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1、Mpls vpn跨域optionB2011-09-23 13:45:49|分类： MPLS-VPN |标签：mplsvpn跨域optionb |字号大中小订阅 Mpls vpn跨域optionB有两种方式：第一种方式为ASBR之间通过单跳MP-EBGP，ASBR之间必须直联第二种方式为ASBR之间通过多跳MP-EBGP，ASBR之间必须采用tunnel方式，本文只介绍这种方式。Mpls vpn over gre！对于mpls vpn over gre的这种方式，有两种方法可以使VPNv4的下一跳地址在接收路由更新的AS中可达：1 将ASBR之间的tunnel互联地址重分布到IGP；2 ASBR
2、在向PE或RR传递从另一个AS学到的VPNv4的路由时，下一跳为自已，也就是next-hop-self实验拓扑图如下：方法一：默认情况下，R6从AS1学到VPNv4的路由再通告给R10RR时，下一跳地址为R4的F0/0的地址，但是R10学到VPNv4路由的下一跳地址不可达，所以在R4和R6上分别将tunnel的互联地址重新分发到IGP中，这样R10才通将VPNv4的路由传递给R9。在标签交换方面，下一跳地址不改变，就不会重新分配标签。如R9学到的VPNv4的路由分配out标签是由R4分配的。0 packets, 0 bytes tag information set, all rewrites
3、 owned local tag: VPN route head fast tag rewrite with Fa0/0, 192.168.2.9, tags imposed 840 427 via 192.168.0.5, 0 dependencies, recursive next hop 192.168.2.9, FastEthernet0/0 via 192.168.0.5/32 (Default) valid cached adjacencytag rewrite with Fa0/0, 192.168.2.9, tags imposed 840 427Type escape seq
4、uence to abort. 1 10.0.0.1 60 msec 140 msec 168 msec 2 192.168.1.2 MPLS: Labels 232/643 Exp 0 1008 msec 1028 msec 936 msec 3 192.168.1.6 MPLS: Labels 332/643 Exp 0 840 msec 1004 msec 816 msec 4 192.168.1.10 MPLS: Labels 426/643 Exp 0 888 msec 836 msec 768 msec 5 192.168.0.6 MPLS: Label 643 Exp 0 768
5、 msec 812 msec 1176 msec /只有单层标签 6 192.168.2.2 MPLS: Labels 717/939 Exp 0 888 msec 932 msec 936 msec 7 192.168.2.6 MPLS: Labels 813/939 Exp 0 792 msec 740 msec 816 msec 8 10.0.0.5 AS 20 MPLS: Label 939 Exp 0 796 msec 688 msec 984 msec 9 10.0.0.6 AS 20 1032 msec 884 msec 984 msecR11#R4和R6上只保存本AS内的VPN
6、v4的路由。R4#show mpls forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 416 Untagged 6.6.6.6/32 0 Fa0/0 192.168.0.2 417 110 1:1:10.0.0.0/30 610 Fa1/1 192.168.1.9 418 Pop tag 192.168.1.16/30 0 Fa1/1 192.168.1.9 419 Pop tag 192.168.1.4/30 0 F
7、a1/1 192.168.1.9 420 303 192.168.1.12/30 0 Fa1/1 192.168.1.9 421 300 192.168.1.0/30 0 Fa1/1 192.168.1.9 422 301 1.1.1.1/32 15844 Fa1/1 192.168.1.9 423 302 2.2.2.2/32 0 Fa1/1 192.168.1.9 424 Pop tag 3.3.3.3/32 0 Fa1/1 192.168.1.9 425 328 5.5.5.5/32 3573 Fa1/1 192.168.1.9 426 Pop tag 192.168.0.6/32 64
8、0 Tu0 point2point 427 138 1:1:11.11.11.11/32 5068 Fa1/1 192.168.1.9 428 137 1:1:192.168.10.0/24 0 Fa1/1 192.168.1.9 R6#show mpls forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 608 Untagged 4.4.4.4/32 0 Fa0/0 192.168.0.1 609 Pop tag 19
9、2.168.0.1/32 0 Fa0/0 192.168.0.1 610 Pop tag 192.168.2.12/30 0 Fa1/0 192.168.2.2 611 Pop tag 192.168.2.4/30 0 Fa1/0 192.168.2.2 612 714 192.168.2.16/30 0 Fa1/0 192.168.2.2 613 716 192.168.2.8/30 0 Fa1/0 192.168.2.2 614 Pop tag 7.7.7.7/32 0 Fa1/0 192.168.2.2 615 715 8.8.8.8/32 0 Fa1/0 192.168.2.2 640
10、 717 9.9.9.9/32 0 Fa1/0 192.168.2.2 641 713 10.10.10.10/32 1216 Fa1/0 192.168.2.2 642 Pop tag 192.168.0.5/32 640 Tu0 point2point 643 939 1:1:12.12.12.12/32 610 Fa1/0 192.168.2.2 644 938 1:1:192.168.20.0/24 0 Fa1/0 192.168.2.2 R4的配置：hostname R4!boot-start-markerboot-end-marker!ip subnet-zero!ip cefno
11、 ip domain-lookupmpls label range 400 499mpls label protocol ldp! interface Loopback0no ip directed-broadcast!interface Tunnel0no ip directed-broadcastmpls bgp forwardingtunnel source Loopback0!interface FastEthernet0/0no ip directed-broadcastmpls bgp forwarding!interface FastEthernet1/0no ip addres
