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1、第十二章应用帧中继实现广域网连接,通过本章的学习，您应该掌握以下内容：了解 Frame Relay 工作过程配置 Frame Relay配置 Frame Relay 的子端口查看 Frame Relay 信息,本章目标,Frame Relay 概述,使用虚电路进行连接提供面向对象的服务,Frame Relay works here.,DCE or FrameRelay Switch,CSU/DSU,Frame Relay 栈,OSI 参考模型,Frame Relay,Physical,Presentation,Session,Transport,Network,Data Link,Applic
2、ation,EIA/TIA-232,EIA/TIA-449,V.35,X.21,EIA/TIA-530,Frame Relay,IP/IPX/AppleTalk,etc.,Frame Relay 术语,LocalAccessLoop=T1,Local AccessLoop=64 kbps,Local AccessLoop=64 kbps,DLCI:400,PVC,DLCI:500,LMI100=Active400=Active,DLCI:200,DLCI:100,PVC,CSU/DSU,Frame Relay 地址映射,从提供商那里得到本地的DLCI号 建立目的地址和本地DLCI之间的映射关系
3、,DLCI:500,PVC,Inverse ARP orFrame Relay map,IP(10.1.1.1),FrameRelay,DLCI(500),Frame Relay 信号,Cisco 路由器支持三种 LMI 标准:CiscoANSI T1.617 Annex DITU-T Q.933 Annex A,DLCI:400,PVC,Keepalive,CSU/DSU,DLCI:500,PVC,x,LMI500=Active400=Inactive,Frame Relay 的反转 ARP 协议和 LMI 工作,Frame RelayCloud,1,DLCI=100,DLCI=400,Fr
4、ame Relay 的反转 ARP 协议和 LMI 工作,2,Status Inquiry,2,Status Inquiry,Frame RelayCloud,1,DLCI=100,DLCI=400,Frame Relay 的反转 ARP 协议和 LMI 工作,3,Local DLCI 100=Active,4,Local DLCI 400=Active,2,Status Inquiry,2,Status Inquiry,Frame RelayCloud,1,DLCI=100,DLCI=400,3,Frame Relay 的反转 ARP 协议和 LMI 工作,4,Hello,I am 172.
5、168.5.5.,3,Local DLCI 100=Active,4,Local DLCI 400=Active,2,Status Inquiry,2,Status Inquiry,Frame RelayCloud,1,DLCI=100,DLCI=400,3,Frame Relay 的反转 ARP 协议和 LMI 工作,Hello,I am 172.168.5.7.,4,5,Frame Relay Map172.168.5.5 DLCI 400 Active,Frame RelayCloud,DLCI=100,DLCI=400,Frame Relay Map172.168.5.7 DLCI 1
6、00 Active,5,Frame Relay 的反转 ARP 协议和 LMI 工作,Hello,I am 172.168.5.7.,4,5,Frame Relay Map172.168.5.5 DLCI 400 Active,Frame RelayCloud,DLCI=100,DLCI=400,Frame Relay Map172.168.5.7 DLCI 100 Active,5,Hello,I am 172.168.5.5.,6,Frame Relay 的反转 ARP 协议和 LMI 工作,Keepalives,Keepalives,Hello,I am 172.168.5.7.,4,5
7、,Frame Relay Map172.168.5.5 DLCI 400 Active,Frame RelayCloud,DLCI=100,DLCI=400,Frame Relay Map172.168.5.7 DLCI 100 Active,5,Hello,I am 172.168.5.5.,6,7,7,Rel.11.2 Router,Rel.10.3 Router,interface Serial1 encapsulation frame-relay bandwidth 64,interface Serial1 encapsulation frame-relay bandwidth 64
8、frame-relay lmi-type ansi,HQ,Branch,配置 Frame Relay,反转 ARP缺省情况下是激活的在配置输出信息中看不出来,Rel.11.2 Router,Rel.10.3 Router,HQ,interface Serial1 encapsulation frame-relay bandwidth 64,interface Serial1 encapsulation frame-relay bandwidth 64 frame-relay lmi-type ansi,Branch,配置 Frame Relay,DLCI=110,p1r1,DLCI=100,i
9、nterface Serial1encapsulation frame-relaybandwidth 64frame-relay map ip 10.16.0.2 110 broadcast,HQ,Branch,配置静态的 Frame Relay 映射,查看 Frame Relay 信息,显示协议、DLCI、和 LMI 的相关信息,Router#show interface s0Serial0 is up,line protocol is up Hardware is HD64570 MTU 1500 bytes,BW 1544 Kbit,DLY 20000 usec,rely 255/255
10、,load 1/255 Encapsulation FRAME-RELAY,loopback not set,keepalive set(10 sec)LMI enq sent 19,LMI stat recvd 20,LMI upd recvd 0,DTE LMI up LMI enq recvd 0,LMI stat sent 0,LMI upd sent 0 LMI DLCI 1023 LMI type is CISCO frame relay DTE FR SVC disabled,LAPF state down Broadcast queue 0/64,broadcasts sent
11、/dropped 8/0,interface broadcasts 5 Last input 00:00:02,output 00:00:02,output hang never Last clearing of show interface counters never Queueing strategy:fifo Output queue 0/40,0 drops;input queue 0/75,0 drops,显示 LMI 信息,Router#show frame-relay lmi LMI Statistics for interface Serial0(Frame Relay DT
