不同AS的PE之间建立Multihop方式的EBGP连接,交换VPNv4路由
ASBR上不保存VPN-IPv4路由,相互之间也不通告VPN-IPv4路由
特点:
VPN路由在入口PE和出口PE之间直接交换,不需要中间设备的保存
VPN路由信息只出现在PE设备上,P和ASBR只负责报文转发,中间域设备可以不支持MPLS VPN业务,只需支持MPLS转发
更适合支持MPLS VPN的负载分担
维护一条端到端的PE连接管理代价比较大
传递路由给PE1
PE1:
ip vpn-instance 1
ipv4-family
route-distinguisher 1:1
vpn-target 100:200 export-extcommunity
vpn-target 100:100 import-extcommunity
#
interface GigabitEthernet0/0/0
ip binding vpn-instance 1
ip address 192.168.1.1 255.255.255.0
#
ospf 100 router-id 1.1.1.1 vpn-instance 1
import-route bgp
area 0.0.0.0
network 192.168.1.0 0.0.0.255
PE2:
ip vpn-instance 1
ipv4-family
route-distinguisher 2:2
vpn-target 100:100 export-extcommunity
vpn-target 100:200 import-extcommunity
#
interface GigabitEthernet0/0/0
ip binding vpn-instan