Router PEA
!
ip vrf vpn-a
rd 65001:1
route-target export 65001:1
route-target import 65001:1
!
ip vrf vpn-b
rd 65001:2
route-target export 65001:2
route-target import 65001:2
interface Serial1/0
ip vrf forwarding vpn-a
ip address 172.16.3.1 255.255.255.0
!
interface Serial1/2
ip vrf forwarding vpn-b
ip address 172.16.5.1 255.255.255.252
Router PEB
!
ip vrf vpn-a
rd 65001:1
route-target export 65001:1
route-target import 65001:1
!
ip vrf vpn-b
rd 65001:2
route-target export 65001:2
route-target import 65001:2
!
interface Serial1/1
ip vrf forwarding vpn-a
ip address 172.16.4.1 255.255.255.0
!
interface Serial1/2
ip vrf forwarding vpn-b
ip address 172.16.5.5 255.255.255.252
!
1.3配置PE-PE的路由会话
配置PE-PE的路由主要完成下列任务:
启用BGP;
关闭ipv4单播前缀的通告;
配置PE的邻居PE;
激活IPv4到邻居的通告。
Router PEA
!
router bgp 4837
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 1.1.1.3 remote-as 4837
neighbor 1.1.1.3 update-source Loopback0
!
address-family vpnv4
neighbor 1.1.1.3 activate
neighbor 1.1.1.3 send-community extended
exit-address-family
!
Router PEB
!
router bgp 4837
no synchronization
bgp log-neighbor-changes
neighbor 1.1.1.2 remote-as 4837
neighbor 1.1.1.2 update-source Loopback0
no auto-summary
!
address-family vpnv4
neighbor 1.1.1.2 activate
neighbor 1.1.1.2 send-community extended
exit-address-family
!
1.4配置BGP4的PE-CE的路由选择会话
Router PEA
!
router bgp 4837
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 1.1.1.3 remote-as 4837
neighbor 1.1.1.3 update-source Loopback0
!
address-family vpnv4
neighbor 1.1.1.3 activate
neighbor 1.1.1.3 send-community extended
exit-address-family
!
address-family ipv4 vrf vpn-b
neighbor 172.16.5.2 remote-as 65003
neighbor 172.16.5.2 activate
no synchronization
network 172.16.5.0 mask 255.255.255.252
exit-address-family
!
address-family ipv4 vrf vpn-a
neighbor 172.16.3.2 remote-as 65001
neighbor 172.16.3.2 activate
no synchronization
network 172.16.3.0 mask 255.255.255.0
exit-address-family