12、sno ip directed-broadcastshutdownduplex halfspeed auto! interface FastEthernet1/1no ip directed-broadcastduplex halfspeed autotag-switching ip!router ospf 1log-adjacency-changesredistribute connected subnetsnetwork 4.4.4.4 0.0.0.0 area 0network 192.168.1.8 0.0.0.3 area 0!router bgp 1no bgp default r
13、oute-target filterbgp log-neighbor-changesneighbor 5.5.5.5 remote-as 1neighbor 5.5.5.5 update-source Loopback0neighbor 192.168.0.6 remote-as 2!address-family ipv4neighbor 5.5.5.5 activateno neighbor 192.168.0.6 activateno auto-summaryno synchronizationexit-address-family!address-family vpnv4neighbor
14、 5.5.5.5 activateneighbor 5.5.5.5 send-munity bothneighbor 192.168.0.6 activateneighbor 192.168.0.6 send-munity bothexit-address-family!ip classless!control-plane!line con 0exec-timeout 0 0stopbits 1line aux 0stopbits 1line vty 0 4login!no s aaa enableR6的配置：hostname R6!boot-start-markerboot-end-mark
15、er!ip subnet-zero!ip cefno ip domain-lookupmpls label range 600 699mpls label protocol ldp! interface Loopback0no ip directed-broadcast!interface Tunnel0no ip directed-broadcastmpls bgp forwardingtunnel source Loopback0!interface FastEthernet0/0no ip directed-broadcastmpls bgp forwarding!interface F
16、astEthernet1/0no ip directed-broadcastduplex halfspeed autotag-switching ip! interface FastEthernet1/1no ip addressno ip directed-broadcastshutdownduplex halfspeed auto!router odr!router ospf 1log-adjacency-changesredistribute connected subnetsnetwork 6.6.6.6 0.0.0.0 area 0network 192.168.2.0 0.0.0.
17、3 area 0!router bgp 2no synchronizationno bgp default route-target filterbgp log-neighbor-changesneighbor 10.10.10.10 remote-as 2neighbor 10.10.10.10 update-source Loopback0neighbor 192.168.0.5 remote-as 1no auto-summary!address-family vpnv4neighbor 10.10.10.10 activateneighbor 10.10.10.10 send-muni
18、ty bothneighbor 192.168.0.5 activateneighbor 192.168.0.5 send-munity bothexit-address-family!ip classless!tag-switching tdp router-id Loopback0control-plane!line con 0exec-timeout 0 0stopbits 1line aux 0stopbits 1line vty 0 4login!no s aaa enableend第二种方法：采用next-host-self这时ASBR上同时保存另一个AS的VPN路由，标签也由AS
19、BR分配0 packets, 0 bytes tag information set, all rewrites owned local tag: VPN route head fast tag rewrite with Fa0/0, 192.168.2.9, tags imposed 810 645 via 6.6.6.6, 0 dependencies, recursive next hop 192.168.2.9, FastEthernet0/0 via 6.6.6.6/32 (Default) valid cached adjacency tag rewrite with Fa0/0,
20、 192.168.2.9, tags imposed 810 645R6#show mpls forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 608 Untagged 4.4.4.4/32 0 Fa0/0 192.168.0.1 609 Pop tag 192.168.0.1/32 0 Fa0/0 192.168.0.1 610 Pop tag 192.168.2.12/30 0 Fa1/0 192.168.2.2 6
21、11 Pop tag 192.168.2.4/30 0 Fa1/0 192.168.2.2 612 714 192.168.2.16/30 0 Fa1/0 192.168.2.2 613 716 192.168.2.8/30 0 Fa1/0 192.168.2.2 614 Pop tag 7.7.7.7/32 0 Fa1/0 192.168.2.2 615 715 8.8.8.8/32 0 Fa1/0 192.168.2.2 640 717 9.9.9.9/32 0 Fa1/0 192.168.2.2 641 713 10.10.10.10/32 0 Fa1/0 192.168.2.2 642
22、 Pop tag 192.168.0.5/32 5068 Tu0 point2point 643 939 1:1:12.12.12.12/32 2956 Fa1/0 192.168.2.2 644 938 1:1:192.168.20.0/24 0 Fa1/0 192.168.2.2 645 427 1:1:11.11.11.11/32 0 Tu0 point2point 646 428 1:1:192.168.10.0/24 0 Tu0 point2point 647 417 1:1:10.0.0.0/30 0 Tu0 point2point R4#show mpls forwarding-
23、table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 416 Untagged 6.6.6.6/32 0 Fa0/0 192.168.0.2 417 110 1:1:10.0.0.0/30 4894 Fa1/1 192.168.1.9 418 Pop tag 192.168.1.16/30 0 Fa1/1 192.168.1.9 419 Pop tag 192.168.1.4/30 0 Fa1/1 192.168.1.9 420 303 192.
