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实验过程：
第一步  R1、R2、R3、R4、R5的预配置
R1(config)#int lo0
R1(config-if)#ip add 1.1.1.1 255.255.255.0
R1(config-if)#int s2/1
R1(config-if)#ip add 12.0.0.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#exit
R2(config)#int lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.0
R2(config-if)#int s2/1
R2(config-if)#ip add 12.0.0.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int s2/2
R2(config-if)#ip add 23.0.0.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#exit
R3(config)#int lo0
R3(config-if)#ip add 3.3.3.3 255.255.255.0
R3(config-if)#int s2/1
R3(config-if)#ip add 23.0.0.3 255.255.255.0
R3(config-if)#no sh
R3(config-if)#int s2/2
R3(config-if)#ip add 34.0.0.3 255.255.255.0
R3(config-if)#no sh
R3(config-if)#exit
R4(config)#int lo0
R4(config-if)#ip add 4.4.4.4 255.255.255.0
R4(config-if)#int s2/1
R4(config-if)#ip add 34.0.0.4 255.255.255.0
R4(config-if)#no sh
R4(config-if)#int s2/2
R4(config-if)#ip add 45.0.0.4 255.255.255.0
R4(config-if)#no sh
R4(config-if)#exit
R5(config)#int lo0
R5(config-if)#ip add 5.5.5.5 255.255.255.0
R5(config-if)#int s2/2
R5(config-if)#ip add 45.0.0.5 255.255.255.0
R5(config-if)#no sh
R5(config-if)#exit
第二步  在R1、R2、R3、R4、R5上配置OSPF
R1(config)#router ospf 64
R1(config-router)#net 0.0.0.0 0.0.0.0 a 0
R1(config-router)#end
R2(config)#router ospf 64
R2(config-router)#net 0.0.0.0 0.0.0.0 a 0
R2(config-router)#end
R3(config)#router ospf 64
R3(config-router)#net 0.0.0.0 0.0.0.0 a 0
R3(config-router)#end
R4(config)#router ospf 64
R4(config-router)#net 0.0.0.0 0.0.0.0 a 0
R4(config-router)#end
R5(config)#router ospf 64
R5(config-router)#net 0.0.0.0 0.0.0.0 a 0
R5(config-router)#end
第三步  查看R1的路由表
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
     34.0.0.0/24 is subnetted, 1 subnets
O       34.0.0.0 [110/192] via 12.0.0.2, 00:01:17, Serial2/1
     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 12.0.0.2, 00:01:17, Serial2/1
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/129] via 12.0.0.2, 00:01:17, Serial2/1
     4.0.0.0/32 is subnetted, 1 subnets
O       4.4.4.4 [110/193] via 12.0.0.2, 00:01:17, Serial2/1
     5.0.0.0/32 is subnetted, 1 subnets
O       5.5.5.5 [110/257] via 12.0.0.2, 00:01:17, Serial2/1
     23.0.0.0/24 is subnetted, 1 subnets
O       23.0.0.0 [110/128] via 12.0.0.2, 00:01:18, Serial2/1
     12.0.0.0/24 is subnetted, 1 subnets
C       12.0.0.0 is directly connected, Serial2/1
     45.0.0.0/24 is subnetted, 1 subnets
O       45.0.0.0 [110/256] via 12.0.0.2, 00:01:18, Serial2/1
R1#
第四步  查看CEF
R1#show ip cef
Prefix              Next Hop             Interface
0.0.0.0/0           drop                 Null0 (default route handler entry)
0.0.0.0/32          receive
1.1.1.0/24          attached             Loopback0
1.1.1.0/32          receive
1.1.1.1/32          receive
1.1.1.255/32        receive
2.2.2.2/32          12.0.0.2             Serial2/1
3.3.3.3/32          12.0.0.2             Serial2/1
4.4.4.4/32          12.0.0.2             Serial2/1
5.5.5.5/32          12.0.0.2             Serial2/1
12.0.0.0/24         attached             Serial2/1
12.0.0.0/32         receive
12.0.0.1/32         receive
12.0.0.255/32       receive
23.0.0.0/24         12.0.0.2             Serial2/1
34.0.0.0/24         12.0.0.2             Serial2/1
45.0.0.0/24         12.0.0.2             Serial2/1
