CCIE实验第3章 WAN协议（帧中继）之三笔记--誉天IT认证下载站

="mso-bookmark: _Toc151817828">3.3 帧中继的big show” and “big D”

l Show frame-relay pvc [ dlci | interface ]

l Show frame-relay lmi

l Show frame-relay map

l Debug frame-relay lmi

3.3.1 show frame-realy pvc命令

可以显示router上的所有PVC，显示PVC的工作状态和前向显式拥塞通知/后向显式拥塞通知和数据包的DE位等信息。例3-6 显示了在R5上的PVC信息状态：

例3-5 show frame-relay pvc 命令的信息

R5#sho frame-relay pvc

PVC Statistics for interface Serial1/0 (Frame Relay DTE)

Active Inactive Deleted Static

Local 3 0 0 0

Switched 0 0 0 0

Unused 0 0 0 0

DLCI = 502, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0.1

input pkts 30 output pkts 21 in bytes 3244

out bytes 1898 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 11 out bcast bytes 858

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

pvc create time 00:15:01, last time pvc status changed 00:15:01

DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0.1

input pkts 30 output pkts 21 in bytes 3272

out bytes 1898 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 11 out bcast bytes 858

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

pvc create time 00:15:05, last time pvc status changed 00:15:05

DLCI = 504, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0.2

input pkts 28 output pkts 27 in bytes 3132

out bytes 2426 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 27 out bcast bytes 2426

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

pvc create time 00:35:13, last time pvc status changed 00:34:03

R5#

字段“pvc create time”和“last time pvc status changed”这两个时间应该接近，如果不接近说明PVC工作状态不正常。　

根据PVC的三种状态可以判断出帧中继网络哪里有问题。

3.3.2 show frame-relay lmi命令

例3-6 Show frame-relay lmi显示LMI不匹配的信息

R3(config-if)#do sho frame-relay lmi

LMI Statistics for interface Serial1/0 (Frame Relay DTE) 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 405 Num Status msgs Rcvd 389

Num Update Status Rcvd 0 Num Status Timeouts 16

R3(config-if)#do sho frame-relay lmi

LMI Statistics for interface Serial1/0 (Frame Relay DTE) 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 426 Num Status msgs Rcvd 389

Num Update Status Rcvd 0 Num Status Timeouts 37

注意例3-6中灰色部分的字段，Num Status Enq. Sent xxx是否随着Num Status msgs Rcvd yyy的数字在增长，如果只发不收，说明交换机or LMI匹配错误。

改正LMI类型后，使用clear counters清空接口的信息，再使用show frame-relay lmi命令查看，见例3-7所示恢复正常：

例3-7 显示LMI恢复正确后的信息

R3(config-if)#do sho frame-relay lmi

LMI Statistics for interface Serial1/0 (Frame Relay DTE) LMI TYPE = ANSI

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 1 Num Status msgs Rcvd 1

Num Update Status Rcvd 0 Num Status Timeouts 0

R3(config-if)#do sho frame-relay lmi

LMI Statistics for interface Serial1/0 (Frame Relay DTE) LMI TYPE = ANSI

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 14 Num Status msgs Rcvd 14

Num Update Status Rcvd 0 Num Status Timeouts 0

R3(config-if)#

3.3.3 show frame-relay map命令

显示本与loacl router相连的remote IP adderss 的DLCI，显示是动态还是静态获得的，可以验证frame-relay map命令是否执行和检查逆向ARP工作情况。例3-8 是显示的信息：

例3-8 show frame-relay map命令输出结果

R3#sho frame-relay map

Serial1/0 (up): ip 172.16.1.5 dlci 305(0x131,0x4C10), static,

broadcast,

CISCO, status defined, active

Serial1/0 (up): ip 172.16.1.2 dlci 305(0x131,0x4C10), static,

broadcast,

CISCO, status defined, active

3.3.4 debug frame-relay lmi命令

该命令可以查看yourseq和myseq是否在递增，router收到一个序列号会将其加1并在下一次交换时以这个序列号返回，如果连续3次丢失LMI信息or keepalive，链路即复位。如果只有一个序列号改变了，说明可能是LMI不匹配造成。如果没有任何信息说明router and frame-relay switch 之间链路有连接问题。例3-9给出了正常工作时的信息：

例3-9 debug frame-relay lmi显示信息

R3#debug frame-relay lmi

Frame Relay LMI debugging is on

Displaying all Frame Relay LMI data

R3#

01:25:04: Serial1/0(out): StEnq, myseq 78, yourseen 77, DTE up

01:25:04: datagramstart = 0x5800354, datagramsize = 14

01:25:04: FR encap = 0x00010308

01:25:04: 00 75 95 01 01 01 03 02 4E 4D

01:25:04:

01:25:04: Serial1/0(in): Status, myseq 78

01:25:04: RT IE 1, length 1, type 1

01:25:04: KA IE 3, length 2, yourseq 78, myseq 78

01:25:14: Serial1/0(out): StEnq, myseq 79, yourseen 78, DTE up

01:25:14: datagramstart = 0x5801ED4, datagramsize = 14

01:25:14: FR encap = 0x00010308

01:25:14: 00 75 95 01 01 00 03 02 4F 4E

01:25:14:

01:25:14: Serial1/0(in): Status, myseq 79

01:25:14: RT IE 1, length 1, type 0

01:25:14: KA IE 3, length 2, yourseq 79, myseq 79

01:25:14: PVC IE 0x7 , length 0x3 , dlci 305, status 0x2

01:25:24: Serial1/0(out): StEnq, myseq 80, yourseen 79, DTE up

01:25:24: datagramstart = 0x5AFB034, datagramsize = 14

01:25:24: FR encap = 0x00010308

01:25:24: 00 75 95 01 01 01 03 02 50 4F

01:25:24:

01:25:24: Serial1/0(in): Status, myseq 80

01:25:24: RT IE 1, length 1, type 1

01:25:24: KA IE 3, length 2, yourseq 80, myseq 80

3.3.5 其它帧中继配置命令

l R3(config-if)#no frame-relay inverse-arp　　禁止发送逆向ARP和no arp frame-relay 命令一起使用可禁止PVC动态映射

l        R3(config-if)#no arp frame-relay　　　禁止ARP响应，和上一个命令结合使用

l        R3(config-if)#keepalive keepalive_interavl_in_seconds　　修改keepalive时间，默认为10 seconds。链路两端必须一致。

l        Clear frame-relay-inarp　　清除动态地址映射。

l        Frame-relay priority-dlci-group group_number high_dlci medium_dlci normal_dlci low_dlci　　为不同类型的帧中继使用多个并行的DLCI。


	誉天IT下载站..誉天教育集团(武汉思科专业培训.CCIE征战部落) 地址：武汉市珞瑜路78号长江传媒大厦12楼1208室网站执行:吴金龙客服QQ(报名咨询):147468 710991 360461900 电话：027-87158220、027-87678220 Copyright 2005-2007 © 51chongdian.net Inc. All Rights Reserved.