MPLS LDP 邻居的建立和IGP（eigrp，ospf）的邻居建立一样也是直连才可以建立邻居，

R01#show mpls ldp neighbor
    Peer LDP Ident: 123.4.4.4:0; Local LDP Ident 123.1.1.1:0
        TCP connection: 123.4.4.4.32366 - 123.1.1.1.646
        State: Oper; Msgs sent/rcvd: 260/260; Downstream
        Up time: 03:32:04
        LDP discovery sources:
          Ethernet0/2, Src IP addr: 123.10.1.1
        Addresses bound to peer LDP Ident:
          123.10.1.18     123.4.4.4       123.10.1.1      123.10.1.21
    Peer LDP Ident: 123.5.5.5:0; Local LDP Ident 123.1.1.1:0
        TCP connection: 123.5.5.5.27762 - 123.1.1.1.646
        State: Oper; Msgs sent/rcvd: 257/258; Downstream
        Up time: 03:31:53
        LDP discovery sources:
          Ethernet0/1, Src IP addr: 123.10.1.6
        Addresses bound to peer LDP Ident:
          123.10.1.14     123.5.5.5       123.10.1.6      123.10.1.29
R01#
R01#

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R02#show mpls ldp neighbor
    Peer LDP Ident: 123.4.4.4:0; Local LDP Ident 123.2.2.2:0
        TCP connection: 123.4.4.4.46777 - 123.2.2.2.646
        State: Oper; Msgs sent/rcvd: 266/263; Downstream
        Up time: 03:35:19
        LDP discovery sources:
          Ethernet0/2, Src IP addr: 123.10.1.18
        Addresses bound to peer LDP Ident:
          123.10.1.18     123.4.4.4       123.10.1.1      123.10.1.21
    Peer LDP Ident: 123.3.3.3:0; Local LDP Ident 123.2.2.2:0
        TCP connection: 123.3.3.3.22712 - 123.2.2.2.646
        State: Oper; Msgs sent/rcvd: 262/262; Downstream
        Up time: 03:35:12
        LDP discovery sources:
          Ethernet0/1, Src IP addr: 123.10.1.10
        Addresses bound to peer LDP Ident:
          123.10.1.10     123.3.3.3       123.10.1.13
R02#
R02#

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R04#show mpls ldp nei
R04#show mpls ldp neighbor
    Peer LDP Ident: 123.1.1.1:0; Local LDP Ident 123.4.4.4:0
        TCP connection: 123.1.1.1.646 - 123.4.4.4.32366
        State: Oper; Msgs sent/rcvd: 264/264; Downstream
        Up time: 03:35:58
        LDP discovery sources:
          Ethernet0/1, Src IP addr: 123.10.1.2
        Addresses bound to peer LDP Ident:
          123.10.1.5      123.1.1.1       123.10.1.2
    Peer LDP Ident: 123.2.2.2:0; Local LDP Ident 123.4.4.4:0
        TCP connection: 123.2.2.2.646 - 123.4.4.4.46777
        State: Oper; Msgs sent/rcvd: 264/267; Downstream
        Up time: 03:35:48
        LDP discovery sources:
          Ethernet0/0, Src IP addr: 123.10.1.17
        Addresses bound to peer LDP Ident:
          123.10.1.9      123.2.2.2       123.10.1.17
    Peer LDP Ident: 123.6.6.6:0; Local LDP Ident 123.4.4.4:0
        TCP connection: 123.6.6.6.62324 - 123.4.4.4.646
        State: Oper; Msgs sent/rcvd: 262/266; Downstream
        Up time: 03:35:41
        LDP discovery sources:
          Ethernet0/2, Src IP addr: 123.10.1.22
        Addresses bound to peer LDP Ident:
          123.10.1.25     123.6.6.6       123.10.1.22
R04#
R04#
R04#