224.0.0.0/4         drop
224.0.0.0/24        receive
255.255.255.255/32  receive
第五步  配置R1、R2、R3、R4、R5的MPLS
R1(config)#mpls label range 100 199
R1(config)#mpls label protocol ldp
R1(config)#int s2/1
R1(config-if)#mpls ip
R1(config-if)#end
R2(config)#mpls label range 200 299
R2(config)#mpls label protocol ldp
R2(config)#int s2/1
R2(config-if)#mpls ip
R2(config-if)#int s2/2
R2(config-if)#mpls ip
R2(config-if)#end
R3(config)#mpls label range 300 399
R3(config)#mpls label protocol ldp
R3(config)#int s2/1
R3(config-if)#mpls ip
R3(config-if)#int s2/2
R3(config-if)#mpls ip
R3(config-if)#end
R4(config)#mpls label range 400 499
R4(config)#mpls label protocol ldp
R4(config)#int s2/1
R4(config-if)#mpls ip
R4(config-if)#int s2/2
R4(config-if)#mpls ip
R4(config-if)#end
R5(config)#mpls label range 500 599
R5(config)#mpls label protocol ldp
R5(config)#int s2/2
R5(config-if)#mpls ip
R5(config-if)#end
第六步  检查R1的MPLS配置效果
R1#show mpls interfaces
Interface              IP            Tunnel   Operational
Serial2/1              Yes (ldp)     No       Yes        
R1#show mpls interfaces detail
Interface Serial2/1:
        IP labeling enabled (ldp):
          Interface config
        LSP Tunnel labeling not enabled
        BGP tagging not enabled
        Tagging operational
        Fast Switching Vectors:
          IP to MPLS Fast Switching Vector
          MPLS Turbo Vector
        MTU = 1500
R1#show mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop   
tag    tag or VC   or Tunnel Id      switched   interface             
100    200         34.0.0.0/24       0          Se2/1      point2point 
101    Untagged    2.2.2.2/32        0          Se2/1      point2point 
102    202         3.3.3.3/32        0          Se2/1      point2point 
103    203         4.4.4.4/32        0          Se2/1      point2point 
104    204         5.5.5.5/32        0          Se2/1      point2point 
105    Pop tag     23.0.0.0/24       0          Se2/1      point2point 
106    205         45.0.0.0/24       0          Se2/1      point2point 
R1#show mpls ldp binding
  tib entry: 1.1.1.0/24, rev 4
        local binding:  tag: imp-null
  tib entry: 1.1.1.1/32, rev 19
        remote binding: tsr: 2.2.2.2:0, tag: 201
  tib entry: 2.2.2.0/24, rev 20
        remote binding: tsr: 2.2.2.2:0, tag: imp-null
  tib entry: 2.2.2.2/32, rev 6
        local binding:  tag: 101
  tib entry: 3.3.3.3/32, rev 8
        local binding:  tag: 102
        remote binding: tsr: 2.2.2.2:0, tag: 202
  tib entry: 4.4.4.4/32, rev 10
        local binding:  tag: 103
        remote binding: tsr: 2.2.2.2:0, tag: 203
  tib entry: 5.5.5.5/32, rev 12
        local binding:  tag: 104
        remote binding: tsr: 2.2.2.2:0, tag: 204
  tib entry: 12.0.0.0/24, rev 16
        local binding:  tag: imp-null
        remote binding: tsr: 2.2.2.2:0, tag: imp-null
  tib entry: 23.0.0.0/24, rev 14
        local binding:  tag: 105
        remote binding: tsr: 2.2.2.2:0, tag: imp-null
  tib entry: 34.0.0.0/24, rev 2
        local binding:  tag: 100
        remote binding: tsr: 2.2.2.2:0, tag: 200
  tib entry: 45.0.0.0/24, rev 18
        local binding:  tag: 106
        remote binding: tsr: 2.2.2.2:0, tag: 205
R1#show mpls ldp nei
    Peer LDP Ident: 2.2.2.2:0; Local LDP Ident 1.1.1.1:0
        TCP connection: 2.2.2.2.36585 - 1.1.1.1.646
