Mpls vpn跨域optionB有两种方式.docx

Mpls vpn跨域optionB有两种方式.docx

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Mplsvpn跨域optionB有两种方式

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：

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

LocalOutgoingPrefixBytestagOutgoingNextHop

tagtagorVCorTunnelIdswitchedinterface

416Untagged6.6.6.6/320Fa0/0192.168.0.2

4171101:

1:

10.0.0.0/30610Fa1/1192.168.1.9

418Poptag192.168.1.16/300Fa1/1192.168.1.9

419Poptag192.168.1.4/300Fa1/1192.168.1.9

420303192.168.1.12/300Fa1/1192.168.1.9

421300192.168.1.0/300Fa1/1192.168.1.9

4223011.1.1.1/3215844Fa1/1192.168.1.9

4233022.2.2.2/320Fa1/1192.168.1.9

424Poptag3.3.3.3/320Fa1/1192.168.1.9

4253285.5.5.5/323573Fa1/1192.168.1.9

426Poptag192.168.0.6/32640Tu0point2point

4271381:

1:

11.11.11.11/32\

5068Fa1/1192.168.1.9

4281371:

1:

192.168.10.0/24\

0Fa1/1192.168.1.9

R6#showmplsforwarding-table

LocalOutgoingPrefixBytestagOutgoingNextHop

tagtagorVCorTunnelIdswitchedinterface

608Untagged4.4.4.4/320Fa0/0192.168.0.1

609Poptag192.168.0.1/320Fa0/0192.168.0.1

610Poptag192.168.2.12/300Fa1/0192.168.2.2

611Poptag192.168.2.4/300Fa1/0192.168.2.2

612714192.168.2.16/300Fa1/0192.168.2.2

613716192.168.2.8/300Fa1/0192.168.2.2

614Poptag7.7.7.7/320Fa1/0192.168.2.2

6157158.8.8.8/320Fa1/0192.168.2.2

6407179.9.9.9/320Fa1/0192.168.2.2

64171310.10.10.10/321216Fa1/0192.168.2.2

642Poptag192.168.0.5/32640Tu0point2point

6439391:

1:

12.12.12.12/32\

610Fa1/0192.168.2.2

6449381:

1:

192.168.20.0/24\

0Fa1/0192.168.2.2

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

LocalOutgoingPrefixBytestagOutgoingNextHop

tagtagorVCorTunnelIdswitchedinterface

608Untagged4.4.4.4/320Fa0/0192.168.0.1

609Poptag192.168.0.1/320Fa0/0192.168.0.1

610Poptag192.168.2.12/300Fa1/0192.168.2.2

611Poptag192.168.2.4/300Fa1/0192.168.2.2

612714192.168.2.16/300Fa1/0192.168.2.2

613716192.168.2.8/300Fa1/0192.168.2.2

614Poptag7.7.7.7/320Fa1/0192.168.2.2

6157158.8.8.8/320Fa1/0192.168.2.2

6407179.9.9.9/320Fa1/0192.168.2.2

64171310.10.10.10/320Fa1/0192.168.2.2

642Poptag192.168.0.5/325068Tu0point2point

6439391:

1:

12.12.12.12/32\

2956Fa1/0192.168.2.2

6449381:

1:

192.168.20.0/24\

0Fa1/0192.168.2.2

6454271:

1:

11.11.11.11/32\

0Tu0point2point

6464281:

1:

192.168.10.0/24\

0Tu0point2point

6474171:

1:

10.0.0.0/300Tu0point2point

R4#showmplsforwarding-table

LocalOutgoingPrefixBytestagOutgoingNextHop

tagtagorVCorTunnelIdswitchedinterface

416Untagged6.6.6.6/320Fa0/0192.168.0.2

4171101:

1:

10.0.0.0/304894Fa1/1192.168.1.9

418Poptag192.168.1.16/300Fa1/1192.168.1.9

419Poptag192.168.1.4/300Fa1/1192.168.1.9

420303192.168.1.12/300Fa1/1192.168.1.9

421300192.168.1.0/300Fa1/1192.168.1.9

4223011.1.1.1/3215844Fa1/1192.168.1.9

4233022.2.2.2/320Fa1/1192.168.1.9

424Poptag3.3.3.3/320Fa1/1192.168.1.9

4253285.5.5.5/323573Fa1/1192.168.1.9

426Poptag192.168.0.6/322680Tu0point2point

4271381:

1:

11.11.11.11/32\

5068Fa1/1192.168.1.9

4281371:

1:

192.168.10.0/24\

0Fa1/1192.168.1.9

4296441:

1:

192.168.20.0/24\

0Tu0point2point

4486431:

1:

12.12.12.12/32\

0Tu0point2point

4496091:

1:

10.0.0.4/300Tu0point2point

R11#traceroute12.12.12.12

Typeescapesequencetoabort.

Tracingtherouteto12.12.12.12

110.0.0.1112msec88msec100msec

2192.168.1.2[MPLS:

Labels205/448Exp0]912msec884msec936msec

3192.168.1.6[MPLS:

Labels329/448Exp0]984msec1008msec884msec

4192.168.1.10[MPLS:

Label448Exp0]936msec812msec888msec

5192.168.0.6[MPLS:

Label643Exp0]840msec764msec860msec//标签由448变成643

6192.168.2.2[MPLS:

Labels717/939Exp0]912msec764msec1080msec

7192.168.2.6[MPLS:

Labels813/939Exp0]1008msec884msec864msec

810.0.0.5[AS20][MPLS:

Label939Exp0]744msec764msec792msec

910.0.0.6[AS20]864msec812msec888msec

R4的配置

routerospf1

log-adjacency-changes

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-f