CCNA之八：背对背帧中继
环境：两台路由器，由串口相连。
要求：用两台路由器来模拟帧中继环境，fr-sw为帧中继交换机，并使用静态路由使网络联通。
步骤一：配置帧中继及联通性
fr-sw的配置：
fr-sw (config)#frame-relay switching à启用帧中继交换机
fr-sw (config)#interface loopback 0
fr-sw (config-if)#ip address 1.1.1.1 255.0.0.0
fr-sw (config-if)#interface serial 0
fr-sw (config-if)#encapsulation frame-relay à封装帧中继
fr-sw (config-if)#frame-relay intf-type dce à时钟提供端
fr-sw (config-if)#clock rate 64000
fr-sw (config-if)#ip address 10.1.1.1 255.255.255.0
fr-sw (config-if)#frame-relay map ip 10.1.1.2 102 broadcastà启用静态映射,此DLCI号码同时也是分配给对端设备的DLCI。因此，要求两端的DLCI号码必须相同。
fr-sw (config-if)#frame-relay map ip 10.1.1.1 102 broadcastà指向自己的目的，是为了PING通本路由器的接口。
fr-sw (config-if)#no shutdown
r2的配置
r2(config)#interface loopback 0
r2(config-if)#ip address 2.2.2.2 255.0.0.0
r2(config-if)#interface serial0
r2(config-if)#encapsulation frame-relay
r2(config-if)#ip address 10.1.1.2 255.255.255.0
r2(config-if)#frame-relay map ip 10.1.1.1 102 broadcastà与对端相同。
r2(config-if)#frame-relay map ip 10.1.1.2 102 broadcastà与对端相同。
r2(config-if)#no shutdown
步骤二、配置路由
fr-sw (config)#ip route 2.2.2.0 255.255.255.0 10.1.1.2
r2(config)#ip route 1.1.1.0 255.255.255.0 10.1.1.1
步骤三、测试
fr-sw #ping ip
Target IP address: 2.2.2.2
Extended commands [n]: y
Source address or interface: 1.1.1.1
!!!!!
r2#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Extended commands [n]: y
Source address or interface: 2.2.2.2
!!!!!
步骤四、查看状态
fr-sw的帧中继状态
fr-sw #show frame-relay pvc à查看PVC状态
PVC Statistics for interface Serial0 (Frame Relay DCE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0
input pkts 69 output pkts 49 in bytes 6074
out bytes 5052 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
pvc create time 00:48:44, last time pvc status changed 00:47:23
fr-sw #show frame-relay map à查看帧中继映射
Serial0 (up): ip 10.1.1.1 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial0 (up): ip 10.1.1.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
r2帧中继的状态:
r2#show frame-relay pvc à显示PVC状态
PVC Statistics for interface Serial0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0
input pkts 26 output pkts 35 in bytes 2660
out bytes 3137 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 9 out bcast bytes 477
pvc create time 00:20:07, last time pvc status changed 00:20:07
r2#show frame-relay map à显示帧中继映射
Serial0 (up): ip 10.1.1.1 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial0 (up): ip 10.1.1.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
步骤五、显示当前配置
fr-sw的当前配置：
fr-sw #show running-config
hostname fr-sw
!
frame-relay switching
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface Serial0
ip address 10.1.1.1 255.255.255.0
encapsulation frame-relay
clockrate 64000
frame-relay map ip 10.1.1.1 102 broadcast
frame-relay map ip 10.1.1.2 102 broadcast
frame-relay intf-type dce
!
ip route 2.2.2.0 255.255.255.0 10.1.1.2
!
end
r2的当前配置：
r2#show running-config
hostname r2
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.0
!
interface Serial0
ip address 10.1.1.2 255.255.255.0
encapsulation frame-relay
frame-relay map ip 10.1.1.1 102 broadcast
frame-relay map ip 10.1.1.2 102 broadcast
!
ip route 1.1.1.0 255.255.255.0 10.1.1.1
!
end