MPLS L3VPN IOS XR

Elements

       In this example PE routers are IOS XR based and the rest of the devices are IOS based router, ISIS will be the IGP inside the MPLS backbone and OSPF is the PE-CE routing protocol.

R7 and R8 will be our CE routers and R3 will act as the P router

Configuration

R7

R7#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.17.7 255.255.255.0

 duplex full

 speed 100

R7#sh run int lo0

interface Loopback0

 ip address 7.7.7.7 255.255.255.255

router ospf 100

router-id 7.7.7.7

network 7.7.7.7 0.0.0.0 area 0

network 192.1.17.7 0.0.0.0 area 0

XR1

vrf MSSK

 address-family ipv4 unicast

  import route-target

   100:1

  !

  export route-target

   100:1

  !

 !

interface Loopback0

 ipv4 address 1.1.1.1 255.255.255.255

interface GigabitEthernet0/1/0/0.13

 ipv4 address 192.1.13.1 255.255.255.0

 dot1q vlan 13

interface GigabitEthernet0/1/0/0.17

 vrf MSSK

 ipv4 address 192.1.17.1 255.255.255.0

 dot1q vlan 17

router isis 1 à You have to configure ID

 is-type level-2-only

 net 49.0001.0000.0000.0001.00

 address-family ipv4 unicast

  mpls traffic-eng level-2-only

 !

 interface Loopback0

  address-family ipv4 unicast

  !

interface GigabitEthernet0/1/0/0.13

  address-family ipv4 unicast

router ospf 100

 vrf MSSK

  redistribute bgp 100

  area 0

   interface GigabitEthernet0/1/0/0.17

router bgp 100

 address-family vpnv4 unicast

 !

 neighbor 3.3.3.3

  remote-as 100

  update-source Loopback0

  address-family vpnv4 unicast

  !

 !

 vrf MSSK

  rd 100:1

  address-family ipv4 unicast

   redistribute ospf 100

mpls ldp

 router-id 1.1.1.1

interface GigabitEthernet0/1/0/0.13

!

R3

R3#sh run int f0/0

interface FastEthernet0/0

ip address 192.1.13.3 255.255.255.0

duplex full

speed 100

mpls ip

R3#sh run int f0/1

interface FastEthernet0/1

ip address 192.1.23.3 255.255.255.0

duplex full

speed 100

mpls ip

R3#sh run int lo0

interface Loopback0

 ip address 3.3.3.3 255.255.255.255

router isis

net 49.0001.0000.0000.0003.00

passive-interface loopback0

is-type level-2

router bgp 100

no bgp default ipv4-unicast

neighbor 1.1.1.1 remote-as 100

neighbor 1.1.1.1 update-source lo0

neighbor 2.2.2.2 remote-as 100

neighbor 2.2.2.2 update-source lo0

address-family vpnv4

neighbor 1.1.1.1 activate

neighbor 1.1.1.1 send-community both

neighbor 1.1.1.1 route-refelctor-client

neighbor 2.2.2.2 activate

neighbor 2.2.2.2 send-community both

neighbor 2.2.2.2 route-refelctor-client

XR2

vrf MSSK

 address-family ipv4 unicast

  import route-target

   100:1

  !

  export route-target

   100:1

  !

 !

interface Loopback0

 ipv4 address 2.2.2.2 255.255.255.255

interface GigabitEthernet0/4/0/0.23

 ipv4 address 192.1.23.2 255.255.255.0

 dot1q vlan 23

!

interface GigabitEthernet0/4/0/0.28

 vrf MSSK

 ipv4 address 192.1.28.2 255.255.255.0

 dot1q vlan 28

router isis 1

 is-type level-2-only

 net 49.0001.0000.0000.0002.00

 address-family ipv4 unicast

  mpls traffic-eng level-2-only

 !

 interface Loopback0

  address-family ipv4 unicast

  !

interface GigabitEthernet0/4/0/0.23

  address-family ipv4 unicast

  !

router ospf 100

 vrf MSSK

  redistribute bgp 100

  area 0

   interface GigabitEthernet0/4/0/0.28

   !

 router bgp 100

 address-family vpnv4 unicast

 !

 neighbor 3.3.3.3

  remote-as 100

  update-source Loopback0

  address-family vpnv4 unicast

  !

 !

 vrf MSSK

  rd 100:1

  address-family ipv4 unicast

   redistribute ospf 100

  !

 ! mpls ldp

 router-id 2.2.2.2

interface GigabitEthernet0/4/0/0.23

R8

R8#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.28.8 255.255.255.0

 duplex full

 speed 100

R8#sh run int lo0

interface Loopback0

 ip address 8.8.8.8 255.255.255.255

router ospf 100

router-id 8.8.8.8

network 8.8.8.8 0.0.0.0 area 0

network 192.1.28.8 0.0.0.0 area 0