log stdout
mpls label dynamic-block 5000 5999
interface lo
 ip address 192.0.2.5/32
!
interface r5-eth0
 ip address 172.31.12.5/24
!
interface r5-eth1
 ip address 172.31.4.5/24
 mpls enable
!
interface r5-eth2
 ip address 172.31.7.5/24
 mpls enable
!
interface r5-eth3
 ip address 172.31.21.5/24
!