R31#sh run
Building configuration...

Current configuration : 3388 bytes
!
! Last configuration change at 18:22:57 UTC Tue Oct 19 2021
!
version 15.9
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R31
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
!
!
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
!
!
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
!
redundancy
!
!
interface Loopback0
 ip address 10.3.3.3 255.255.255.0
!
interface Tunnel100
 ip address 192.168.100.31 255.255.255.0
 tunnel source GigabitEthernet0/2
 tunnel destination 172.16.11.1
!
interface GigabitEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/2
 ip address 172.16.31.1 255.255.255.0
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/3
 no ip address
 shutdown
 duplex auto
 speed auto
 media-type rj45
!
!
router eigrp GRE
 !
 address-family ipv4 unicast autonomous-system 100
  !
  topology base
  exit-af-topology
  network 10.3.3.0 0.0.0.255
  network 192.168.100.0
 exit-address-family
!
router ospf 1
 network 10.3.3.3 0.0.0.0 area 0
 network 172.16.31.1 0.0.0.0 area 0
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ip forward-protocol nd
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no ip http server
no ip http secure-server
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ipv6 ioam timestamp
!
!
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control-plane
!
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line con 0
line aux 0
line vty 0 4
 login
 transport input none
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no scheduler allocate
!
end