frr defaults traditional
hostname x
! AS 65200: se conecta al AS 65100 en sus dos extremos.
interface lo
 ip address 100.64.120.1/32
interface eth1
 description hacia b1
 ip address 10.207.1.2/30
interface eth2
 description hacia b4
 ip address 10.207.4.2/30
ip route 100.64.120.0/24 Null0
router bgp 65200
 bgp router-id 100.64.120.1
 no bgp ebgp-requires-policy
 neighbor 10.207.1.1 remote-as 65100
 neighbor 10.207.4.1 remote-as 65100
 address-family ipv4 unicast
  network 100.64.120.0/24
 exit-address-family