Cisco Cisco IOS Software Release 12.0(22)S

 describes the sample configuration shown in 

.

ip cef

interface Loopback0

ip address aa.aa.aa.aa 255.255.255.255

!

interface Ethernet3/3

 ip address mm.0.0.1 255.0.0.0

!

router bgp 300

 no synchronization

 bgp log-neighbor-changes

 timers bgp 10 30

 redistribute connected                              !Exchange routes

 neighbor mm.0.0.2 remote-as 200                     !learned from PE1.

 neighbor mm.0.0.2 advertisement-interval 5

 no auto-summary 

ip cef

!

ip vrf vpn2

 rd 200:1

 route-target export 200:1

 route-target import 200:1

mpls label protocol ldp

!

interface Loopback0

 ip address bb.bb.bb.bb 255.255.255.255

!

CE1 and CE2

Belong to an end customer. CE1 and CE2 routers exchange routes learned 
from PE routers.

The end customer is purchasing VPN services from a customer carrier.

PE1 and PE2

Part of a customer carrier network that is configured to provide MPLS VPN 
services. PE1 and PE2 are peering with a VPNv4 IBGP session to form a 
MPLS VPN network.

CSC-CE1 and 
CSC-CE2

Part of a customer carrier network. CSC-CE1 and CSC-CE2 routers 
exchange IPv4 BGP updates with MPLS labels and redistribute PE loopback 
addressees to and from the IGP (OSPF in this example).

The customer carrier is purchasing carrier supporting carrier VPN services 
from a backbone carrier.

CSC-PE1 and 
CSC-PE2

Part of the backbone carrier’s network configured to provide carrier 
supporting carrier VPN services. CSC-PE1 and CSC-PE2 are peering with a 
VPNv4 IP BGP session to form the MPLS VPN network. In the VRF, 
CSC-PE1 and CSC-PE2 are peering with the CSC-CE routers, which are 
configured for carrying MPLS labels with the routes, with an IPv4 EBGP 
session.