24、168.1.12/30 0 Fa1/1 192.168.1.9 421 300 192.168.1.0/30 0 Fa1/1 192.168.1.9 422 301 1.1.1.1/32 15844 Fa1/1 192.168.1.9 423 302 2.2.2.2/32 0 Fa1/1 192.168.1.9 424 Pop tag 3.3.3.3/32 0 Fa1/1 192.168.1.9 425 328 5.5.5.5/32 3573 Fa1/1 192.168.1.9 426 Pop tag 192.168.0.6/32 2680 Tu0 point2point 427 138 1:
25、1:11.11.11.11/32 5068 Fa1/1 192.168.1.9 428 137 1:1:192.168.10.0/24 0 Fa1/1 192.168.1.9 429 644 1:1:192.168.20.0/24 0 Tu0 point2point 448 643 1:1:12.12.12.12/32 0 Tu0 point2point 449 609 1:1:10.0.0.4/30 0 Tu0 point2point Type escape sequence to abort. 1 10.0.0.1 112 msec 88 msec 100 msec 2 192.168.1
26、.2 MPLS: Labels 205/448 Exp 0 912 msec 884 msec 936 msec 3 192.168.1.6 MPLS: Labels 329/448 Exp 0 984 msec 1008 msec 884 msec 4 192.168.1.10 MPLS: Label 448 Exp 0 936 msec 812 msec 888 msec 5 192.168.0.6 MPLS: Label 643 Exp 0 840 msec 764 msec 860 msec /标签由448变成643 6 192.168.2.2 MPLS: Labels 717/939
27、 Exp 0 912 msec 764 msec 1080 msec 7 192.168.2.6 MPLS: Labels 813/939 Exp 0 1008 msec 884 msec 864 msec 8 10.0.0.5 AS 20 MPLS: Label 939 Exp 0 744 msec 764 msec 792 msec 9 10.0.0.6 AS 20 864 msec 812 msec 888 msecR4的配置router ospf 1log-adjacency-changesnetwork 4.4.4.4 0.0.0.0 area 0network 192.168.1.
28、8 0.0.0.3 area 0!router bgp 1no bgp default route-target filterbgp log-neighbor-changesneighbor 5.5.5.5 remote-as 1neighbor 5.5.5.5 update-source Loopback0neighbor 192.168.0.6 remote-as 2!address-family ipv4neighbor 5.5.5.5 activateno neighbor 192.168.0.6 activateno auto-summaryno synchronizationexi
29、t-address-family!address-family vpnv4neighbor 5.5.5.5 activateneighbor 5.5.5.5 send-munity bothneighbor 5.5.5.5 next-hop-selfneighbor 192.168.0.6 activateneighbor 192.168.0.6 send-munity bothexit-address-family!R6的配置router ospf 1log-adjacency-changesnetwork 6.6.6.6 0.0.0.0 area 0network 192.168.2.0
30、0.0.0.3 area 0!router bgp 2no synchronizationno bgp default route-target filterbgp log-neighbor-changesneighbor 10.10.10.10 remote-as 2neighbor 10.10.10.10 update-source Loopback0neighbor 192.168.0.5 remote-as 1no auto-summary! address-family vpnv4neighbor 10.10.10.10 activateneighbor 10.10.10.10 send-munity bothneighbor 10.10.10.10 next-hop-selfneighbor 192.168.0.5 activateneighbor 192.168.0.5 send-munity bothexit-address-family!
