕三、实验步骤1、物理接口的 FRTS定义map-class，在后面调用到接口或者DLCI中。在map-class中可以定义Cir等值R1(config)#map-classframe-relayFRTSR1(config-map-cla

3、ss)#frame-relaycir128000-Cir 为 128000bpsR1(config-map-class)#frame-relaybc160O0-定义 BC 为 16O00bitsR1(config-map-class)#frame-relaymincir64000-定义 MiniCir，通常为 Cir 的一 半，该值为通用流量整形中的adaptive值，也就是最多降低到多少R1(config)#ints1/0R1(config-if)#frame-relayclassFRTS- 应用 map-class 到物理接口，那么此时流量 整形是针对所有的 DLCI此时帧中继流量整形还没

4、有运行，因为在物理接口有一条开启命令：R1(config-if)#frame-relaytraffic-shaping- 任何时候开启帧中继流量整形，无论是物 理接口还是子接口都要在物理接口开启验证R1#shframe-relaypvc103 (注意一定要加 103，否则看不到效果)PVCStatisticsforinterfaceSerial1/0(FrameRelayDTE) DLCI=103,DLCIUSAGE=LOCAL,PVCSTATUS=ACTIVE,INTERFACE=Serial1/0 inputpkts140outputpkts15inbytes39235outbytes86

5、0droppedpkts0inpktsdropped0outpktsdropped0outbytesdropped0inFECNpkts0inBECNpkts0 outFECNpkts0outBECNpkts0inDEpkts0 outDEpkts0outbcastpkts10outbcastbytes3405minuteinputrate0bits/sec,0packets/sec5minuteoutputrate0bits/sec,0packets/secpvccreatetime02:05:14,lasttimepvcstatuschanged02:05:14cir128000 bc16

6、000 be0 bytelimit2000 interval125mincir64000 byteincrement2000 AdaptiveShapingnonepkts15 bytes860 pktsdelayed0 bytesdelayed0shapinginactive- 此时没有流量，所以没有激活trafficshapingdrops0Queueingstrategy:fifo-shapingqueue 队列默认为 FIFO ,可以修改成 PQ、CQ或者 WFQOutputqueue0/40,0drop,0dequeued以上验证中，cir=128O00bps , bc=16000b

7、its，所以 TC=Bc/Cir=1/8 秒=125 毫秒，但是默认情况下该值(125ms )是不能调整的面来做一些调整：R1(config)#map-classframe-relayFRTSR1(config-map-class)#frame-relayfair-queue-把 shapingqueue 从默认的 FIFO改成 WFQR1(config-map-class)#frame-relaytraffic-rate80009000- 用另外一种方式指定Cir为8000, PIR ( CIR+EIR)为9000 ,此时以该制定方式为准验证：R1#shframe-relaypvc103PV

8、CStatisticsforinterfaceSerial1/0(FrameRelayDTE)DLCI=103,DLCIUSAGE=LOCAL,PVCSTATUS=ACTIVE,INTERFACE=Serial1/0inputpkts0outputpkts0 inbytes0outbytes0droppedpkts0 inpktsdropped0outpktsdropped0outbytesdropped0inFECNpkts0inBECNpkts0 outFECNpkts0outBECNpkts0inDEpkts0 outDEpkts0outbcastpkts0outbcastbytes05

9、minuteinputrate0bits/sec,0packets/sec5minuteoutputrate0bits/sec,0packets/secpvccreatetime02:27:02,lasttimepvcstatuschanged02:27:02cir8000bc8000 be0bytelimit125interval125- 系统指定 Tc125msmincir64000 byteincrement125 AdaptiveShapingnone- 没有指定在什么情况下降速pkts0bytes0pktsdelayed0bytesdelayed0shapinginactivetra

10、fficshapingdrops0Queueingstrategy:weightedfair- 指定 shapingqueue 队列调度机制为 WFQCurrentfairqueueconfiguration:Discard Dynamic Reservedthreshold queuecount queuecount64 16 0Outputqueuesize0/maxtotal600/drops0为了有一个直观的认识，我们在R3上pi ng 些较大的报文(这种方式并不完全准确)R3#ping13.1.1.1size10000r100Typeescapesequencetoabort.Sen

11、ding100,10000-byteICMPEchosto13.1.1.1,timeoutis2seconds:Successrateis0percent(0/18)R1#shframe-relaypvc103PVCStatisticsforinterfaceSerial1/0(FrameRelayDTE)DLCI=103,DLCIUSAGE=LOCAL,PVCSTATUS=ACTIVE,INTERFACE=Serial1/0inputpkts38outputpkts35inbytes51661outbytes50740droppedpkts0inpktsdropped0outpktsdrop

12、ped0outbytesdropped0inFECNpkts0inBECNpkts0outFECNpkts0outBECNpkts0inDEpkts0 outDEpkts0outbcastpkts0outbcastbytes05minuteinputrate2000bits/sec,2packets/sec5minuteoutputrate2000bits/sec,2packets/sec pvccreatetime02:29:26,lasttimepvcstatuschanged02:29:26 cir8000 bc8000 be0 bytelimit125 interval125 minc

