Mpls vpn跨域optionB 第二种方式.docx

Mpls vpn跨域optionB 第二种方式.docx

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Mplsvpn跨域optionB第二种方式

Mplsvpn跨域optionB

2011-09-2313:

45:

49|  分类：

MPLS-VPN|  标签：

mpls  vpn跨域optionb  |字号大中小 订阅

Mplsvpn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。

Mplsvpnovergre！

对于mplsvpnovergre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：

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方法一：

默认情况下，R6从AS1学到VPNv4的路由再通告给R10（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。

R9#showipcefvrftest11.11.11.11

11.11.11.11/32,version34,epoch0,cachedadjacency192.168.2.9

0packets,0bytes

 taginformationset,allrewritesowned

   localtag:

VPNroutehead

   fasttagrewritewithFa0/0,192.168.2.9,tagsimposed{840427}

 via192.168.0.5,0dependencies,recursive

   nexthop192.168.2.9,FastEthernet0/0via192.168.0.5/32（Default）

   validcachedadjacency

tagrewritewithFa0/0,192.168.2.9,tagsimposed{840427}

R11#traceroute12.12.12.12

Typeescapesequencetoabort.

Tracingtherouteto12.12.12.12

 110.0.0.160msec140msec168msec

 2192.168.1.2[MPLS:

Labels232/643Exp0]1008msec1028msec936msec

 3192.168.1.6[MPLS:

Labels332/643Exp0]840msec1004msec816msec

 4192.168.1.10[MPLS:

Labels426/643Exp0]888msec836msec768msec

 5192.168.0.6[MPLS:

Label643Exp0]768msec812msec1176msec //只有单层标签

 6192.168.2.2[MPLS:

Labels717/939Exp0]888msec932msec936msec

 7192.168.2.6[MPLS:

Labels813/939Exp0]792msec740msec816msec

 810.0.0.5[AS20][MPLS:

Label939Exp0]796msec688msec984msec

 910.0.0.6[AS20]1032msec884msec984msec

R11#

R4和R6上只保存本AS内的VPNv4的路由。

R4#showmplsforwarding-table

Local Outgoing   Prefix           Bytestag Outgoing  NextHop   

tag   tagorVC  orTunnelId     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   Poptag    192.168.1.16/30  0         Fa1/1     192.168.1.9 

419   Poptag    192.168.1.4/30   0         Fa1/1     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   Poptag    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   Poptag    192.168.0.6/32   640       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#showmplsforwarding-table

Local Outgoing   Prefix           Bytestag Outgoing  NextHop   

tag   tagorVC  orTunnelId     switched  interface             

608   Untagged   4.4.4.4/32       0         Fa0/0     192.168.0.1 

609   Poptag    192.168.0.1/32   0         Fa0/0     192.168.0.1 

610   Poptag    192.168.2.12/30  0         Fa1/0     192.168.2.2 

611   Poptag    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   Poptag    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   1216      Fa1/0     192.168.2.2 

642   Poptag    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：

hostnameR4

!

boot-start-marker

boot-end-marker

!

!

ipsubnet-zero

!

!

ipcef

noipdomain-lookup

mplslabelrange400499

mplslabelprotocolldp

!

!

!

interfaceLoopback0

 ipaddress4.4.4.4255.255.255.255

 noipdirected-broadcast

!

interfaceTunnel0

 ipaddress192.168.0.5255.255.255.252

 noipdirected-broadcast

 mplsbgpforwarding

 tunnelsourceLoopback0

 tunneldestination6.6.6.6

!

interfaceFastEthernet0/0

 ipaddress192.168.0.1255.255.255.252

 noipdirected-broadcast

 mplsbgpforwarding

!

interfaceFastEthernet1/0

 noipaddress

 noipdirected-broadcast

 shutdown

 duplexhalf

 speedauto

!

interfaceFastEthernet1/1

 ipaddress192.168.1.10255.255.255.252

 noipdirected-broadcast

 duplexhalf

 speedauto

 tag-switchingip

!

routerospf1

 log-adjacency-changes

 redistributeconnectedsubnets

 network4.4.4.40.0.0.0area0

 network192.168.1.80.0.0.3area0

!

