Inter-AS VPN Option (10) A Notes
Inter-AS VPN Option (10) A
– Back-to-back VRF
-> The client’s routes are exhchanged by ASBRs by configuring each other as VRF clients
-> ASBR1 <–> ASBR2
-> This solution can have scalability issues as one layer 3 interface / VRF will be required on the ASBRs
-> The client routes are sent by the PE router to the ASBR router over VPNv4 neighbor connection
R1(config)# vrf definition ABC
rd 1:1
address-family ipv4 unicast
route-target both 1:1
int s0/0
vrf forwarding ABC
router eigrp 1
address-family ipv4 vrf ABC
network 14.0.0.1 0.0.0.0
redistribute bgp 100 metric 1 1 1 1 1
router bgp 100
no bgp default ipv4-unicast
neighbor 3.3.3.3 remote-as 100
neighbor 3.3.3.3 update-source lo0
address-family vpnv4 unicast
neighbor 3.3.3.3 activate
address-family ipv4 vrf ABC
redistribute eigrp 1
XR Router
R3(config)# vrf ABC
address-family ipv4 unicast
import route-target 1:1
export route-target 1:1
int s0/1
no ipv4 add
vrf ABC
ipv4 add <ip add>
router eigrp 1
vrf ABC
address-family ipv4 unicast
autonomous-system 1
int s0/1
redistribute bgp 100
default-metric 1 1 1 1 1
router bgp 100
address-family ipv4 unicast
address-family vpnv4 unicast
neighbor 1.1.1.1
remote-as 100
update-source lo0
address-family vpnv4 unicast
vrf ABC
rd 1:1
address-family ipv4 unicast
redistribute eigrp 1
Rinse and repeat for R5 and R7
! R1
router eigrp 1
eigrp router-id 1.1.1.1
network 1.1.1.1 0.0.0.0
network 12.0.0.1 0.0.0.0
! R2
mpls label protocol ldp
mpls ldp router-id lo0 force
int lo0
ip ospf 100 area 0
int e1/0
ip ospf 100 area 0
router ospf 100
router-id 2.2.2.2
mpls ldp autoconfig
!
vrf definition ABC
rd 1:1
address-family ipv4
route-target both 1:1
int e1/1
vrf forwarding ABC
ip address 12.0.0.2 255.255.255.0
!
router eigrp 1
eigrp router-id 2.2.2.2
address-family ipv4 vrf ABC
autonomous-system 1
network 12.0.0.2 0.0.0.0
!
router bgp 100
bgp router-id 2.2.2.2
no bgp default ipv4-unicast
neighbor 4.4.4.4 remote-as 100
neighbor 4.4.4.4 update-source lo0
address-family vpnv4
neighbor 4.4.4.4 activate
neighbor 4.4.4.4 send-community extended
!
router eigrp 1
address-family ipv4 vrf ABC
redistribute bgp 100 metric 1 1 1 1 1
router bgp 100
address-family ipv4 vrf ABC
redistribute eigrp 1
! R3
mpls ldp
router ospf 100
router-id 3.3.3.3
mpls ldp auto-config
area 0
int lo0
int gi0/0/0/0
int gi0/0/0/1
! R4
mpls ldp
router ospf 100
router-id 4.4.4.4
mpls ldp auto-config
area 0
int lo0
int gi0/0/0/0
!
vrf ABC
address-family ipv4 unicast
export route-target 1:1
import route-target 1:1
int gi0/0/0/1
no ipv4 address 45.0.0.4 255.255.255.0
vrf ABC
ipv4 address 45.0.0.4 255.255.255.0
router bgp 100
vrf ABC
rd 1:1
!
router bgp 100
bgp router-id 4.4.4.4
address-family vpnv4 unicast
neighbor 2.2.2.2
remote-as 100
update-source lo0
address-family vpnv4 unicast
!
router bgp 100
vrf ABC
address-family ipv4 unicast
redistribute eigrp 1
router eigrp 1
vrf ABC
address-family ipv4
default-metric 1 1 1 1 1
autonomous-system 1
redistribute bgp 100
int gi0/0/0/1
! R5
mpls ldp
router ospf 200
router-id 5.5.5.5
mpls ldp auto-config
area 0
int lo0
int gi0/0/0/0
!