13、ir64000 byteincrement125 AdaptiveShapingnone pkts7 bytes10148 pktsdelayed6 bytesdelayed8644 shaping activetrafficshapingdrops0Queueingstrategy:weightedfairCurrentfairqueueconfiguration:Discard Dynamic Reservedthreshold queuecount queuecount64 16 0Outputqueuesize28/maxtotal600/drops0R1#shtraffic-shap

14、estatisticsAcc.QueuePackets Bytes Packets Bytes ShapingI/F ListDepth Delayed Delayed ActiveSe1/0 63 14 20296 13 18792 yes 通常队列 shendu 有值，那么一定会激活 shapingR1#shtraffic-shapequeueTrafficqueuedinshapingqueueonSerial1/0dlci103Queueingstrategy:weightedfairQueueingStats:63/600/64/16(size/maxtotal/threshold/

15、drops)Conversations 1/1/16(active/maxactive/maxtotal)ReservedConversations0/0(allocated/maxallocated)AvailableBandwidth64kilobits/sec(depth/weight/totaldrops/no-bufferdrops/interleaves)63/32384/16/0/0Conversation3,linktype:ip,length:1504 source:13.1.1.1,destination:13.1.1.3,id:0x001F,ttl:255,prot:12

16、、在子接口实现去掉R3上物理接口的地址，然后配置子接口R3(config)#interfaceSerial1/1.1point-to-pointR3(config-subif)#ipaddress13.1.1.3255.255.255.0 下面配置 map-class 以及应用R3(config)#map-classframe-relayEnderR3(config-map-class)#frame-relaycir256000R3(config-map-class)#frame-relaybc24000R3(config-map-class)#frame-relaytc50-手动定义 Tc，

17、但没有效果R3(config-map-class)#frame-relaymincir128000R3(config-map-class)#frame-relayadaptive-shapingbecn一定要应用到子接口的DLCI下，当然物理接口要开启整形R3(config)#ints1/1.1R3(config-subif)#frame-relayinterface-dlci301R3(config-fr-dlci)#classEnderR3(config)#ints1/1R3(config-if)#frame-relaytraffic-shapingR3#shframe-relaypvc3

18、01PVCStatisticsforinterfaceSerial1/1(FrameRelayDTE)DLCI=301,DLCIUSAGE=LOCAL,PVCSTATUS=ACTIVE,INTERFACE=Serial1/1.1inputpkts181outputpkts470inbytes215733outbytes393685droppedpkts0inpktsdropped0outpktsdropped0outbytesdropped0inFECNpkts0inBECNpkts0outFECNpkts0outBECNpkts0inDEpkts0outDEpkts0outbcastpkts

19、218 outbcastbytes666535minuteinputrate0bits/sec,0packets/sec5minuteoutputrate0bits/sec,0packets/secShapingadaptstoBECNpvccreatetime03:37:58,lasttimepvcstatuschanged03:22:28cir256000 bc24000 be0 bytelimit3000 interval93-93ms=24000/256000=0.093即 93 毫秒mincir128000 byteincrement2976 AdaptiveShapingBECN-

20、 指定在收到BECN 降速pkts482 bytes393813 pktsdelayed192 bytesdelayed276608shapinginactivetrafficshapingdrops0Queueingstrategy:fifoOutputqueue0/40,0drop,0dequeued3、嵌套 policy-map 的 FRTS可以在指定的带宽下嵌套其他某种特殊的流量赋予其带宽值R3(config)#access-list100permittcpanyanyeq80-定义 HTTP 的流量R3(config)#class-mapYeslabR3(config-cmap)#m

21、atchaccess-group100R3(config)#policy-mapYeslabR3(config-pmap)#classYeslabR3(config-pmap-c)#bandwidth10- 带宽为 10kbpsR3(config-pmap)#map-classframe-relayEnderR3(config-map-class)#service-policyoutputYeslab- 在 map-class 中嵌套之前定义的 policy-mapR3#shframe-relaypvc301PVCStatisticsforinterfaceSerial1/1(FrameRel

22、ayDTE)DLCI=301,DLCIUSAGE=LOCAL,PVCSTATUS=ACTIVE,INTERFACE=Serial1/1.1inputpkts182outputpkts479 inbytes215767outbytes396448droppedpkts0 inpktsdropped0outpktsdropped0outbytesdropped0inFECNpkts0inBECNpkts0 outFECNpkts0outBECNpkts0inDEpkts0 outDEpkts0outbcastpkts227outbcastbytes694165minuteinputrate0bit

23、s/sec,0packets/sec5minuteoutputrate0bits/sec,0packets/secShapingadaptstoBECNpvccreatetime03:47:29,lasttimepvcstatuschanged03:31:59mincir128000 byteincrement2976 AdaptiveShapingBECNbytesdelayed276608pkts492 bytes396610 pktsdelayed192shapinginactivetrafficshapingdrops0servicepolicyYeslabSerial1/1.1:DL

24、CI301-Service-policyoutput:YeslabClass-map:Yeslab(match-all)0packets,0bytes5minuteofferedrate0bps,droprate0bpsMatch:access-group100QueueingOutputQueue:Conversation25Bandwidth 10 (kbps)Max Threshold 64 (packets)(pktsmatched/bytesmatched)0/0(depth/totaldrops/no-bufferdrops)0/0/0Class-map:class-default(match-any)2packets,614bytes5minuteofferedrate0bps,droprate0bpsMatch:anyOutputqueuesize0/maxtotal600/drops0