Cisco IOS MPLS TDPの設定方法

2012.05.06
スポンサーリンク

MPLS TDPについてまとめます。殆どの設定はLDPと同じですので、このページにはLDPとTDPの違いのみを記載します。LDPとTDPは似ている部分が多いため、細かな仕様の説明はCisco IOS MPLS LDPの設定方法を参照ください。

TDPはCisco独自仕様であり、2020年時点の最新IOSではマニュアルにはTDPの記載はなくLDPに一本化されていることに留意ください。

TDP

必須設定

LDPではなくTDPを使用するには以下のコマンドを使用します。 

Router(config-if)# mpls label protocol tdp

動作確認

以下の環境でMPLSの動作確認を行います。

なお、以下configに一部”ldp”という言葉がまぎれていますが、全く問題ありません。TDPを使用する場合でも、”mpls ldp router-id”, “mpls ldp password required”などldpという表記の設定を使用します。 

          e0/1    e0/0      e0/0    e0/1      e0/0    e0/1      e0/0    e0/1
          .1+------+.1      .2+------+.2      .3+------+.3      .4+------+
        ----+  R1  +----------+  R2  +----------+  R3  +----------+  R4  +----
            +------+          +------+          +------+          +------+
192.168.1.0/24   192.168.12.0/24   192.168.23.0/24   192.168.34.0/24   192.168.4.0/24

          R1 Loopback0      R2 Loopback0      R3 Loopback0      R4 Loopback0
          10.1.1.1/24       10.2.2.2/24       10.3.3.3/24       10.4.4.4/24

 [R1]
mpls label protocol tdp
!
interface Loopback0
 ip address 10.1.1.1 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.12.1 255.255.255.0
!
interface Ethernet0/1
 ip address 192.168.1.1 255.255.255.0
 no keepalive
!
router ospf 1
 mpls ldp autoconfig
 network 0.0.0.0 255.255.255.255 area 0
!
mpls ldp router-id Loopback0

 [R2]
mpls label protocol tdp
!
interface Loopback0
 ip address 10.2.2.2 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.12.2 255.255.255.0
!
interface Ethernet0/1
 ip address 192.168.23.2 255.255.255.0
 no keepalive
!
router ospf 1
 mpls ldp autoconfig
 network 0.0.0.0 255.255.255.255 area 0
!
mpls ldp router-id Loopback0

 [R3]
mpls label protocol tdp
!
interface Loopback0
 ip address 10.3.3.3 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.23.3 255.255.255.0
!
interface Ethernet0/1
 ip address 192.168.34.3 255.255.255.0
 no keepalive
!
router ospf 1
 mpls ldp autoconfig
 network 0.0.0.0 255.255.255.255 area 0
!
mpls ldp router-id Loopback0

 [R4]
mpls label protocol tdp
!
interface Loopback0
 ip address 10.4.4.4 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.34.4 255.255.255.0
!
interface Ethernet0/1
 ip address 192.168.4.4 255.255.255.0
 no keepalive
!
router ospf 1
 mpls ldp autoconfig
 network 0.0.0.0 255.255.255.255 area 0
!
mpls ldp router-id Loopback0

なお、設定全文は下記ファイルです。ルーティング等の設定は省略しますので、必要に応じて下記を参照下さい。

R1
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
mpls label protocol tdp
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
 ip address 10.1.1.1 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.12.1 255.255.255.0
 half-duplex
!
interface Ethernet0/1
 ip address 192.168.1.1 255.255.255.0
 half-duplex
 no keepalive
!
interface Ethernet0/2
 no ip address
 shutdown
 half-duplex
!
interface Ethernet0/3
 no ip address
 shutdown
 half-duplex
!
!
router ospf 1
 mpls ldp autoconfig
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
ip http server
ip forward-protocol nd
!
!
!
!
!
mpls ldp router-id Loopback0
!
control-plane
!
!
!
!
mgcp behavior g729-variants static-pt
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
 login
!
!
end
R2
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
mpls label protocol tdp
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
 ip address 10.2.2.2 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.12.2 255.255.255.0
 half-duplex
!
interface Ethernet0/1
 ip address 192.168.23.2 255.255.255.0
 half-duplex
!
interface Ethernet0/2
 no ip address
 shutdown
 half-duplex
!
interface Ethernet0/3
 no ip address
 shutdown
 half-duplex
!
!
router ospf 1
 mpls ldp autoconfig
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
ip http server
ip forward-protocol nd
!
!
!
!
!
mpls ldp router-id Loopback0
!
control-plane
!
!
!
!
mgcp behavior g729-variants static-pt
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
 login
!
!
end
R3
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
mpls label protocol tdp
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
 ip address 10.3.3.3 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.23.3 255.255.255.0
 half-duplex
!
interface Ethernet0/1
 ip address 192.168.34.3 255.255.255.0
 half-duplex
!
interface Ethernet0/2
 no ip address
 shutdown
 half-duplex
!
interface Ethernet0/3
 no ip address
 shutdown
 half-duplex
!
!
router ospf 1
 mpls ldp autoconfig
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
ip http server
ip forward-protocol nd
!
!
!
!
!
mpls ldp router-id Loopback0
!
control-plane
!
!
!
!
mgcp behavior g729-variants static-pt
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
 login
!
!
end
R4
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R4
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
mpls label protocol tdp
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
 ip address 10.4.4.4 255.255.255.0
 ip ospf network point-to-point
!
interface Ethernet0/0
 ip address 192.168.34.4 255.255.255.0
 half-duplex
!
interface Ethernet0/1
 ip address 192.168.4.4 255.255.255.0
 half-duplex
 no keepalive
!
interface Ethernet0/2
 no ip address
 shutdown
 half-duplex
!
interface Ethernet0/3
 no ip address
 shutdown
 half-duplex
!
!
router ospf 1
 mpls ldp autoconfig
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
ip http server
ip forward-protocol nd
!
!
!
!
!
mpls ldp router-id Loopback0
!
control-plane
!
!
!
!
mgcp behavior g729-variants static-pt
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
 login
!
!
end

