MPLS-VPN Inter-AS Option C(Multihop VPNv4)の構成・設定

Dynamips/Dynagenを使用して、MPLS-VPN Inter-AS Option C(Multihop VPNv4)を構成します。

Topology

Configuration Settings Overview

MPLSラベル交換
R1-R6間において、eBGP send-label指定によりMPLSラベル情報を交換。
VPNv4設定
R3 - R11(R11はVPNv4 route reflector)
R8 - R12(R12はVPNv4 route reflector)
R11 - R12 :
Next Hopが自分自身とならず、R11の学習経路のNext HopはR8、R12の学習経路のNext HopはR3となるように以下のコマンドを投入。
command : neighbor x.x.x.x next-hop-unchanged
なお、R3及びR8の経路に付随するMPLSラベルはBGP send-labelにより学習する。
MPLS Label Range設定
MPLSラベルの遷移が分かりやすいように、以下のようにMPLSラベルを各ルータにアサインする。
R1 : mpls label range 1000 1999
R2 : mpls label range 2000 2999
R3 : mpls label range 3000 3999
R11 : mpls label range 11000 11999
R7 : mpls label range 7000 7999
R8 : mpls label range 8000 8999
R9 : mpls label range 9000 9999
R12 : mpls label range 12000 12999

show command (抜粋) 詳細は以下のshow commandを参照。

R4#traceroute 9.9.9.9 so lo0 numeric
Type escape sequence to abort.
Tracing the route to 9.9.9.9
VRF info: (vrf in name/id, vrf out name/id)
  1 172.16.34.3 12 msec 16 msec 20 msec
  2 10.23.0.2 [MPLS: Labels 2003/8007 Exp 0] 140 msec 140 msec 140 msec ---> 2 labels
  3 10.12.0.1 [MPLS: Labels 1006/8007 Exp 0] 144 msec 168 msec 156 msec
  4 10.100.0.6 [MPLS: Labels 6001/8007 Exp 0] 144 msec 140 msec 140 msec
  5 10.67.0.7 [MPLS: Labels 7001/8007 Exp 0] 144 msec 136 msec 252 msec
  6 172.16.89.8 [MPLS: Label 8007 Exp 0] 128 msec 112 msec 124 msec
  7 172.16.89.9 148 msec *  132 msec

R3#sh bgp vpnv4 unicast all labels
   Network          Next Hop      In label/Out label
Route Distinguisher: 64512:1 (V1)
   4.4.4.4/32       172.16.34.4     3007/nolabel
   9.9.9.9/32       8.8.8.8         nolabel/8007     ---> 1st label of 2 labels
   172.16.34.0/24   0.0.0.0         3008/nolabel(V1)
   172.16.40.0/24   172.16.34.4     3009/nolabel
   172.16.89.0/24   8.8.8.8         nolabel/8008
   172.16.90.0/24   8.8.8.8         nolabel/8009

R3#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
3000       2001       11.11.11.11/32   0             Fa0/0      10.23.0.2
3001       Pop Label  2.2.2.2/32       0             Fa0/0      10.23.0.2
3002       2000       1.1.1.1/32       0             Fa0/0      10.23.0.2
3003       Pop Label  10.12.0.0/24     0             Fa0/0      10.23.0.2
3004       Pop Label  10.112.0.0/24    0             Fa0/0      10.23.0.2
3005       2003       8.8.8.8/32       0             Fa0/0      10.23.0.2  ---> 2nd label of 2 labels
3006       2004       12.12.12.12/32   0             Fa0/0      10.23.0.2
3007       No Label   4.4.4.4/32[V]    3488          Fa0/1      172.16.34.4
3008       No Label   172.16.34.0/24[V]   \
                                       0             aggregate/V1
3009       No Label   172.16.40.0/24[V]   \
                                       0             Fa0/1      172.16.34.4
3010       No Label   5.5.5.5/32[V]    0             Fa1/0      172.16.35.5
3011       No Label   172.16.35.0/24[V]   \
                                       0             aggregate/V2
3012       No Label   172.16.50.0/24[V]   \
                                       0             Fa1/0      172.16.35.5

R2#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
2000       Pop Label  1.1.1.1/32       5858          Fa0/0      10.12.0.1
2001       Pop Label  11.11.11.11/32   12433         Fa1/0      10.112.0.11
2002       Pop Label  3.3.3.3/32       6808          Fa0/1      10.23.0.3
2003       1006       8.8.8.8/32       1630          Fa0/0      10.12.0.1   ---> 2nd label change
2004       1007       12.12.12.12/32   3882          Fa0/0      10.12.0.1

R1#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
1000       Pop Label  10.100.0.6/32    0             Fa0/0      10.100.0.6
1001       Pop Label  2.2.2.2/32       0             Fa0/1      10.12.0.2
1002       Pop Label  10.112.0.0/24    0             Fa0/1      10.12.0.2
1003       Pop Label  10.23.0.0/24     0             Fa0/1      10.12.0.2
1004       2001       11.11.11.11/32   3731          Fa0/1      10.12.0.2
1005       2002       3.3.3.3/32       3664          Fa0/1      10.12.0.2
1006       6001       8.8.8.8/32       2008          Fa0/0      10.100.0.6  ---> 2nd label change
1007       6005       12.12.12.12/32   3942          Fa0/0      10.100.0.6

Dynagen Config File / Router Config

(0)  Dynagen .net file

(1)  R1

(2)  R2

(3)  R3

(4)  R4

(5)  R5

(6)  R6

(7)  R7

(8)  R8

(9)  R9

(10) R10

(11) R11

(12) R12

show command

R4 :
  sh ip route
  ping 9.9.9.9 so lo0
  traceroute 9.9.9.9 so lo0 numeric
R3 :
  sh bgp vpnv4 unicast all labels
  sh mpls forwarding-table
R2 :
  sh mpls forwarding-table
R1 :
  sh mpls forwarding-table
  sh bgp ipv4 unicast labels

(1)  R4

(2)  R3

(3)  R2

(4)  R1

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