运营商增值服务技术；配置基本的MPLSVPN（二）PE到CE链路的配；目录；提要；正文；TOPO如下；基本配置如下测试；提要：PE到CE链路的配置---OSPF；PE到CE链路使用OSPF连接，各站点将对方看作；PandPERouters；?CiscoIOS?SoftwareReleas；?AnyCiscorouterfromthe72；CandCERout
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配置基本的MPLS VPN（二）PE到CE链路的配置选项---OSPF Document ID: 00022
目录
提要
正文
TOPO如下
基本配置如下 测试
提要：PE到CE链路的配置---OSPF
PE到CE链路使用OSPF连接，各站点将对方看作是区域间的路由。
P and PE Routers
? Cisco IOS? Software Release 12.2(6h) includes the MPLS VPN feature.
? Any Cisco router from the 7200 series or higher supports P functionality. The Cisco 2691, as well as any 3640 series or higher router supports PE functionality.
C and CE Routers
? You can use any router that can exchange routing information with its PE router.
正文：
MPLS快速配置导航
1、 配置IGP
2、 启用MPLS
3、 在PE上面使用ip vrf <VPN routing/forwarding instance name>命令为每个VPN创建VRF，为每个VRF指定RD和RT，并把VRF绑定到接口，使用show ip vrf detail查看VRF信息
⑴RD：是为了区分不同客户的前缀，解决地址冲突问题 ，本地意义
命令rd <VPN route distinguisher>
⑵RT：是为了区分不同VPN客户，把VPNv4路由放进哪个VRF路由表里面 route?target [export|import|both] <target VPN extended community>
⑶绑定ip vrf forwarding <VPN routing/forwarding instance name>
4、配置MP－BGP
⑴指定邻居
⑵使用命令address?family ipv4 vrf <VPN routing/forwarding instance name>进入子模式，根据需要进行以下配置
..重分布静态,RIPv2或者OSPF信息，如果CE与PE通过BGP，自动重分布进来..重分布直连
..激活与CE的BGP邻居关系
⑶使用命令 address?family vpnv4进入BGP VPNv4地址族
..激活邻居
..指定扩展社团属性必须被使用（老版本需要）
5、配置PE-CE链路的路由协议并且重分布MP-BGP进程（如果用BGP连接的话就不用重分布） TOPO如下：
完整配置如下：
z PE-R1
z PE-R2
z PE-R3
z P-R4
z CustomerA-R5
z CustomerA-R6
z CustomerB-R7
z CustomerB-R8
PE-R1完整配置
!
hostname PE-R1
!
ip vrf customerA
rd 1:100
route-target export 1:100
route-target import 1:100
! 创建一个VRF
ip cef
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255 !
interface Ethernet0/0
no ip address
!
interface Ethernet0/0.14
description **Link to PE-R4**
encapsulation dot1Q 14
ip address 14.1.1.1 255.255.255.0
ip router isis
tag-switching ip
no snmp trap link-status
!
interface Ethernet0/0.15
description **Link to CustomerA-R5** encapsulation dot1Q 15
ip vrf forwarding customerA
ip address 15.1.1.1 255.255.255.0
no snmp trap link-status
!绑定VRF
router ospf 100 vrf customerA
log-adjacency-changes
redistribute bgp 1 subnets
network 15.1.1.0 0.0.0.255 area 0
!PE与CE连接使用OSPF,把MP-BGP学到的路由重分布进VRF
router isis
net 10.0010.0100.1001.00
is-type level-2-only
passive-interface Loopback0
!
router bgp 1
no synchronization
bgp router-id 1.1.1.1
bgp log-neighbor-changes
neighbor 4.4.4.4 remote-as 1
neighbor 4.4.4.4 update-source Loopback0 no auto-summary
!
address-family vpnv4
neighbor 4.4.4.4 activate
neighbor 4.4.4.4 send-community extended exit-address-family
!在VPNv4地址族下激活4.4.4.4
address-family ipv4 vrf customerA redistribute ospf 100
no auto-summary
no synchronization
exit-address-family
!把OSPF路由重分布进MP-BGP
PE-R2完整配置
!
hostname PE-R2
!
ip vrf customerA
rd 1:100
route-target export 1:100
route-target import 1:100
!
ip vrf customerB
rd 1:200
route-target export 1:200
route-target import 1:200
!
ip cef
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255 !
interface Ethernet0/0
no ip address
!
interface Ethernet0/0.23
description **Link to PE-R3** encapsulation dot1Q 23
ip address 23.1.1.2 255.255.255.0 ip router isis
tag-switching ip
no snmp trap link-status
!
interface Ethernet0/0.24
description **Link to PE-R4** encapsulation dot1Q 24
ip address 24.1.1.2 255.255.255.0 ip router isis
tag-switching ip
no snmp trap link-status
!
interface Ethernet0/0.26
description **Link to CustomerA-R6** encapsulation dot1Q 26
ip vrf forwarding customerA
ip address 26.1.1.2 255.255.255.0 no snmp trap link-status
!
interface Ethernet0/0.27
description **Link to CustomerB-R7** encapsulation dot1Q 27
ip vrf forwarding customerB
ip address 27.1.1.2 255.255.255.0 no snmp trap link-status
!
router ospf 100 vrf customerA log-adjacency-changes
redistribute bgp 1 subnets
network 26.1.1.0 0.0.0.255 area 0 !
router ospf 200 vrf customerB log-adjacency-changes
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