frr defaults traditional
hostname r4
! AS 64604: proveedor de r1 y cliente de r6.
interface lo
 ip address 100.64.4.1/32
interface eth1
 description hacia r1 (cliente)
 ip address 100.64.4.129/30
interface eth2
 description hacia r6 (proveedor)
 ip address 100.64.6.130/30
ip route 100.64.4.0/24 Null0
router bgp 64604
 bgp router-id 100.64.4.1
 no bgp ebgp-requires-policy
 neighbor 100.64.4.130 remote-as 64601
 neighbor 100.64.6.129 remote-as 64606
 address-family ipv4 unicast
  network 100.64.4.0/24
 exit-address-family