R1 Config
ip vrf one
rd 1:1
route-target export 1:1
route-target import 1:1
interface Loopback0
ip address 1.1.1.1 255.255.255.255
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
mpls ip
interface FastEthernet0/1
ip vrf forwarding one
ip address 192.168.15.1 255.255.255.0
router ospf 1
network 1.1.1.1 0.0.0.0 area 0
network 192.168.12.1 0.0.0.0 area 0
router bgp 1
no bgp default ipv4-unicast
neighbor 4.4.4.4 remote-as 1
neighbor 4.4.4.4 update-source Loopback0
address-family vpnv4
neighbor 4.4.4.4 activate
neighbor 4.4.4.4 send-community extended
address-family ipv4 vrf one
redistribute connected
redistribute static
ip route vrf one 5.5.5.5 255.255.255.255 192.168.15.5
ip route vrf one 55.55.55.55 255.255.255.255 192.168.15.5
R4 Config
ip vrf one
rd 1:1
route-target export 1:1
route-target import 1:1
interface Loopback0
ip address 4.4.4.4 255.255.255.255
interface FastEthernet0/0
ip address 192.168.34.4 255.255.255.0
mpls ip
interface FastEthernet0/1
ip vrf forwarding one
ip address 192.168.46.4 255.255.255.0
router ospf 1
network 4.4.4.4 0.0.0.0 area 0
network 192.168.34.4 0.0.0.0 area 0
router bgp 1
no bgp default ipv4-unicast
neighbor 1.1.1.1 remote-as 1
neighbor 1.1.1.1 update-source Loopback0
address-family vpnv4
neighbor 1.1.1.1 activate
neighbor 1.1.1.1 send-community extended
address-family ipv4 vrf one
redistribute connected
redistribute static
ip route vrf one 6.6.6.6 255.255.255.255 192.168.46.6
ip route vrf one 66.66.66.66 255.255.255.255 192.168.46.6
P Routers
R2 Config
interface FastEthernet0/0
ip address 192.168.12.2 255.255.255.0
mpls ip
interface FastEthernet0/1
ip address 192.168.23.2 255.255.255.0
mpls ip
router ospf 1
network 192.168.12.2 0.0.0.0 area 0
network 192.168.23.2 0.0.0.0 area 0
R3 Config
interface FastEthernet0/0
ip address 192.168.23.3 255.255.255.0
mpls ip
interface FastEthernet0/1
ip address 192.168.34.3 255.255.255.0
mpls ip
router ospf 1
network 192.168.23.3 0.0.0.0 area 0
network 192.168.34.3 0.0.0.0 area 0
CE Routers
R5 Config
interface Loopback0
ip address 5.5.5.5 255.255.255.255
interface Loopback1
ip address 55.55.55.55 255.255.255.255
interface FastEthernet0/0
ip address 192.168.15.5 255.255.255.0
ip route 0.0.0.0 0.0.0.0 192.168.15.1
R6 Config
interface Loopback0
ip address 6.6.6.6 255.255.255.255
interface Loopback1
ip address 66.66.66.66 255.255.255.255
interface FastEthernet0/0
ip address 192.168.46.6 255.255.255.0
ip route 0.0.0.0 0.0.0.0 192.168.46.4
Verification
R1#show bgp vpnv4 unicast all summary
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
4.4.4.4 4 1 18 19 13 0 0 00:13:00 3
R1#show bgp vpnv4 unicast all
Route Distinguisher: 1:1 (default for vrf one)
*> 5.5.5.5/32 192.168.15.5 0 32768 ?
*>i6.6.6.6/32 4.4.4.4 0 100 0 ?
*> 55.55.55.55/32 192.168.15.5 0 32768 ?
*>i66.66.66.66/32 4.4.4.4 0 100 0 ?
*> 192.168.15.0 0.0.0.0 0 32768 ?
*>i192.168.46.0 4.4.4.4 0 100 0 ?
R5#ping 6.6.6.6 source loopback 0
!!!!!
Ingress PE router imposes two labels on the customers data packets when forwarding to the egress PE router. The bottom label in the label stack is called vpnv4 label which is used by the egress PE router sending the packet to the appropriate customer. The top label is called transport label that is used in the provider core for the purpose of switching the packets to the respective PE router.
Tracing the VPNv4 Label
R5#traceroute 6.6.6.6
1 192.168.15.1 16 msec 28 msec 4 msec
2 192.168.12.2 [MPLS: Labels 18/19 Exp 0] 80 msec 60 msec 76 msec
3 192.168.23.3 [MPLS: Labels 18/19 Exp 0] 64 msec 116 msec 60 msec
4 192.168.46.4 [MPLS: Label 19 Exp 0] 60 msec 68 msec 52 msec
5 192.168.46.6 88 msec * 140 msec
R1#show bgp vpnv4 unicast vrf one 6.6.6.6
BGP routing table entry for 1:1:6.6.6.6/32, version 5
4.4.4.4 (metric 31) from 4.4.4.4 (4.4.4.4)
Extended Community: RT:1:1
mpls labels in/out nolabel/19
R4#show bgp vpnv4 unicast vrf one labels
Route Distinguisher: 1:1 (one)
6.6.6.6/32 192.168.46.6 19/nolabel
Tracing Transport Label
R1#show mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
18 18 4.4.4.4/32 0 Fa0/0 192.168.12.2
R2#show mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
18 18 4.4.4.4/32 4463 Fa0/1 192.168.23.3
R3#show mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
18 Pop tag 4.4.4.4/32 4748 Fa0/1 192.168.34.4
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