1、帧中继解析
1、属于有连接的二层网络技术
2、DLCI（数据链路连接标识）在路由器和帧中继交换机之间标识PVC，本地有效
3、PVC（永久虚电路）
4、LMI（本地管理接口）路由器和帧中继交换机之间的一种信令标准，负责管理设备之间的连接及维护其连接状态。
5、MAP IP 和DLCI 的映射表
2、PVC（LMI）状态
| PVC（LMI）状态 | 本端 | 对端 |
| Active | 正常 | 正常 |
| Inactive | 正常 | 不正常 |
| Delete | 不正常 | 未知 |
3、实验拓扑
4、实验配置
R1配置
interface Serial0/0
ip address 145.1.1.1 255.255.255.0
encapsulation frame-relay
frame-relay lmi-type cisco
no shut
R2配置
frame-relay switching
interface Tunnel2
tunnel source 23.1.1.2
tunnel destination 23.1.1.3
interface Serial0/0
encapsulation frame-relay
clock rate 64000
frame-relay lmi-type cisco
frame-relay intf-type dce
frame-relay route 104 interface Serial0/1 401
frame-relay route 105 interface Tunnel2 100
no shut
interface Serial0/1
encapsulation frame-relay
clock rate 64000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 401 interface Serial0/0 104
no shut
interface FastEthernet1/0
ip address 23.1.1.2 255.255.255.0
no shut
R3配置
frame-relay switching
interface Tunnel3
tunnel source 23.1.1.3
tunnel destination 23.1.1.2
interface Serial0/0
encapsulation frame-relay
clock rate 64000
frame-relay lmi-type q933a
frame-relay intf-type dce
frame-relay route 501 interface Tunnel3 100
no shut
interface FastEthernet1/0
ip address 23.1.1.3 255.255.255.0
no shut
R4配置
interface Serial0/0
ip address 145.1.1.4 255.255.255.0
encapsulation frame-relay
frame-relay map ip 145.1.1.5 401 broadcast
frame-relay lmi-type ansi
no shut
R5配置
interface Serial0/0
ip address 145.1.1.5 255.255.255.0
encapsulation frame-relay
frame-relay map ip 145.1.1.4 501 broadcast
frame-relay lmi-type q933a
no shut
5、查看
