一个基本的MPLSBGPVPN配置

　　 
　　ip vrf vrf00001
　　rd 888:1
　　route-target both 888:1
　　ip vrf vrf00002
　　rd 888:2
　　route-target both 888:2
　　route-target import 888:1
　　import map vrf00002-import-map
　　

　　route-map vrf00002-import-map permit 10
　　match ...
　　
　　It is important to note that the route map is only needed for fine tuning. Normal import/export with VRFs can just extended communities. The thought of security depending on getting route maps built right rather scares me. Luckily, basic security is provided at the extended community level, making route hiding the normal situation. Then route maps can be used to limit connectivity to extranet partner sites, if the customers don't wish to do that for themselves by speaking BGP to the PE routers.
　　These VRFs would typically then be associated with interfaces:
　　
　　interface Fastethernet 0/2
　　ip vrf forwarding vrf00001
　　ip address ...
　　interface Fastethernet 0/3
　　ip vrf forwarding vrf00002
　　ip address ...
　　interface Fastethernet 0/4
　　ip vrf forwarding vrf00002
　　ip address ...
　　VRF vrf00002 is associated with two interfaces that connect to two sites for Customer B. I'm deliberately showing FastEthernet, since some people now think that's how we'll be connecting to SPs in metropolitan settings. (Think BLEC: Building Local Exchange Carrier, providing VPN, Internet, and Voice connectivity).
　　We need to be speaking MBGP to carry VPN-IPv4 routes and attributes to peer PE routers. We don't need ordinary BGP routes to PE peers however. (On a larger scale, we might use route reflectors vice iMBGP full-mesh peering):
　　
　　router bgp 888
　　no synchronization ! don't do IGP synchronization (since
　　! the IGP won't carry the right routes anyway)
　　no bgp default ipv4-activate ! don't do ordinary BGP
　　neighbor 10.60.0.5 remote-as 888 ! identify an iBGP neighbor and AS
　　neighbor 10.61.0.1 remote-as 888 ! identify another
　　address-family vpnv4 unicast
　　neighbor 10.60.0.5 activate ! activate session to some MBGP peer
　　neighbor 10.61.0.1 activate ! some other MBGP peer
　　exit-address-family
　　
　　Our design might use eBGP to communicate routes to CE routers in a controlled way, to get routes into each VRF. Or it might use static routing, or some other mix. We can also define per-VRF static routes as shown below.
　　address-family ipv4 unicast vrf vrf00001
　　redistribute static
　　redistribute connected
　　neighbor 10.20.1.1 remote-as 65535 ! private AS number
　　neighbor 10.20.1.1 activate
　　no auto-summary
　　exit-address-family
　　address-family ipv4 unicast vrf vrf00002
　　redistribute static
　　redistribute connected
　　neighbor 10.20.2.2 remote-as 65535
　　neighbor 10.20.2.2 activate
　　no auto-summary
　　exit-address-family
　　
　　ip route vrf vrf00001 15.0.0.0 255.0.0.0 e0/2 10.20.1.1

原文转自：http://www.ltesting.net