拓扑：
配置：
---------------PE1------------------------
mpls label range 200 299
mpls label protocol ldp
mpls ldp router-id Loopback0
interface Loopback0
ip address 192.168.1.1 255.255.255.255
no shut
!
interface FastEthernet0/1
ip address 23.1.1.2 255.255.255.0
no shut
mpls ip
!
!
router ospf 100
router-id 2.2.2.2
log-adjacency-changes
network 23.1.1.0 0.0.0.255 area 0
network 192.168.1.1 0.0.0.0 area 0
---------------------P----------------------
mpls label range 300 399
mpls label protocol ldp
mpls ldp router-id Loopback0
!
interface Loopback0
ip address 192.168.1.2 255.255.255.255
no shut
interface FastEthernet0/0
ip address 34.1.1.3 255.255.255.0
no shut
mpls ip
!
interface FastEthernet0/1
ip address 23.1.1.3 255.255.255.0
no shut
mpls ip
!
!
router ospf 100
router-id 3.3.3.3
log-adjacency-changes
network 23.1.1.0 0.0.0.255 area 0
network 34.1.1.0 0.0.0.255 area 0
network 192.168.1.2 0.0.0.0 area 0
-----------------PE2---------------------
mpls label range 400 499
mpls label protocol ldp
mpls ldp router-id Loopback0
!
interface Loopback0
ip address 192.168.1.3 255.255.255.255
no shut
interface FastEthernet0/0
ip address 34.1.1.4 255.255.255.0
mpls ip
no shut
router ospf 100
router-id 4.4.4.4
log-adjacency-changes
network 34.1.1.0 0.0.0.255 area 0
network 192.168.1.3 0.0.0.0 area 0
------------------CE1-----------------------
interface FastEthernet0/0.100
encapsulation dot1Q 100
ip address 192.168.100.100 255.255.255.0
------------------CE2------------------
interface FastEthernet0/1.100
encapsulation dot1Q 100
ip address 192.168.100.105 255.255.255.0
验证基本联通性：
（1）验证路由
（2）验证启用了MPLS的接口是否可以
（3）验证P路由器已经发现PE路由器
（4）验证邻居
配置端口透传
（PE1）F0/0接口
（PE2）F0/1接口
说明：ip地址是对端回环口IP地址，伪线封装MPLS.
验证透传：
（1）VC状态
（2）标签转发表
（3）连通性
