拓扑是：CE1-PE1-ASBR1-ASBR2-PE2-CE2
    编号为1的是AS100内的，编号为2的是AS200内的。
    现在是路由正常CE1和CE2分别可以收到对端的路由。
    但是mpls的数据流向有问题，从CE1发出去往CE2的数据包没有压VPN标签，而是直接走的普通IP包。
    各位高人麻烦谁能给我解释一下。
    ASBR1的mpls for:
    Rack1R3#sh mpls for
    Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
    tag    tag or VC   or Tunnel Id      switched   interface
    300    Pop tag     2.2.2.0/24        0          Se1/0.1    point2point
    301    Pop tag     34.1.1.4/32       0          Se1/0.2    point2point
    304    409         1:2:6.6.6.0/24    0          Se1/0.2    point2point
    305    408         1:2:56.1.1.0/24   0          Se1/0.2    point2point
    ASBR2的mpls for:
    Rack1R4#sh mpls for
    Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
    tag    tag or VC   or Tunnel Id      switched   interface
    400    Pop tag     5.5.5.0/24        0          Se1/0.2    point2point
    401    Pop tag     34.1.1.3/32       0          Se1/0.1    point2point
    402    303         1:1:1.1.1.1/32    0          Se1/0.1    point2point
    403    302         1:1:12.1.1.0/24   0          Se1/0.1    point2point
    PE1的配置：
    version 12.4
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname Rack1R2
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    memory-size iomem 5
    ip cef
    !
    ip vrf a
    rd 1:1
    route-target export 1:12
    route-target import 1:12
    !
    no ip domain lookup
    ip auth-proxy max-nodata-conns 3
    ip admission max-nodata-conns 3
    !
    mpls label range 200 299
    multilink bundle-name authenticated
    !
    archive
    log config
    hidekeys
    !
    interface Loopback0
    ip address 2.2.2.2 255.255.255.0
    !
    interface Serial1/0
    no ip address
    encapsulation frame-relay
    serial restart-delay 0
    !
    interface Serial1/0.1 point-to-point
    ip vrf forwarding a
    ip address 12.1.1.2 255.255.255.0
    snmp trap link-status
    frame-relay interface-dlci 201
    !
    interface Serial1/0.2 point-to-point
    ip address 23.1.1.2 255.255.255.0
    snmp trap link-status
    mpls ip
    frame-relay interface-dlci 203
    !
    router eigrp 100
    network 2.2.2.0 0.0.0.255
    network 23.1.1.0 0.0.0.255
    no auto-summary
    !
    router ospf 1 vrf a
    router-id 2.2.2.2
    log-adjacency-changes
    redistribute bgp 100 subnets
    network 12.1.1.2 0.0.0.0 area 0
    !
    router bgp 100
    bgp router-id 1.1.1.1
    no bgp default ipv4-unicast
    bgp log-neighbor-changes
    neighbor 3.3.3.3 remote-as 100
    neighbor 3.3.3.3 update-source Loopback0
    !
    address-family vpnv4
    neighbor 3.3.3.3 activate
    neighbor 3.3.3.3 send-community extended
    exit-address-family
    !
    address-family ipv4 vrf a
    redistribute ospf 1 vrf a match internal external 1 external 2
    no synchronization
    exit-address-family
    !
    ip forward-protocol nd
    !
    !mpls ldp router-id Loopback0
    !
    control-plane

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