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MPLS VPN中VPNv4 RR的应用

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-01-29 23:31
tags:

-

2021年1月29日发(作者:carnival)



RR


环境的


MPLS VPN


1


、实验目的


:在

< p>
Mpls-VPN



backbone

< p>
区域应用


VPN



RR< /p>


来传递


VPNv4


的路由,


两个


CE



R1

< p>


R5


)可以互相通信



2


、理论支持


:默认情况下,


VPNv4


的路由只有在


RT

< br>中的


import



expor t


吻合的情


况下才会被接收,


除非关闭 针对


RT


的过滤


(用于复杂

< p>
VPN




另外一个就是 我们今天实验的


VPN



RR


的情况,它也打破了


VPNv4



iBGP


的水平分割原则,能否接收并公告


VPNv 4



路由



3



拓扑描述



拓扑如下图所示。


老规矩老习惯,


R1



s1/0


地址为


12.1.1.1< /p>



符合


XY.1.1.X


的规则,


XY


代表设备号)



R2



s1/0=12.1.1.2< /p>


。同时每个设备上有一个环回口


=XX.1.1.1


,如


R1


的环回口


=11. 1.1.1/24


图中


PE1



R2



PE2


为< /p>


R4



R1


和< /p>


R5



CE



4


、实验步骤



步骤


1



Backpone


区域内通过


IGP


,环回口互相可达,本例采用


eigrp


(配置不再赘述)



PE1#sh ip route



ei


PE1#sh ip route



eigrp








34.0.0.0/24 is subnetted, 1 subnets


D








34.1.1.0 [90/30720] via 23.1.1.3, 00:18:30, FastEthernet1/0







33.0.0.0/24 is subnetted, 1 subnets


D








33.1.1.0 [90/156160] via 23.1.1.3, 00:18:30, FastEthernet1/0







44.0.0.0/24 is subnetted, 1 subnets


D








44.1.1.0 [90/158720] via 23.1.1.3, 00:17:14, FastEthernet1/0


PE1#ping 44.1.1.1



Type escape sequence to abort.


Sending 5, 100-byte ICMP Echos to 44.1.1.1, timeout is 2 seconds:


!!!!!


Success rate is 100 percent (5/5), round-trip min/avg/max = 8/36/76 ms



步骤


2


、< /p>


MPLS



LDP

邻居建立


---sh mpls ldp nei



沿途建立


LSP


通道,沿途相关接口配置命 令


mpls ip.



PE1#sh run int f1/0



terface FastEthernet1/0



ip address 23.1.1.2 255.255.255.0



duplex auto



speed auto



mpls ip



R3#sh mpls ldp neighbor







Peer LDP Ident: 22.1.1.1:0; Local LDP Ident 33.1.1.1:0










TCP connection: 22.1.1.1.646 - 33.1.1.1.15237










State: Oper; Msgs sent/rcvd: 29/29; Downstream










Up time: 00:18:29










LDP discovery sources:












FastEthernet1/0, Src IP addr: 23.1.1.2










Addresses bound to peer LDP Ident:












23.1.1.2









22.1.1.1














Peer LDP Ident: 44.1.1.1:0; Local LDP Ident 33.1.1.1:0










TCP connection: 44.1.1.1.31420 - 33.1.1.1.646










State: Oper; Msgs sent/rcvd: 28/29; Downstream










Up time: 00:18:19










LDP discovery sources:












FastEthernet1/1, Src IP addr: 34.1.1.4










Addresses bound to peer LDP Ident:












34.1.1.4









44.1.1.1


当然可以通过


mpls label range 100 2 00


配置分配的标签范围,


通过


mpl s ldp router-id loopback


0 force


指定


router-id


, 注意此环回口必须在其


LDP


的邻居路由可达,否则将无法建立


ldp





如在


PE1


增加环回口


loopback1


,并将其指定为


LDP router-ID


PE1(config)#mpls ldp router- id lo1 force



而该地址在

R3


不可达



R3#sh ip route 111.1.1.0




% Network not in table


则该


LDP


邻居会断掉,而会选择其他接口建立


L DP


邻居




3


、建立


VRF(


虚拟路由转发


)----sh ip vrf detail(note


:连接


CE


的接口才能划入


VRF)


R1


ip vrf YESLAB



rd 100:1



route- target export 100:1



route- target import 100:1



interface Serial2/0



ip vrf forwarding YESLAB



ip address 12.1.1.2 255.255.255.0



PE1#sh ip vrf detail



VRF YESLAB; default RD 100:1; default VPNID




Interfaces:






Se2/0





















VRF Table ID = 1




Export VPN route-target communities






RT:100:1




















Import VPN route-target communities






RT:100:1




















No import route-map




No export route-map




VRF label distribution protocol: not configured




VRF label allocation mode: per-prefix



4



MP-BGP

< br>先建立


BGP


关系



R1


router bgp 1



no synchronization



bgp router-id 22.1.1.1



bgp log-neighbor-changes



neighbor 33.1.1.1 remote-as 1



neighbor 33.1.1.1 update- source Loopback0



no auto- summary


R3


作为


RR


router bgp 1



no synchronization



bgp log- neighbor-changes



neighbor 22.1.1.1 remote-as 1



neighbor 22.1.1.1 update-source Loopback0



neighbor 22.1.1.1 route-reflector-client



neighbor 44.1.1.1 remote-as 1



neighbor 44.1.1.1 update- source Loopback0



neighbor 44.1.1.1 route-reflector-client



no auto-summary


R3#sh ip bgp summary



BGP router identifier 33.1.1.1, local AS number 1


BGP table version is 1, main routing table version 1



Neighbor









V





AS MsgRcvd MsgSent




TblVer



InQ OutQ Up/Down


22.1.1.1









4






1







34







34









1





0





0 00:19:07


44.1.1.1









4






1







33







32









1





0





0 00:19:10




BGP


进程下建立


MP- BGP


关系



R1



router bgp 1


address-family vpnv4




neighbor 33.1.1.1 activate




neighbor 33.1.1.1 send-community extended



exit-address-family


R3


router bgp 1



address-family vpnv4




neighbor 22.1.1.1 activate




neighbor 22.1.1.1 send-community extended




neighbor 22.1.1.1 route- reflector-client




neighbor 44.1.1.1 activate




neighbor 44.1.1.1 send- community extended




neighbor 44.1.1.1 route-reflector- client



exit-address-family



R3#sh ip bgp vpnv4 all su


BGP router identifier 33.1.1.1, local AS number 1


BGP table version is 5, main routing table version 5


4 network entries using 624 bytes of memory


4 path entries using 272 bytes of memory


5/4 BGP path/bestpath attribute entries using 740 bytes of memory


2 BGP extended community entries using 80 bytes of memory


0 BGP route-map cache entries using 0 bytes of memory


0 BGP filter- list cache entries using 0 bytes of memory


Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory


BGP using 1748 total bytes of memory


State/PfxRcd








0








0





BGP activity 4/0 prefixes, 4/0 paths, scan interval 15 secs



Neighbor









V





AS MsgRcvd MsgSent




TblVer



InQ OutQ Up/Down



State/PfxRcd


22.1.1.1









4






1







37







37









5





0





0 00:21:52









2


44.1.1.1









4






1







36







35









5





0





0 00:21:55









2



步骤


5


、< /p>


PE



CE


的邻 居以及重分布



CE


运行标准的


ospf


CE1#


router ospf 1



log-adjacency-changes



network 11.1.1.1 0.0.0.0 area 0



network 12.1.1.1 0.0.0.0 area 0


PE




PE1#


router ospf 1 vrf YESLAB



log-adjacency- changes



redistribute bgp 1 subnets



network 12.1.1.2 0.0.0.0 area 0


PE1#sh ip os nei



Neighbor ID






Pri




State












Dead Time




Address










Interface


11.1.1.1











0




FULL/



-









00:00:36





12.1.1.1









Serial2/0


PE1


Router bgp 1


address-family ipv4 vrf YESLAB




redistribute ospf 1 vrf YESLAB match internal external 1 external 2




no synchronization



exit- address-family



----

< br>缺省情况下只重分步


ospf


的内部路由,诸如如果


CE


有外部路由,切记加上


externa l





PE1#sh ip bgp vpnv4 all



BGP table version is 9, local router ID is 22.1.1.1


Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
















r RIB-failure, S Stale


Origin codes: i - IGP


, e - EGP


, ? - incomplete






Network











Next Hop













Metric LocPrf Weight Path


Route Distinguisher: 100:1 (default for vrf YESLAB)


*> 11.1.1.1/32







12.1.1.1

















65










32768 ?


*> 12.1.1.0/24







0.0.0.0



















0










32768 ?


*>i45.1.1.0/24







44.1.1.1


















0





100







0 ?


*>i55.1.1.1/32







44.1.1.1

















65





100







0 ?


PE1#sh ip route vrf YESLAB

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