LIB, forwarding-tableの確認方法はLDPと全く同じです。 

R1#show mpls ldp bindings
  tib entry: 10.1.1.0/24, rev 4
        local binding:  tag: imp-null
        remote binding: tsr: 10.2.2.2:0, tag: 16
  tib entry: 10.2.2.0/24, rev 8
        local binding:  tag: 16
        remote binding: tsr: 10.2.2.2:0, tag: imp-null
  tib entry: 10.3.3.0/24, rev 12
        local binding:  tag: 18
        remote binding: tsr: 10.2.2.2:0, tag: 18
  tib entry: 10.4.4.0/24, rev 16
        local binding:  tag: 20
        remote binding: tsr: 10.2.2.2:0, tag: 20

 <omitted>

R1#show mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Pop tag     10.2.2.0/24       0          Et0/0      192.168.12.2
17     Pop tag     192.168.23.0/24   0          Et0/0      192.168.12.2
18     18          10.3.3.0/24       0          Et0/0      192.168.12.2
19     19          192.168.34.0/24   0          Et0/0      192.168.12.2
20     20          10.4.4.0/24       0          Et0/0      192.168.12.2
21     21          192.168.4.0/24    0          Et0/0      192.168.12.2
R1#

LDP, TDPの違い

パケットの観察

TDP neighborを確立する様子を観察します。udp 711, tcp 711を使用してneighborを確立している事が分かります。また、LDPと異なりbroadcastを用いてneighborを発見している事が分かります。 

No.     Time        Source                Destination           Protocol Info
     92 58.885000   192.168.12.2          255.255.255.255       UDP      Source port: cisco-tdp  Destination port: cisco-tdp
     93 60.775000   192.168.12.1          255.255.255.255       UDP      Source port: cisco-tdp  Destination port: cisco-tdp
     94 61.508000   10.1.1.1              10.2.2.2              TCP      cisco-tdp > 64086 [FIN, PSH, ACK] Seq=1 Ack=17 Win=3916 Len=0
     95 61.561000   10.2.2.2              10.1.1.1              TCP      64086 > cisco-tdp [ACK] Seq=17 Ack=2 Win=3932 Len=0
     96 61.569000   10.2.2.2              10.1.1.1              TCP      64086 > cisco-tdp [FIN, PSH, ACK] Seq=17 Ack=2 Win=3932 Len=0
     97 61.635000   10.1.1.1              10.2.2.2              TCP      cisco-tdp > 64086 [ACK] Seq=2 Ack=18 Win=3916 Len=0
     98 63.130000   192.168.12.2          255.255.255.255       UDP      Source port: cisco-tdp  Destination port: cisco-tdp
    100 65.416000   192.168.12.1          255.255.255.255       UDP      Source port: cisco-tdp  Destination port: cisco-tdp
    101 65.504000   10.2.2.2              10.1.1.1              TCP      16134 > cisco-tdp [SYN] Seq=0 Win=4128 Len=0 MSS=536
    102 65.561000   10.1.1.1              10.2.2.2              TCP      cisco-tdp > 16134 [SYN, ACK] Seq=0 Ack=1 Win=4128 Len=0 MSS=536
    103 65.593000   10.2.2.2              10.1.1.1              TCP      16134 > cisco-tdp [ACK] Seq=1 Ack=1 Win=4128 Len=0
    104 65.596000   10.2.2.2              10.1.1.1              TCP      16134 > cisco-tdp [ACK] Seq=1 Ack=1 Win=4128 Len=20
    105 65.620000   10.1.1.1              10.2.2.2              STUN     Message: Binding Request
    106 65.626000   10.2.2.2              10.1.1.1              TCP      16134 > cisco-tdp [ACK] Seq=21 Ack=37 Win=4092 Len=0
    107 65.721000   10.2.2.2              10.1.1.1              TCP      16134 > cisco-tdp [ACK] Seq=21 Ack=37 Win=4092 Len=160
    108 65.795000   10.1.1.1              10.2.2.2              TCP      cisco-tdp > 16134 [ACK] Seq=37 Ack=181 Win=3948 Len=0
    110 65.890000   10.1.1.1              10.2.2.2              TCP      cisco-tdp > 16134 [ACK] Seq=37 Ack=181 Win=3948 Len=144
    111 65.903000   10.2.2.2              10.1.1.1              TCP      16134 > cisco-tdp [ACK] Seq=181 Ack=181 Win=3948 Len=0

LDP, TDPの違い

LDP, TDPの違いをまとめると以下の通りです。

項目 LDP TDP
standard IETF標準 Cisco標準
neighborの発見 udp 646 multicast(224.0.0.2)送信 udp 711 broadcast送信
labelの交換 tcp 646 unicast送信 tcp 711 unicast送信
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