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思科路由器MPLS VPN PE与CE间运行BGP

时间:2022-11-17 11:11 作者:小编 阅读量:0

实验目的

在PE和CE之间配置BGP

拓扑与需求

思科路由器MPLS VPN PE与CE间运行BGP

每台设备都有一个Lo0,地址分别为X.X.X.X/32(X为设备编号);

设备间互联链路网段采用两台设备的编号,例如R1与R2互联链路网段为12.1.1.0/24,以此类推;

R2、R3、R4、R5运行RIPv2,关闭自动汇总,宣告环回口和直连,但是R2不宣告12.1.1.0/24网段,R5不宣告56.1.1.0/24网段;

R1与R2建立eBGP邻居关系并且宣告Loopback0接口;

R6与R5建立eBGP邻居关系并且宣告Loopback0接口;

R2和R5启用MP-BGP,使用Lo0建立VPNv4邻居传递客户路由,R2把路由1.1.1.1/32传给R5,R5把路由6.6.6.6/32传给R2,使得两个CE之间能够互访;

R2和R5之间是MPLS域,要求启用MPLS;

Cisco IOS Version 15.2。

配置与实现

IP地址和IGP配置:

配置R1:

interface Loopback0

ip address 1.1.1.1 255.255.255.255

!

interface Serial2/0

ip address 12.1.1.1 255.255.255.0

no shutdown

!

配置R2:

interface Loopback0

ip address 2.2.2.2 255.255.255.255

!

interface Serial2/0

ip address 12.1.1.2 255.255.255.0

no shutdown

!

interface Ethernet1/0

ip address 23.1.1.2 255.255.255.0

no shutdown

!

router rip

version 2

network 2.0.0.0

network 23.0.0.0

no auto-summary

配置R3:

interface Loopback0

ip address 3.3.3.3 255.255.255.255

!

interface Ethernet1/0

ip address 23.1.1.3 255.255.255.0

no shutdown

!

interface Ethernet1/1

ip address 34.1.1.3 255.255.255.0

no shutdown

!

router rip

version 2

network 3.0.0.0

network 23.0.0.0

network 34.0.0.0

no auto-summary

配置R4:

interface Loopback0

ip address 4.4.4.4 255.255.255.255

!

interface Ethernet1/0

ip address 34.1.1.4 255.255.255.0

no shutdown

!

interface Ethernet1/1

ip address 45.1.1.4 255.255.255.0

no shutdown

!

router rip

version 2

network 4.0.0.0

network 34.0.0.0

network 45.0.0.0

no auto-summary

配置R5:

interface Loopback0

ip address 5.5.5.5 255.255.255.255

!

interface Serial2/0

ip address 56.1.1.5 255.255.255.0

no shutdown

!

interface Ethernet1/0

ip address 45.1.1.5 255.255.255.0

no shutdown

!

router rip

version 2

network 5.0.0.0

network 45.0.0.0

no auto-summary

配置R6:

interface Loopback0

ip address 6.6.6.6 255.255.255.255

!

interface Serial2/0

ip address 56.1.1.6 255.255.255.0

no shutdown

控制层面实现:

配置R1:

router bgp 2

no auto-summary

no synchronization

bgp router-id 1.1.1.1

neighbor 12.1.1.2 remote-as 1

network 1.1.1.1 mask 255.255.255.255

配置R2:

ip vrf xmws //建立虚拟的转发路由器,隔离客户的路由

rd 2:2 //设置RD值,用于区分不同客户的路由

route-target export 100:100 //设置RT值,使得VPN路由能够被PE接收

route-target import 100:100

!

interface s2/0

ip vrf forwarding xmws //把S2/0接口划入虚拟路由器xmws

ip address 12.1.1.2 255.255.255.0

!

router bgp 1 //启用MP-BGP传递客户路由

no auto-summary

no synchronization

bgp router-id 2.2.2.2

neighbor 5.5.5.5 remote-as 1

neighbor 5.5.5.5 up lo0 //VPNv4模块将来会借用全局的路由建邻居

address-family ipv4 vrf xmws //启用BGP VRF模块,用来收集VRF的路由

neighbor 12.1.1.1 remote-as 2 //PE跟CE运行BGP直接在vrf模块下neighbor

neighbor 12.1.1.1 as-override //用自己的as-path覆盖相同的as-path

address-family vpnv4 //启用BGP VPNv4模块,用来收集所有VRF的路由

neighbor 5.5.5.5 activate //借用全局的邻居(激活VPNv4邻居)

配置R5:

ip vrf wisdom

rd 5:5

route-target export 100:100

route-target import 100:100

!

interface Serial2/0

ip vrf forwarding wisdom

ip address 56.1.1.5 255.255.255.0

!

router bgp 1

no auto-summary

no synchronization

bgp router-id 5.5.5.5

neighbor 2.2.2.2 remote-as 1

neighbor 2.2.2.2 up lo0

address-family ipv4 vrf wisdom

neighbor 56.1.1.6 remote-as 2

address-family vpnv4

neighbor 2.2.2.2 activate

配置R6:

router bgp 2

no auto-summary

no synchronization

bgp router-id 6.6.6.6

neighbor 56.1.1.5 remote-as 1

network 6.6.6.6 mask 255.255.255.255

neighbor 56.1.1.5 allowas-in 1 //允许收到路由的as-path中如果有相同的as,允许as号跟我重复几次

数据层面实现:

配置R2:

mpls ldp router-id Loopback0

mpls label range 200 299

!

interface Ethernet1/0

mpls ip

配置R3:

mpls ldp router-id Loopback0

mpls label range 300 399

!

interface Ethernet1/0

mpls ip

!

interface Ethernet1/1

mpls ip

配置R4:

mpls ldp router-id Loopback0

mpls label range 400 499

!

interface Ethernet1/0

mpls ip

!

interface Ethernet1/1

mpls ip

配置R5:

mpls ldp router-id Loopback0

mpls label range 500 599

!

interface Ethernet1/0

mpls ip

测试:

思科路由器MPLS VPN PE与CE间运行BGP

来源:微思网络

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