frr version 9.1
frr defaults traditional
hostname uk-lon-core-01
log syslog informational

interface lo
 ip address 10.255.0.3/32

interface eth0
 ip ospf area 0
 ip ospf hello-interval 5
 ip ospf dead-interval 20

router ospf
 ospf router-id 10.255.0.3
 passive-interface lo

router bgp 65003
 bgp router-id 10.200.0.13
 bgp log-neighbor-changes
 no bgp ebgp-requires-policy
 neighbor 10.200.0.11 remote-as 65001
 neighbor 10.200.0.11 description de-fra-core-01
 neighbor 10.200.0.11 timers 10 30
 neighbor 10.200.0.14 remote-as 65004
 neighbor 10.200.0.14 description nl-ams-core-01
 neighbor 10.200.0.14 timers 10 30
 neighbor 10.200.0.15 remote-as 65005
 neighbor 10.200.0.15 description us-nyc-core-01
 neighbor 10.200.0.15 timers 10 30
 neighbor 10.200.0.22 remote-as 65007
 neighbor 10.200.0.22 description uk-lon-edge-01
 neighbor 10.200.0.22 timers 10 30
 neighbor 10.200.0.31 remote-as 65010
 neighbor 10.200.0.31 description uk-lon-dist-01
 neighbor 10.200.0.31 timers 10 30
 !
 address-family ipv4 unicast
  network 10.20.1.0/24
  network 10.255.0.3/32
  neighbor 10.200.0.11 activate
  neighbor 10.200.0.11 soft-reconfiguration inbound
  neighbor 10.200.0.14 activate
  neighbor 10.200.0.14 soft-reconfiguration inbound
  neighbor 10.200.0.15 activate
  neighbor 10.200.0.15 soft-reconfiguration inbound
  neighbor 10.200.0.22 activate
  neighbor 10.200.0.22 soft-reconfiguration inbound
  neighbor 10.200.0.31 activate
  neighbor 10.200.0.31 soft-reconfiguration inbound
 exit-address-family

ip route 10.20.1.0/24 Null0

line vty
