Router Configuration<14>
帧中继基本配置：
Target:
帧中继基本配置
实验设备:
路由器（带串口） 2台
V.35线缆（DTE/DCE） 1对
实验原理:
帧中继的标准可以为帧中继网络中可配置和管理的永久虚电路（PVC）进行编址，帧中继永久虚电路由数据链路连接标识符（DLCI）来标识。
当帧中继为多个逻辑数据会话提供多路复用时，ISP的交换设备首先要建立一个表，该表用来将不同的DLCI值映射到出站端口，其次，当接收到一个数据帧时，交换设备分析其连接标识符，并将该数据帧发送到相应的端口。最后，在第一个数据帧发送之前，将建立一条通往目的地的完全路径。
实验拓扑图：
Step：
步骤1 路由器基本配置。
Router A(config)#interface serial 4/0
Router A(config-if)#ip address 1.1.1.1 255.255.255.0
Router A(config-if)#exit
Router A(config)#interface Fast Ethernet 1/0
Router A(config-if)#ip address 192.168.1.1 255.255.255.0
Router A(config-if)#exit
Router B(config)#interface serial 4/0
Router B(config-if)#ip address 1.1.1.2 255.255.255.0
Router B(config-if)#exit
Router B(config)#interface Fast Ethernet 1/0
Router B(config-if)#ip address 192.168.2.1 255.255.255.0
Router B(config-if)#exit
步骤2 配置帧中继。
Router A(config)#interface serial 4/0
Router A(config-if)# encapsulation frame-relay ietf
Router A(config-if)# frame-relay map ip 1.1.1.2 16
Router A(config-if)# frame-relay lmi-type ansi
Router B(config)#interface serial 4/0
Router B(config-if)# encapsulation frame-relay ietf
Router B(config-if)# frame-relay map ip 1.1.1.1 17
Router B(config-if)# frame-relay lmi-type ansi
步骤3 验证帧中继配置。
Router B#show frame-relay pvc
PVC Statistics for interface Serial1/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 17, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0
input pkts 5 output pkts 5 in bytes 520
out bytes 520 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 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 0 out bcast bytes 0
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:01:14, last time pvc status changed 00:00:48
RouterB#show frame-relay map
Serial1/0 (up): ip 1.1.1.1 dlci 17(0x11,0x410), static,
broadcast,
IETF, status defined, active
Router B#show frame-relay lmi 实验 35 帧中继基本配置 ・59・
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 13 Num Status msgs Rcvd 13
Num Update Status Rcvd 0 Num Status Timeouts 0
Last Full Status Req 00:00:05 Last Full Status Rcvd 00:00:05
【注意事项】
封装广域网协议时，要求V.35线缆的两个端口封装协议一致，否则无法建立链路。
【参考配置】
Router A#show running-config
Building configuration...
Current configuration : 574 bytes
!
version RGNOS 10.1.00(4), Release(18443)(Tue Jul 17 21:16:17 CST 2007 -ubu1server)
hostname Router A
!
interface serial 4/0
encapsulation frame-relay ietf
frame-relay map ip 1.1.1.2 16
ip address 1.1.1.1 255.255.255.0
clock rate 64000
!
interface serial 4/1
clock rate 64000
!
interface GigabitEthernet 0/0
duplex auto
speed auto
!
interface FastEthernet 1/0
ip address 192.168.1.1 255.255.255.0
duplex auto
speed auto
!
line con 0
line aux 0
line vty 0 4
login
!
end
Router B#show running-config
Building configuration...
Current configuration : 581 bytes
!
version RGNOS 10.1.00(4), Release(18443)(Tue Jul 17 21:16:17 CST 2007 -ubu1server)
hostname Router B
!
interface serial 4/0
encapsulation frame-relay ietf
frame-relay map ip 1.1.1.1 17
ip address 1.1.1.2 255.255.255.0
clock rate 64000
!
interface serial 4/1
clock rate 64000
!
interface GigabitEthernet 0/0
duplex auto
speed auto
!
interface FastEthernet 1/0
ip address 192.168.2.1 255.255.255.0
duplex auto
speed auto
!
line con 0
line aux 0
line vty 0 4
login
!
end