Cumulus OSPF

################################ /etc/network/interfaces R1 #####################################

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*.intf

# The loopback network interface
auto lo
  iface lo inet loopback
  address 10.2.1.1/32

# The primary network interface
auto eth0
  iface eth0 inet dhcp

#Link to C2-1
auto swp1
  iface swp1
  address 10.2.1.1/32

#Link to C2-2
auto swp2
  iface swp2
  address 10.2.2.1/32

#Link to client
auto swp3
  iface swp3
  address 10.4.1.1/24


#The hostonly interface
auto swp9
  iface swp9 inet dhcp

################################ /etc/network/interfaces R2 ####################################

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*.intf

# The loopback network interface
auto lo
  iface lo inet loopback
  address 10.2.1.2/32

# The primary network interface
auto eth0
  iface eth0 inet dhcp

#Link to C2-1
auto swp1
  iface swp1
  address 10.2.1.2/32

#Link to C2-2
auto swp2
  iface swp2
  address 10.2.2.2/32

#Link to client
auto swp3
  iface swp3
  address 10.4.2.1/24


#The hostonly interface
auto swp9
  iface swp9 inet dhcp

################################ /etc/frr/frr.conf R1 ####################################
service integrated-vtysh-config

interface swp1
  ip ospf network point-to-point

interface swp2
  ip ospf network point-to-point

router-id 10.2.1.1

router ospf
  ospf router-id 10.2.1.1
  network 10.2.1.0/32 area 0.0.0.0
  network 10.2.2.0/32 area 0.0.0.0
  network 10.4.1.0/24 area 0.0.0.0

################################ /etc/frr/frr.conf R2 ####################################
service integrated-vtysh-config

interface swp1
  ip ospf network point-to-point

interface swp2
  ip ospf network point-to-point

router-id 10.2.1.2

router ospf
  ospf router-id 10.2.1.2
  network 10.2.1.0/32 area 0.0.0.0
  network 10.2.2.0/32 area 0.0.0.0
  network 10.4.2.0/24 area 0.0.0.0