Mplsvpn跨域optionB有两种方式

1、Mpls vpn跨域optioiiB有两种方式：第一种方式为ASBR之间通过单跳MP-EEGP, ASBR之间必须直联第二种方式为ASBR之间通过多跳MP-EEGP, 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ASER之间的tunnel互联地址重分布到IGP；(2) ASBR在向PE (或RR)传递从另一个AS学到的VPNv4的路由时，卞一跳为自已, 也就是 next-hop-self实验拓扑图如下：方法一: 默认

2、情况下，R6从AS1学到VPNv4的路由再通告给RIO (RR)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 tumiel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。R9# show ip cef vrf test 11.11.11.1111.11.11.11/32, version 34, epoch 0, cached adjacency 192.168.2.90 packets,

3、 0 bytestag uifonnation set, all rewrites ownedlocal tag: VPN route headfast tag rewrite with FaO/O, 192.168.2.9, tags uuposed 840 427via 192.168.0.5, 0 dependencies, recursivenext hop 192.168.2.9. FastEthenietO/O via 192.168.0.5/32 (Default)valid cached adjacencytag rewrite with Fa0/0, 192.16829, t

4、ags imposed 840 427R1 l#traceioute 12.12.12.12Type escape sequence to abort.Tracing the route to 12.12.12.121 10.0.0.1 60 msec 140 msec 168 msec2 192.168.1.2 MPLS: Labels 232/643 Exp 0 1008 msec 1028 msec 936 msec3 192.168.1.6 MPLS: Labels 332/643 Exp 0 840 msec 1004 msec 816 msec4 192.168.1.10 MPLS

5、: Labels 426/643 Exp 0 888 msec 836 msec 768 msec5 192.168.0.6 MPLS: Label 643 Exp 0 768 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 msec7 192.168.2.6 MPLS: Labels 813/939 Exp 0 792 msec 740 msec 816 msec8 10.0.0.5 AS 20 MPLS: Label 939 Exp 0 796 msec

6、 688 msec 984 msec9 10.0.0.6 AS 20 1032 msec 884 msec 984 msecRll#R4和R6上只保存本AS内的VPNv4的路由。R4存show mpls fonvardmg-tableLocalOutgomgPrefixBytes tagOutgomgNext Hoptagtag or VCor Tunnel Idswitchedinterface416Untagged6.6.6.6/320Fa0/0192.168.0.24171101:1:10.0.0.0/30610Fal/1192.168.1.9418Pop tag192.168.1.16

7、/300Fal/1192.168.1.9419Pop tag192.168.1.4/300Fal/1192.168.1.9420303192.168.1.12/300Fal/1192.168.1.9421300192.168.1.0/300Fal/1192.168.1.94223011.1.1.1/3215844Fal/1192.168.1.94233022.2.2.2/320Fal/1192.168.1.9424Pop tag3.3.3.3/320Fal/1192.168.1.94253285.5.5.5/323573Fal/1192.168.1.9426Pop tag192.168.0.6

8、/32640TuOpomt2pomt4271381:1:11.11.11.11/325068Fal/1192.168.1.9428137l:l:192.168J0.0/240Fal/1192.168.L9R6书show mpls fonvardmg-tableLocalOutgomgPrefixBytes tagOutgomgNext Hoptagtag or VCor Tunnel Idswitchedmterface608Untagged4.4.4.4/320Fa0/0192.168.0.1609Pop tag192.168.0.1/320Fa0/0192.168.0.1610Pop ta

9、g192.168.2.12/300Fa 1/0192.168.2.2611Pop tag192.168.2.4/300Fa 1/0192.16&2.2612714192.168.2.16/300Fa 1/0192.168.2.2613716192.168.2.8/300Fa 1/0192.168.2.2614Pop tag7.7.7.7/320Fa 1/0192.168.2.26157158.8.8.8/320Fa 1/0192.168.2.26407179.9.9.9/320Fa 1/0192.168.2.264171310.10.10.10/321216Fa 1/0192.168.2.26

10、42Pop tag192.168.0.5/32640TuOpomt2pomt643939l:l:12.12.12.12/32610Fa 1/0192.168.2.26449381:1:192.168.20.0/240Fa 1/0192.168.2.2R4的配置：hostname R4!boot-stait-marker boot-end-niarker !ip subnet-zero!ip cefno ip domain-lookup mpls label range 400 499 mpls label protocol ldp mteiiace LoopbackOip address 4.

11、4.4.4 255.255.255.255no ip duected-broadcast!mteiiace TumielOip address 192.168.0.5 255.255.255.252no ip duected-broadcastnipls bgp fbnvardmgtuimel source LoopbackOtuimel destination 6.6.6.6!mteiiace FastEthernetO/Oip address 192.168.0.1 255.255.255.252no ip duected-broadcastnipls bgp fonvarduig!mte

12、iiace FastEthernetl/Ono ip addressno ip duected-broadcast shutdownduplex half speed autoimteiiace FastEthernetl/1ip address 192.168.1.10 255.255.255.252 no ip duected-broadcastduplex halfspeed autotag-switclung ipirouter ospf 1log-adjacencv-changesredistribute connected subnetsnetwork 4.4.4.4 0.0.0.

