en
conf t

hostname 2nd_bb

no ip domain-lookup

line con 0
 exec-timeout 0 0
 logging synchronous


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
 description Connected to p1r3 on s1
 ip address 172.22.1.100 255.255.255.0
 no shut

interface Serial0/1
 ip address 172.22.2.100 255.255.255.0
 no shut

interface Serial0/2
 ip address 172.22.3.100 255.255.255.0
 no shut

interface Serial0/3
 ip address 172.22.4.100 255.255.255.0
 no shut

router bgp 65201
 no synchronization
 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
 network 172.31.20.0 mask 255.255.255.0
 network 172.31.21.0 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