routerbgp1

 nobgpdefaultroute-targetfilter

 bgplog-neighbor-changes

 neighbor5.5.5.5remote-as1

 neighbor5.5.5.5update-sourceLoopback0

 neighbor192.168.0.6remote-as2

 !

 address-familyipv4

 neighbor5.5.5.5activate

 noneighbor192.168.0.6activate

 noauto-summary

 nosynchronization

 exit-address-family

 !

 address-familyvpnv4

 neighbor5.5.5.5activate

 neighbor5.5.5.5send-communityboth

 neighbor192.168.0.6activate

 neighbor192.168.0.6send-communityboth

 exit-address-family

!

ipclassless

iproute6.6.6.6255.255.255.255192.168.0.2

!

!

!

control-plane

!

!

linecon0

 exec-timeout00

 stopbits1

lineaux0

 stopbits1

linevty04

 login

!

nocnsaaaenable

R6的配置：

hostnameR6

!

boot-start-marker

boot-end-marker

!

!

ipsubnet-zero

!

!

ipcef

noipdomain-lookup

mplslabelrange600699

mplslabelprotocolldp

!

!

!

interfaceLoopback0

 ipaddress6.6.6.6255.255.255.255

 noipdirected-broadcast

!

interfaceTunnel0

 ipaddress192.168.0.6255.255.255.252

 noipdirected-broadcast

 mplsbgpforwarding

 tunnelsourceLoopback0

 tunneldestination4.4.4.4

!

interfaceFastEthernet0/0

 ipaddress192.168.0.2255.255.255.252

 noipdirected-broadcast

 mplsbgpforwarding

!

interfaceFastEthernet1/0

 ipaddress192.168.2.1255.255.255.252

 noipdirected-broadcast

 duplexhalf

 speedauto

 tag-switchingip

!

interfaceFastEthernet1/1

 noipaddress

 noipdirected-broadcast

 shutdown

 duplexhalf

 speedauto

!

routerodr

!

routerospf1

 log-adjacency-changes

 redistributeconnectedsubnets

 network6.6.6.60.0.0.0area0

 network192.168.2.00.0.0.3area0

!

routerbgp2

 nosynchronization

 nobgpdefaultroute-targetfilter

 bgplog-neighbor-changes

 neighbor10.10.10.10remote-as2

 neighbor10.10.10.10update-sourceLoopback0

 neighbor192.168.0.5remote-as1

 noauto-summary

 !

 address-familyvpnv4

 neighbor10.10.10.10activate

 neighbor10.10.10.10send-communityboth

 neighbor192.168.0.5activate

 neighbor192.168.0.5send-communityboth

 exit-address-family

!

ipclassless

iproute4.4.4.4255.255.255.255192.168.0.1

!

!

!

tag-switchingtdprouter-idLoopback0

control-plane

!

!

linecon0

 exec-timeout00

 stopbits1

lineaux0

 stopbits1

linevty04

 login

!

nocnsaaaenable

end

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#showipcefvrftest11.11.11.11

11.11.11.11/32,version37,epoch0,cachedadjacency192.168.2.9

0packets,0bytes

 taginformationset,allrewritesowned

   localtag:

VPNroutehead

   fasttagrewritewithFa0/0,192.168.2.9,tagsimposed{810645}

 via6.6.6.6,0dependencies,recursive

   nexthop192.168.2.9,FastEthernet0/0via6.6.6.6/32（Default）

   validcachedadjacency

   tagrewritewithFa0/0,192.168.2.9,tagsimposed{810645}

R6#showmplsforwarding-table

Local Outgoing   Prefix           Bytestag Outgoing  NextHop   

tag   tagorVC  orTunnelId     switched  interface             

608   Untagged   4.4.4.4/32       0         Fa0/0     192.168.0.1 

609   Poptag    192.168.0.1/32   0         Fa0/0     192.168.0.1 

610   Poptag    192.168.2.12/30  0         Fa1/0     192.168.2.2 

611   Poptag    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   Poptag    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   Poptag    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#showmplsforwarding-table

Local Outgoing   Prefix           Bytesta