Feral Packet

Inter-AS VPN Option (10) C

– Multihop MP-BGP

– VPNv4 neighbor relationship between PE routers or router reflectors

     -> Must be able to ping each others loopback interfaces

PE Routers | Route Reflectors should be able to ping loopback to loopback (IPv4)

 – Control Plane

     -> PE – ASBR

          -> iBGP IPv4

     -> ASBR – ASBR

          -> eBGP IPv4

     -> Advertise loopback into BGP

          -> On PE router

 – Data Plane

     -> On XR routers, static routes are needed on the ASBR routers for the transport labels

 – VPNv4 neighbor relationship between R1 and R7 will use loopbacks

     -> 1.1.1.1

     -> 7.7.7.7

     -> Labels must be associated with the next-hop address

          -> 1.1.1.1, 7.7.7.7

 – PE – PE communications

     -> Labels

          -> iBPG / eBGP + IPv4

 – CE – CE communications

     -> Labels

          -> eBGP VPNv4 

          -> PE routers

Configuration

 1. IPv4 – iBGP + label between PE – ASBR

 2. IPv4 – eBGP + label between ASBRs

     -> Configure next-hop-self on both ASBRs towards the PE routers

 3. Static route for each other on ASBRs

     -> XR routes only

 4. MP-eBGP VPNv4 neighbors between PE routers | Router Reflectors loopback to loopback

     -> Multihop

 5. PE – CE VRF and IGP configuration

 6. Mutual redistribution between VRF IGP and VRF BGP

Option C with Router Reflectors

 1. MP-eBGP VPNv4 is configured between Router Reflectors

 2. MP-iBGP VPNv4 between Router Reflector and PE routers

 3. IPv4 – eBGP + label between ASBRs

 4. IPv4 – iBGP between ASBR – RR – PE routers

 5. Loopback addresses of PE routers and Route Reflectors are exchanged

 6. PE – CE stuff

! R1

router bgp 50

 bgp router-id 1.1.1.1

 no bgp default ipv4-unicast

 neighbor 12.0.0.1 remote-as 100

 address-family ipv4

  network 1.1.1.1 mask 255.255.255.255

  neighbor 12.0.0.1 activate

! R2

mpls label protocol ldp

mpls ldp router-id lo0 force

int lo0

 ip ospf 1 area 0

int e1/0

 ip ospf 1 area 0

router ospf 1

 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 bgp 100

 bgp router-id 2.2.2.2

 no bgp default ipv4-unicast

 address-family ipv4 vrf ABC

  neighbor 12.0.0.1 remote-as 50

  neighbor 12.0.0.1 activate

  neighbor 12.0.0.1 as-override

  redistribute connected

!

router bgp 100

 neighbor 4.4.4.4 remote-as 100

 neighbor 4.4.4.4 update-source lo0

 address-family ipv4

  network 2.2.2.2 mask 255.255.255.255

  neighbor 4.4.4.4 activate

  neighbor 4.4.4.4 send-label

!

router bgp 100

 neighbor 7.7.7.7 remote-as 200

 neighbor 7.7.7.7 update-source lo0

 neighbor 7.7.7.7 ebgp-multihop 255

 address-family vpnv4

  neighbor 7.7.7.7 activate

  neighbor 7.7.7.7 send-community extended

vrf definition ABC

 address-family ipv4

  route-target import 2:2

! R3

mpls ldp

router ospf 1

 router-id 9.9.0.3

 mpls ldp auto-config

 area 0

  int lo0

  int gi0/0/0/0

  int gi0/0/0/1

! R4

mpls ldp

router ospf 1

 router-id 4.4.4.4

 mpls ldp auto-config

 area 0

  int lo0

  int gi0/0/0/0

!

router bgp 100

 bgp router-id 4.4.4.4

 address-family ipv4 unicast

  allocate-label all

 neighbor 45.0.0.5

  remote-as 200

  address-family ipv4 labeled-unicast

   route-policy allow-all in

   route-policy allow-all out

route-policy allow-all

 pass

 exit

router static

 address-family ipv4 unicast

  45.0.0.5/32 gi0/0/0/1

!

