! spine
interface r2-eth0
 ip address 192.168.255.1/30
!
interface r2-eth1
 ip address 192.168.254.1/30
!
interface r2-eth2
 ip address 192.168.253.1/30
!
interface r2-eth3
 ip address 192.168.252.1/30
 vrf vrf1
!
auto vrf1
iface vrf1
  vrf-table auto
!
ip forwarding
!