@ SW1

en
conf t
hostname SW1
no ip domain-lookup
enable secret cisco
!
line con 0
 logg syn 
 exec-timeout 0 0
!
line vty 0 15
 password ciscovty
 login
!
int vlan 1
 ip address 192.168.100.1 255.255.255.0
 no shutdown
!
ip default-gateway 192.168.100.254
end

@ SW2

en
conf t
hostname SW2
no ip domain-lookup
enable secret cisco
!
line con 0
 logg syn 
 exec-timeout 0 0
!
line vty 0 15
 password ciscovty
 login
!
int vlan 1
 ip address 192.168.100.2 255.255.255.0
 no shutdown
!
ip default-gateway 192.168.100.254

@ SW3

en
conf t
hostname SW3
no ip domain-lookup
enable secret cisco
!
line con 0
 logg syn 
 exec-timeout 0 0
!
line vty 0 15
 password ciscovty
 login
!
int vlan 1
 ip address 192.168.100.3 255.255.255.0
 no shutdown
!
ip default-gateway 192.168.100.254

@ R1

en
conf t
hostname R1
no ip domain-lookup
enable secret cisco
!
line con 0
 logg syn 
 exec-timeout 0 0
!
line vty 0 4
 password ciscovty
 login
 end