13、0 aiea 0 network 192.168.1.8 0.0.03 area 0irouter bgp 1no bgp default route-target filterbgp logneighbor-changesneighbor 5.5.5.5 remote-as 1neighbor 5.5.5.5 update-source LoopbackO neighbor 192.168.0.6 remote-as 2iaddress-family ipv4 neighbor 5.5.5.5 activateno neighbor 192.168.0.6 activateno auto-s

14、unmiaiyno syncliioiiizationexit-address-fainilyaddress-family vpnv4neighbor 5.5.5.5 activateneighbor 5.5.5.5 send-conununity both neighbor 192.168.0.6 activateneighbor 192.168.0.6 send-coimnunity both exit-address-fainilyip classlessip route 6.6.6.6 255.255.255.255 192.168.0.2contiol-plane lme con 0

15、exec-timeout 0 0 stopbits 1lme aux 0stopbits 1lme vty 0 4login!no cns aaa enableR6的配置：hostname R6!boot-stait-marker boot-end-niarker !ip subnet-zero!ip cefno ip domain-lookup mpls label range 600 699 mpls label protocol ldp mteiiace LoopbackOip address 6.6.6.6 255.255.255.255no ip duected-broadcasti

16、interface TtinnelOip address 192.168.0.6 255.255.255.252 no ip directed-broadcastmpls bgp forwardingtunnel source LoopbackOtunnel destination 4.44.4imteiiace FastEthernetO/Oip address 192.168.0.2 255.255.255.252 no ip duected-broadcastnipls bgp fonvarduig mteiiace FastEthernetl/Oip address 192.168.2

17、.1 255.255.255.252no ip duected-broadcastduplex halfspeed autotag-switclung ip!mteiiace FastEthernetl/1no ip addressno ip duected-broadcastshutdownduplex halfspeed auto!router odr!router ospf 1log-adjacencv-changesredistribute connected subnetsnetwork 6.6.6.6 0.0.0.0 aiea 0network 192.168.2.0 0.0.03

18、 area 0!router bgp 2no syncliioiiizationno bgp default route-target filterbgp log-neighbor-chaiigesneighbor 10.10.10.10 remote-as 2neighbor 10.10.10.10 update-source LoopbackOneighbor 192.168.0.5 remote-as 1no auto-sununaiyiaddress-family vpnv4neighbor 10.10.10.10 activateneighbor 10.10.10.10 send-c

19、oininunity bothneighbor 192.168.0.5 activateneighbor 192.16&0.5 send-community bothexit-address-fainilyip classlessip route 4.4.4.4 255.255.255.255 192.168.0.1tag-switchmg tdp routei-id LoopbackOcontiol-planeiilme con 0exec-timeout 0 0stopbits 1lme aux 0stopbits 1lme vty 0 4loginino cns aaa enableen

20、d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ASBR分配R9# show ip cef vrf test 11.11.11.1111.11.11.11/32, version 37, epoch 0, cached adjacency 192.168.2.90 packets, 0 bytestag mformation set, all rewrites ownedlocal tag: VPN route headfast tag rewrite with FaO/O, 192.168.2.9, tags uuposed 810 645

21、via 6.6.6.6. 0 dependencies, recursivenext hop 192.16&2.9、FastEthenietO/O via 6.6.6.6/32 (Default)valid cached adjacencytag rewrite with Fa0/0, 192.168.2.9, tags imposed 810 645192.168.2.2R6#show mpls fonvardmg-tableLocalOutgomgPrefixBytes tagOutgomgNext Hoptagtag or VCor Tunnel Idswitchedinterface6

22、08Untagged4.4.4.4/320Fa0/0192.168.0.1609Pop tag192.168.0.1/320Fa0/0192.168.0.1610Pop tag192.168.2.12/300Fa 1/0192.168.2.2611Pop tag192.168.2.4/300Fa 1/0192.16&2.2612714192.168.2.16/300Fa 1/0192.168.2.2613716192.168.2.8/300Fa 1/0192.168.2.2614Pop tag7.7.7.7/320Fal/0192.168.2.26157158.8.8.8/320Fa 1/01

23、92.168.2.26407179.9.9.9/320Fal/0192.168.2.264171310.10.10.10/320Fal/0192.168.2.2642Pop tag192.168.0.5/325068TuOpomt2pomt643939l:l:12.12J2.12/322956Fa 1/0644938l:l:192.168.200/240Fa 1/0192.16&2.26454271:1:11.11.11.11/320TuOpoint2point646428l:l:192.168.10s 20864 msec 812 msec 888 msecR4弐劄碗lou ospf 1 logladJaccllcylchaldQcsnctwoik 4444 0.0.0.0 area 0 network 19216818 OOO.3 area 0一lou bgp 1no bgp dcfhulr lou?lslg2bgp logncighborchangcs neighbor 5555【cmotcas 1 neighbor 5555 updaesoECC LoopbackOneighbor 19216806【emoteas 2一addlcss.fhlnily ipv4ne