en 
conf t

line con 0
 exec-timeout 0 0
 logging synchronous

hostname 2nd_bb

interface Loopback11
 ip address 172.31.20.100 255.255.255.0

interface Loopback12
 ip address 172.31.21.100 255.255.255.0

interface Serial0/0
 ip address 172.22.1.100 255.255.255.0
 no shut

interface Serial 0/1
 ip address 172.22.2.100 255.255.255.0
 no shut

interface Serial 0/2
 ip address 172.22.3.100 255.255.255.0
 no shut

interface Serial 0/3
 ip address 172.22.4.100 255.255.255.0
 no shut

router bgp 65201
 no synchronization
 network 172.31.20.0 mask 255.255.255.0
 network 172.31.21.0 mask 255.255.255.0
 network 172.22.1.0 mask 255.255.255.0
 network 172.22.2.0 mask 255.255.255.0
 network 172.22.3.0 mask 255.255.255.0
 network 172.22.4.0 mask 255.255.255.0

 neighbor 172.22.1.1 remote-as 65101
 neighbor 172.22.2.2 remote-as 65102
 neighbor 172.22.3.3 remote-as 65103
 neighbor 172.22.4.4 remote-as 65104


end

copy run start