MPLS-VPN Inter-AS Option C(iBGP send-label)の構成・設定

Dynamips/Dynagenを使用して、MPLS-VPN Inter-AS Option C(iBGP send-label)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ネイバー
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で確認))

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 16 msec 12 msec 16 msec
  2 10.23.0.2 [MPLS: Labels 2002/1006/8005 Exp 0] 208 msec 184 msec 144 msec ---> 3 labels
  3 10.12.0.1 [MPLS: Labels 1006/8005 Exp 0] 144 msec 140 msec 144 msec
  4 10.100.0.6 [MPLS: Labels 6004/8005 Exp 0] 176 msec 148 msec 132 msec
  5 10.67.0.7 [MPLS: Labels 7001/8005 Exp 0] 160 msec 144 msec 144 msec
  6 172.16.89.8 [MPLS: Label 8005 Exp 0] 116 msec 176 msec 144 msec
  7 172.16.89.9 152 msec *  136 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     3005/nolabel
   9.9.9.9/32       8.8.8.8         nolabel/8005     ---> 1st label of 3 labels
   172.16.34.0/24   0.0.0.0         3006/nolabel(V1)
   172.16.40.0/24   172.16.34.4     3007/nolabel
   172.16.89.0/24   8.8.8.8         nolabel/8006
   172.16.90.0/24   8.8.8.8         nolabel/8007

R3#sh bgp ipv4 unicast labels
   Network          Next Hop      In label/Out label
   3.3.3.3/32       1.1.1.1         nolabel/1002
   8.8.8.8/32       1.1.1.1         nolabel/1006     ---> 2nd label of 3 labels
   11.11.11.11/32   1.1.1.1         nolabel/1001
   12.12.12.12/32   1.1.1.1         nolabel/1007

R3#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
3000       2000       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       Pop Label  10.12.0.0/24     0             Fa0/0      10.23.0.2
3003       Pop Label  10.112.0.0/24    0             Fa0/0      10.23.0.2
3004       2002       1.1.1.1/32       0             Fa0/0      10.23.0.2   ---> 3rd label of 3 labels
3005       No Label   4.4.4.4/32[V]    3500          Fa0/1      172.16.34.4
3006       No Label   172.16.34.0/24[V]   \
                                       0             aggregate/V1
3007       No Label   172.16.40.0/24[V]   \
                                       0             Fa0/1      172.16.34.4
3008       No Label   5.5.5.5/32[V]    0             Fa1/0      172.16.35.5
3009       No Label   172.16.35.0/24[V]   \
                                       0             aggregate/V2
3010       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  11.11.11.11/32   3746          Fa1/0      10.112.0.11
2001       Pop Label  3.3.3.3/32       5585          Fa0/1      10.23.0.3
2002       Pop Label  1.1.1.1/32       4315          Fa0/0      10.12.0.1   ---> 3rd label Pop

R1#sh bgp ipv4 unicast labels
   Network          Next Hop      In label/Out label
   3.3.3.3/32       10.12.0.2       1002/nolabel
   8.8.8.8/32       10.100.0.6      1006/6004    ---> 2nd label exchange
   11.11.11.11/32   10.12.0.2       1001/nolabel
   12.12.12.12/32   10.100.0.6      1007/6005

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       2000       11.11.11.11/32   1405          Fa0/1      10.12.0.2
1002       2001       3.3.3.3/32       3676          Fa0/1      10.12.0.2
1003       Pop Label  2.2.2.2/32       0             Fa0/1      10.12.0.2
1004       Pop Label  10.23.0.0/24     0             Fa0/1      10.12.0.2
1005       Pop Label  10.112.0.0/24    0             Fa0/1      10.12.0.2
1006       6004       8.8.8.8/32       2020          Fa0/0      10.100.0.6 ---> 2nd label exchange
1007       6005       12.12.12.12/32   1592          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 and label assign

R4 :
  sh ip route
  ping 9.9.9.9 so lo0
R3 :
  sh bgp vpnv4 unicast all labels
  sh mpls forwarding-table
R2 :
  sh mpls forwarding-table
R1 :
  sh bgp ipv4 unicast labels
R11 :
  sh bgp vpnv4 unicast all

(1)  R4

(2)  R3

(3)  R2

(4)  R1

(5)  R11

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