12、E)LMI TYPE=CISCO Invalid Unnumbered info 0 Invalid Prot Disc 0 Invalid dummy Call Ref 0 Invalid Msg Type 0 Invalid Status Message 0 Invalid Lock Shift 0 Invalid Information ID 0 Invalid Report IE Len 0 Invalid Report Request 0 Invalid Keep IE Len 0 Num Status Enq.Sent 113100 Num Status msgs Rcvd 113
13、100 Num Update Status Rcvd 0 Num Status Timeouts 0,查看 Frame Relay 信息,显示 PVC 数据通讯信息,查看 Frame Relay 信息,Router#show frame-relay pvc 100PVC Statistics for interface Serial0(Frame Relay DTE)DLCI=100,DLCI USAGE=LOCAL,PVC STATUS=ACTIVE,INTERFACE=Serial0 input pkts 28 output pkts 10 in bytes 8398 out bytes
14、1198 dropped pkts 0 in FECN pkts 0 in BECN pkts 0 out FECN pkts 0 out BECN pkts 0 in DE pkts 0 out DE pkts 0 out bcast pkts 10 out bcast bytes 1198 pvc create time 00:03:46,last time pvc status changed 00:03:47,显示路由信息,Router#show frame-relay mapSerial0(up):ip 10.140.1.1 dlci 100(0 x64,0 x1840),dynam
15、ic,broadcast,status defined,active,查看 Frame Relay 信息,清除动态的Frame Relay 映射关系,查看 Frame Relay 信息,Router#show frame-relay mapSerial0(up):ip 10.140.1.1 dlci 100(0 x64,0 x1840),dynamic,broadcast,status defined,activeRouter#clear frame-relay-inarpRouter#sh frame mapRouter#,显示 LMI 的调试信息,查看 Frame Relay 信息,Rou
16、ter#debug Frame lmiFrame Relay LMI debugging is onDisplaying all Frame Relay LMI dataRouter#1w2d:Serial0(out):StEnq,myseq 140,yourseen 139,DTE up1w2d:datagramstart=0 xE008EC,datagramsize=131w2d:FR encap=0 xFCF103091w2d:00 75 01 01 01 03 02 8C 8B1w2d:1w2d:Serial0(in):Status,myseq 1401w2d:RT IE 1,leng
17、th 1,type 11w2d:KA IE 3,length 2,yourseq 140,myseq 1401w2d:Serial0(out):StEnq,myseq 141,yourseen 140,DTE up1w2d:datagramstart=0 xE008EC,datagramsize=131w2d:FR encap=0 xFCF103091w2d:00 75 01 01 01 03 02 8D 8C1w2d:1w2d:Serial0(in):Status,myseq 1421w2d:RT IE 1,length 1,type 01w2d:KA IE 3,length 2,yours
18、eq 142,myseq 1421w2d:PVC IE 0 x7,length 0 x6,dlci 100,status 0 x2,bw 0,Star(Hub and Spoke),Full Mesh,Partial Mesh,Frame Relay default:nonbroadcast,multiaccess(NBMA),选择 Frame Relay 拓扑结构,问题:广播帧必须复制给其它已经建立的连接,RoutingUpdate,A,C,B,路由信息的可达性,B,C,D,A,实现路由信息的可达性,解决方法:在NBMA环境的网络中使用水平分割可能造成一些问题划分子端口可以解决水平分割造成的
19、问题一个物理端口可以被划分成多个逻辑意义上的子端口,Subnet A,Subnet B,Subnet C,S0,PhysicalInterface,Logical Interface,子端口的配置,点到点子端口看作是专线 没一个点到点连接的子端口要求由自己的子网 适用于星型拓扑结构 多点子端口应用在 NBMA 网络，因此它们无法解决水平分割所带来的问题由于使用的是单独的子网可以保存地址空间适用于 partial-mesh 和 full-mesh 拓扑结构中,A,10.17.0.1s0.2,B,配置点到点的子端口,interface Serial0 no ip address encapsula
20、tion frame-relay!interface Serial0.2 point-to-pointbandwidth 64 frame-relay interface-dlci 110!interface Serial0.3 point-to-pointbandwidth 64 frame-relay interface-dlci 120!,s0.3,C,DLCI=110,DLCI=120,interface Serial2 no ip address encapsulation frame-relay!interface Serial2.2 multipointbandwidth 64
21、frame-relay map ip 10.17.0.2 120 broadcast frame-relay map ip 10.17.0.3 130 broadcast frame-relay map ip 10.17.0.4 140 broadcast,RTR1,B,RTR3,RTR4,多点子端口配置举例,DLCI=120,DLCI=130,DLCI=140,可视化目标,podros s0E10.140.5.2F10.140.6.2H10.140.8.2I10.140.9.2J10.140.10.2,core_ server,wg_sw_a10.2.2.11,wg_sw_l10.13.13
22、.11,wg_pc_a,wg_pc_l,wg_ro_a,e0/1,e0/2,e0/2,e0/1,e0,e0,fa0/23,core_sw_a,wg_ro_l,core_ro,fa0/24,fa0/0,FR,.,10.13.13.3,PPP with CHAP,PPP with CHAP,s0,s0,s2/7.x,了解 Frame Relay 工作过程配置 Frame Relay配置 Frame Relay 的子端口查看 Frame Relay 信息,本章总结,完成本章的学习后，你应该能够掌握：,1.什么是 DLCI?2.在Cisco路由器上，用那两种方法可以建立本地DLCI和目标地址之间的映射关系?3.配置Frame Relay的子端口有何好处?,问题回顾,
