interface Loopback0
 ipv4 address 10.255.255.26/32

interface Gig0/0/0/1
 ipv4 address 10.4.26.26/24
 no shutdown

interface Gig0/0/0/2
 ipv4 address 10.10.26.26/24
 no shutdown

interface Gig0/0/0/3
 ipv4 address 10.3.26.26/24
 no shutdown

interface Gig0/0/0/4
 ipv4 address 10.9.26.26/24
 no shutdown
 exit

router ospf 1000
 log adjacency changes detail
 router-id 10.255.255.26
 mpls ldp auto-config
 prefix-suppression
 auto-cost reference-bandwidth 1000
 address-family ipv4
 area 0
  interface Loopback0
  passive enable
  exit
 interface GigabitEthernet0/0/0/2
  network point-to-point
  exit
 interface GigabitEthernet0/0/0/4
  network point-to-point
  exit
 exit
exit

router isis CORE
 is-type level-2-only
 net 49.0000.0000.0000.0026.00
 log adjacency changes
 address-family ipv4 unicast
  metric-style wide
  advertise passive-only
  mpls ldp auto-config
  exit
 interface Loopback0
  passive
  address-family ipv4 unicast
  tag 1
  exit
 exit
 interface GigabitEthernet0/0/0/1
  point-to-point
  address-family ipv4 unicast
  metric 1000
  exit
 exit
 interface GigabitEthernet0/0/0/3
  point-to-point
  address-family ipv4 unicast
  metric 1000
  exit
 exit
exit

mpls ldp
 log
  neighbor
  exit
 router-id 10.255.255.26
 exit
 mpls label range table 0 26000 26999
 commit
exit