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在IP Only Customer Carrier和MPLS Enabled Customer Carrier中，并不是真正意义的层次化MPLS VPN结构，接下来我就说说层次化的VPN结构，在这个模型中Carrier网络给客户提供的是MPLS VPN接入，也就是说两个Carrier通过一级运营商的MPLS VPN连接起来后，他们又提供MPLS VPN接入。和前面两个模型不同的地方如下：

1、R6和R3为客户创建VRF vpna RD 1:1 RT 1:1
2、将连接客户的接口划到VRF中
3、在Carrier的两台路由器上R1与R3，R5与R6上启用MP-BGP，将路由相互发到VPN中
4、在R1与R5上分别配置MP-BGP的RR,将R3与R6作为VPN的客户端。

详细MPLS Lable表如下：

Rack1R3#traceroute vrf vpna 6.6.6.6

Type escape sequence to abort.
Tracing the route to 6.6.6.6

  1 150.1.13.1 [MPLS: Labels 101/606 Exp 0] 812 msec 788 msec 1240 msec
  2 150.1.12.2 [MPLS: Labels 202/606 Exp 0] 928 msec 1008 msec 600 msec
  3 150.1.45.4 [MPLS: Labels 408/606 Exp 0] 584 msec 528 msec 896 msec
  4 150.1.45.5 [MPLS: Labels 504/606 Exp 0] 992 msec 508 msec 492 msec
  5 6.6.6.6 780 msec 1432 msec 1156 msec
Rack1R3#

Rack1R3#show mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
300    101         150.1.6.6/32      0          Se1/2      point2point  
301    103         150.1.5.5/32      0          Se1/2      point2point  
302    Pop tag     150.1.1.1/32      0          Se1/2      point2point  
303    Pop tag     150.1.12.0/24     0          Se1/2      point2point  
304    102         150.1.56.0/24     0          Se1/2      point2point  
305    104         150.1.45.0/24     0          Se1/2      point2point  
306    Aggregate   3.3.3.3/32[V]     5104                              
Rack1R3#

Rack1R1#show mpls forwarding-table
Local  Outgoing      Prefix            Bytes Label   Outgoing   Next Hop    
Label  Label or VC   or Tunnel Id      Switched      interface              
100    Pop Label     150.1.3.3/32      2352          Se2/1      point2point
101    202           150.1.6.6/32      4256          Se2/0      150.1.12.2  
102    200           150.1.56.0/24     0             Se2/0      150.1.12.2  
103    203           150.1.5.5/32      0             Se2/0      150.1.12.2  
104    201           150.1.45.0/24     0             Se2/0      150.1.12.2  
Rack1R1#

Rack1R2#show mpls forwarding-table
Local  Outgoing      Prefix            Bytes Label   Outgoing   Next Hop    
Label  Label or VC   or Tunnel Id      Switched      interface              
200    407           150.1.56.0/24[V]  0             Fa0/0      150.1.24.4  
201    401           150.1.45.0/24[V]  0             Fa0/0      150.1.24.4  
202    408           150.1.6.6/32[V]   9414          Fa0/0      150.1.24.4  
203    406           150.1.5.5/32[V]   14167         Fa0/0      150.1.24.4  
204    Pop Label     150.1.4.4/32      0             Fa0/0      150.1.24.4  
205    Aggregate     150.1.12.0/24[V]  0             AS1                    
206    100           150.1.3.3/32[V]   13880         Se2/0      150.1.12.1  
208    Pop Label     150.1.1.1/32[V]   11135         Se2/0      150.1.12.1  
214    Pop Label     150.1.13.0/24[V]  0             Se2/0      150.1.12.1  
Rack1R2#

Rack1R4#show mpls for
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
400    Pop tag     150.1.2.2/32      0          Et0/0      150.1.24.2  
401    Aggregate   150.1.45.0/24[V]  0                                  
403    205         150.1.12.0/24[V]  0          Et0/0      150.1.24.2  
405    208         150.1.1.1/32[V]   13889      Et0/0      150.1.24.2  
406    Pop tag     150.1.5.5/32[V]   14618      Se1/0.1    point2point  
407    Pop tag     150.1.56.0/24[V]  0          Se1/0.1    point2point  
408    504         150.1.6.6/32[V]   13736      Se1/0.1    point2point  
409    206         150.1.3.3/32[V]   14082      Et0/0      150.1.24.2  
410    214         150.1.13.0/24[V]  0          Et0/0      150.1.24.2  
Rack1R4#

Rack1R5#show mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
500    405         150.1.1.1/32      0          Se1/0.1    point2point  
501    409         150.1.3.3/32      5384       Se1/0.1    point2point  
502    403         150.1.12.0/24     0          Se1/0.1    point2point  
503    410         150.1.13.0/24     0          Se1/0.1    point2point  
504    Pop tag     150.1.6.6/32      4286       Et0/0      150.1.56.6  
Rack1R5#

Rack1R6#show mpls for
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
600    Pop tag     150.1.5.5/32      0          Et0/0      150.1.56.5  
601    501         150.1.3.3/32      0          Et0/0      150.1.56.5  
602    500         150.1.1.1/32      0          Et0/0      150.1.56.5  
603    503         150.1.13.0/24     0          Et0/0      150.1.56.5  
604    502         150.1.12.0/24     0          Et0/0      150.1.56.5  
605    Pop tag     150.1.45.0/24     0          Et0/0      150.1.56.5  
606    Aggregate   6.6.6.6/32[V]     4744                              
Rack1R6#

Rack1R6#traceroute vrf vpna 3.3.3.3

Type escape sequence to abort.
Tracing the route to 3.3.3.3

  1 150.1.56.5 [MPLS: Labels 501/306 Exp 0] 528 msec 828 msec 984 msec
  2 150.1.24.4 [MPLS: Labels 409/306 Exp 0] 2060 msec 1032 msec 920 msec
  3 150.1.12.2 [MPLS: Labels 206/306 Exp 0] 848 msec 1004 msec 928 msec
  4 150.1.12.1 [MPLS: Labels 100/306 Exp 0] 664 msec 544 msec 604 msec
  5 3.3.3.3 1092 msec 1224 msec 384 msec
Rack1R6#

作者：Tony Liu(admin#myccie.net)
地址：http://myccie.net/read.php?104
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