vrf DEF
address-family ipv4 unicast
export route-target 2:2
import route-target 2:2
int gi0/0/0/1
no ipv4 address 45.0.0.5 255.255.255.0
vrf DEF
ipv4 address 45.0.0.5 255.255.255.0
router bgp 200
vrf DEF
rd 2:2
!
router bgp 200
bgp router-id 5.5.5.5
address-family vpnv4 unicast
neighbor 7.7.7.7
remote-as 200
update-source lo0
address-family vpnv4 unicast
!
router bgp 200
vrf DEF
address-family ipv4 unicast
redistribute eigrp 1
router eigrp 1
vrf DEF
address-family ipv4
default-metric 1 1 1 1 1
autonomous-system 1
redistribute bgp 200
int gi0/0/0/1
! R6
mpls label protocol ldp
mpls ldp router-id lo0 force
int lo0
ip ospf 200 area 0
int e1/0
ip ospf 200 area 0
int e1/1
ip ospf 200 area 0
router ospf 200
router-id 6.6.6.6
mpls ldp autoconfig
! R7
mpls label protocol ldp
mpls ldp router-id lo0 force
int lo0
ip ospf 200 area 0
int e1/0
ip ospf 200 area 0
router ospf 200
router-id 7.7.7.7
mpls ldp autoconfig
!
vrf definition DEF
rd 2:2
address-family ipv4
route-target both 2:2
int e1/1
vrf forwarding DEF
ip address 78.0.0.7 255.255.255.0
!
router eigrp 1
eigrp router-id 7.7.7.7
address-family ipv4 vrf DEF
autonomous-system 1
network 78.0.0.7 0.0.0.0
!
router bgp 200
bgp router-id 7.7.7.7
no bgp default ipv4-unicast
neighbor 5.5.5.5 remote-as 200
neighbor 5.5.5.5 update-source lo0
address-family vpnv4
neighbor 5.5.5.5 activate
neighbor 5.5.5.5 send-community extended
!
router eigrp 1
address-family ipv4 vrf DEF
redistribute bgp 200 metric 1 1 1 1 1
router bgp 200
address-family ipv4 vrf DEF
redistribute eigrp 1
! R8
router eigrp 1
address-family ipv4
router-id 8.8.8.8
int lo0
int gi0/0/0/0
Verification:
! R1
sh ip eigrp int
sh ip eigrp nei
sh ip route eigrp
ping 8.8.8.8
! R2 and R7
sh ip ospf int bri
sh ip ospf nei
sh ip route ospf
sh mpls int
sh mpls ldp nei
sh mpls ldp dis
sh bgp vpnv4 u all sum
sh vrf detail
sh vrf DEF
sh ip eigrp vrf DEF int
sh ip eigrp vrf DEF nei
sh ip route vrf DEF eigrp
sh bgp vrf DEF
sh ip route vrf DEF bgp
sh ip eigrp vrf DEF topology
sh bgp vpnv4 u all
sh bgp vpnv4 u all labels
sh mpls forwarding
! R3
sh ospf int bri
sh ospf nei
sh route ospf
sh mpls int
sh mpls ldp nei bri
sh mpls ldp dis
! R4
sh ospf int bri
sh ospf nei
sh mpls int
sh mpls ldp nei bri
sh mpls ldp dis
sh bgp vpnv4 u sum
sh vrf ABC
sh vrf ABC detail
sh ip vrf ABC int bri
sh eigrp vrf ABC int
sh eigrp vrf ABC nei
sh route vrf ABC eigrp
sh bgp vrf ABC
sh route vrf ABC bgp
sh eigrp vrf ABC topology
sh mpls forwarding
sh bgp vpnv4 u
sh bgp vpnv4 u labels
! R5
sh ospf int bri
sh ospf nei
sh mpls int
sh mpls ldp nei bri
sh mpls ldp dis
sh bgp vpnv4 u sum
sh bgp vpnv4 u
sh vrf DEF
sh vrf DEF detail
sh ip vrf DEF int bri
sh eigrp vrf DEF int
sh eigrp vrf DEF nei
sh route vrf DEF eigrp
sh bgp vrf DEF
sh route vrf DEF bgp
sh eigrp vrf DEF topology
sh mpls forwarding
sh bgp vpnv4 u
sh bgp vpnv4 u labels
! R6
sh ip ospf int bri
sh ip ospf nei
sh ip route ospf
sh mpls int
sh mpls ldp nei
sh mpls ldp dis
! R8
sh eigrp int
sh eigrp nei
sh route eigrp
ping 1.1.1.1