router bgp 100

 neighbor 2.2.2.2

  remote-as 100

  update-source lo0

  address-family ipv4 labeled-unicast

   next-hop-self

! R5

mpls ldp

router ospf 1

 router-id 5.5.5.5

 mpls ldp auto-config

 area 0

  int lo0

  int gi0/0/0/0

!

router bgp 200

 bgp router-id 5.5.5.5

 address-family ipv4 unicast

  allocate-label all

 neighbor 45.0.0.4

  remote-as 100

  address-family ipv4 labeled-unicast

   route-policy allow-all in

   route-policy allow-all out

route-policy allow-all

 pass

 exit

router static

 address-family ipv4 unicast

  45.0.0.4/32 gi0/0/0/1

!

router bgp 200

 neighbor 7.7.7.7

  remote-as 200

  update-source lo0

  address-family ipv4 labeled-unicast

   next-hop-self

 

! R6

mpls label protocol ldp

mpls ldp router-id lo0 force

int lo0

 ip ospf 1 area 0

int e1/0

 ip ospf 1 area 0

int e1/1

 ip ospf 1 area 0

router ospf 1

 router-id 6.6.6.6

 mpls ldp autoconfig

! R7

mpls label protocol ldp

mpls ldp router-id lo0 force

int lo0

 ip ospf 1 area 0

int e1/0

 ip ospf 1 area 0

router ospf 1

 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 bgp 200

 bgp router-id 7.7.7.7

 no bgp default ipv4-unicast

 address-family ipv4 vrf DEF

  neighbor 78.0.0.8 remote-as 50

  neighbor 78.0.0.8 activate

  neighbor 78.0.0.8 as-override

  redistribute connected

!

router bgp 200

 neighbor 5.5.5.5 remote-as 200

 neighbor 5.5.5.5 update-source lo0

 address-family ipv4

  network 7.7.7.7 mask 255.255.255.255

  neighbor 5.5.5.5 activate

  neighbor 5.5.5.5 send-label

!

router bgp 200

 neighbor 2.2.2.2 remote-as 100

 neighbor 2.2.2.2 update-source lo0

 neighbor 2.2.2.2 ebgp-multihop 255

 address-family vpnv4

  neighbor 2.2.2.2 activate

  neighbor 2.2.2.2 send-community extended

vrf definition DEF

 address-family ipv4

  route-target import 1:1

! R8

router bgp 50

 bgp router-id 8.8.8.8

 address-family ipv4 unicast

  network 8.8.8.8/32

 neighbor 78.0.0.7

  remote-as 200

  address-family ipv4 unicast

   route-policy allow-all in

   route-policy allow-all out

route-policy allow-all

 pass

 end

Verification:

! R1

sh bgp sum

sh bgp

sh ip route bgp

ping 8.8.8.8 source lo0

! R2

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 vrf detail

sh bgp vrf ABC all sum

sh bgp vrf ABC all

sh bgp sum

sh bgp

sh bgp vpnv4 u all sum

sh bgp vpnv4 u all

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 route ospf

sh mpls int

sh mpls ldp nei bri

sh mpls ldp dis

sh bgp ipv4 labeled-unicast sum

sh bgp ipv4 labeled-unicast

sh mpls forwarding

! R5

sh ospf int bri

sh ospf nei

sh route ospf

sh mpls int

sh mpls ldp nei bri

sh mpls ldp dis

sh bgp ipv4 labeled-unicast sum

sh bgp ipv4 labeled-unicast

sh mpls forwarding

! 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

! 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 vrf detail

sh bgp vrf DEF all sum

sh bgp vrf DEF all

sh bgp sum

sh bgp

sh bgp vpnv4 u all sum

sh bgp vpnv4 u all

sh mpls forwarding

! R8

sh bgp sum

sh bgp

sh ip route bgp

ping 1.1.1.1 source 8.8.8.8