        State: Oper; Msgs sent/rcvd: 20/20; Downstream
        Up time: 00:06:57
        LDP discovery sources:
          Serial2/1, Src IP addr: 12.0.0.2
        Addresses bound to peer LDP Ident:
          12.0.0.2        23.0.0.2        2.2.2.2        
R1#show tag-switching tdp nei
//  与show mpls ldp nei效果一样
    Peer LDP Ident: 2.2.2.2:0; Local LDP Ident 1.1.1.1:0
        TCP connection: 2.2.2.2.36585 - 1.1.1.1.646
        State: Oper; Msgs sent/rcvd: 21/20; Downstream
        Up time: 00:07:38
        LDP discovery sources:
          Serial2/1, Src IP addr: 12.0.0.2
        Addresses bound to peer LDP Ident:
          12.0.0.2        23.0.0.2        2.2.2.2        

第七步  在R1上运行traceroute测试
R1#traceroute
Protocol [ip]:
Target IP address: 5.5.5.5
Source address: 1.1.1.1
Numeric display [n]:
Timeout in seconds [3]:
Probe count [3]:
Minimum Time to Live [1]:
Maximum Time to Live [30]:
Port Number [33434]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Type escape sequence to abort.
Tracing the route to 5.5.5.5
  1 12.0.0.2 [MPLS: Label 204 Exp 0] 300 msec 232 msec 112 msec
  2 23.0.0.3 [MPLS: Label 303 Exp 0] 176 msec 132 msec 196 msec
  3 34.0.0.4 [MPLS: Label 403 Exp 0] 184 msec 160 msec 156 msec
  4 45.0.0.5 160 msec *  228 msec

第八步  检查5.5.5.5的标签分配
R1#show mpls ldp binding 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 12
        local binding:  tag: 104
        remote binding: tsr: 2.2.2.2:0, tag: 204
R2#show mpls ldp binding 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 12
        local binding:  tag: 204
        remote binding: tsr: 1.1.1.1:0, tag: 104
        remote binding: tsr: 3.3.3.3:0, tag: 303
R3#show mpls ldp binding 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 12
        local binding:  tag: 303
        remote binding: tsr: 2.2.2.2:0, tag: 204
        remote binding: tsr: 4.4.4.4:0, tag: 403
R4#show mpls ldp binding 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 12
        local binding:  tag: 403
        remote binding: tsr: 3.3.3.3:0, tag: 303
R5#show mpls ldp binding 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 20
        remote binding: tsr: 4.4.4.4:0, tag: 403
第九步  检查5.5.5.5的MPLS转发表
R1#show mpls forwarding-table 5.5.5.5
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop   
tag    tag or VC   or Tunnel Id      switched   interface             
104    204         5.5.5.5/32        0          Se2/1      point2point
R2#show mpls forwarding-table 5.5.5.5
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop   
tag    tag or VC   or Tunnel Id      switched   interface             
204    303         5.5.5.5/32        324        Se2/2      point2point
R3#show mpls forwarding-table 5.5.5.5
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop   
tag    tag or VC   or Tunnel Id      switched   interface             
303    403         5.5.5.5/32        744        Se2/2      point2point
R4#show mpls forwarding-table 5.5.5.5
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop   
tag    tag or VC   or Tunnel Id      switched   interface             
403    Untagged    5.5.5.5/32        1128       Se2/2      point2point 
//  倒数第二跳弹出
R5#show mpls forwarding-table 5.5.5.5
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop   
tag    tag or VC   or Tunnel Id      switched   interface