l Show frame-relay pvc [ dlci | interface ]
l Show frame-relay lmi
l Show frame-relay map
l Debug frame-relay lmi
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
out bytes 1898 dropped pkts
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
out bytes 1898 dropped pkts
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
out bytes 2426 dropped pkts
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。
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)#
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(0x131,0x
broadcast,
CISCO, status defined, active
Serial1/0 (up): ip 172.16.1.2 dlci 305(0x131,0x
broadcast,
CISCO, status defined, active
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
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
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
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。