log stdout
interface lo
 ip address 192.0.2.4/32
!
interface r4-eth0
 ip address 172.31.2.4/24
 mpls enable
!
interface r4-eth1
 ip address 172.31.6.4/24
 mpls enable
!
interface r4-eth2
 ip address 172.31.7.4/24
 mpls enable
!
interface r4-eth3
 mpls enable
!