Experimental Topology

Basic configuration

R1
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip a 192.168.1.1 24
[r1-GigabitEthernet0/0/0]q
[r1]int s 4/0/0
[r1-Serial4/0/0]ip a 15.1.1.2 24
[r1-Serial4/0/0]q
[r1]ip route-static 0.0.0.0 0 15.1.1.1
R2
[r2]int g 0/0/0
[r2-GigabitEthernet0/0/0]ip a 192.168.2.1 24
[r2-GigabitEthernet0/0/0]q
[r2]int s 4/0/0
[r2-Serial4/0/0]ip a 25.1.1.2 24
[r2-Serial4/0/0]q
[r2]ip route-static 0.0.0.0 0 25.1.1.1
R3
[r3]int g 0/0/0
[r3-GigabitEthernet0/0/0]ip a 192.168.3.1 24
[r3-GigabitEthernet0/0/0]q
[r3]int s 4/0/0
[r3-Serial4/0/0]ip a 35.1.1.2 24
[r3-Serial4/0/0]q
[r3]ip route-static 0.0.0.0 0 35.1.1.1 
R4
[r4]int g 0/0/1
[r4-GigabitEthernet0/0/1]ip a 192.168.4.1 24
[r4-GigabitEthernet0/0/1]q
[r4]int g 0/0/0
[r4-GigabitEthernet0/0/0]ip a 45.1.1.2 24
[r4-GigabitEthernet0/0/0]q
[r4]ip route-static 0.0.0.0 0 45.1.1.1 
R5
[r5]int g 0/0/0
[r5-GigabitEthernet0/0/0]ip a 45.1.1.1 24
[r5-GigabitEthernet0/0/0]q
[r5]int s 4/0/0
[r5-Serial4/0/0]ip a 35.1.1.1 24
[r5-Serial4/0/0]q
[r5]int s 3/0/1
[r5-Serial3/0/1]ip a 25.1.1.1 24
[r5]int  s 3/0/0
[r5-Serial3/0/0]ip a 15.1.1.1 24
[r5-Serial3/0/0]q
[r5]int lo0
[r5-LoopBack0]ip a 5.5.5.5 24
[r5-LoopBack0]q

R1,R5 Between PAP authentication

R5
[r5]aaa	
[r5-aaa]local-user admin1 password cipher 123456
[r5-aaa]local-user admin1 service-type ppp
[r5-aaa]q
[r5]int s 3/0/0
[r5-Serial3/0/0]ppp authentication-mode pap
[r5-Serial3/0/0]q
R1
[r1]int s 4/0/0
[r1-Serial4/0/0]ppp pap local-user admin1 password cipher 123456
[r1-Serial4/0/0]q

R2,R5 Between EHAP authentication

R5
[r5]aaa
[r5-aaa]local-user admin2 password cipher 121212	
[r5-aaa]local-user admin2 service-type ppp
[r5-aaa]q
[r5]int s 3/0/1
[r5-Serial3/0/1]ppp authentication-mode chap
[r5-Serial3/0/1]q
R2
[r2]int s 4/0/0
[r2-Serial4/0/0]ppp chap user admin2
[r2-Serial4/0/0]ppp chap password cipher 121212
[r2-Serial4/0/0]q

R3 And R5 Between HDLC encapsulation

R3
[r3]int s 4/0/0
[r3-Serial4/0/0]link-protocol hdlc
R5
[r5]int s 4/0/0
[r5-Serial4/0/0]link-protocol hdlc

R1,R2,R3 Between MGRE

R1
[r1]int tunnel 0/0/0
[r1-Tunnel0/0/0]ip a 10.1.1.1 24
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp
[r1-Tunnel0/0/0]source 15.1.1.1
[r1-Tunnel0/0/0]nhrp network-id 100
[r1-Tunnel0/0/0]nhrp entry multicast dynamic
[r1-Tunnel0/0/0]undo rip split-horizon
R2
[r2]int tunnel 0/0/0
[r2-Tunnel0/0/0]ip a 10.1.1.2 24
[r2-Tunnel0/0/0]tunnel-protocol gre p2mp
[r2-Tunnel0/0/0]source Serial 4/0/0
[r2-Tunnel0/0/0]nhrp entry 25.1.1.2 10.1.1.2 register
R3
[r3]int tunnel 0/0/0
[r3-Tunnel4/0/0]ip a 10.1.1.3 24
[r3-Tunnel0/0/0]tunnel-protocol gre p2mp
[r3-Tunnel0/0/0]source Serial 4/0/0
[r3-Tunnel0/0/0]nhrp entry 35.1.1.2 10.1.1.3 register

R1,R4 Between GRE

R1
[r1]interface tunnel 0/0/1
[r1-Tunnel0/0/1]ip address 10.1.2.1 24
[r1-Tunnel0/0/1]tunnel-protocol gre
[r1-Tunnel0/0/1]source 15.1.1.2
[r1-Tunnel0/0/0]destination 45.1.1.2
R4
[r4]int tunnel 0/0/1
[r4-Tunnel4/0/0]ip a 10.1.2.2 24
[r4-Tunnel0/0/0]tunnel-protocol gre
[r4-Tunnel0/0/0]source 45.1.1.2
[r4-Tunnel0/0/0]destination 15.1.1.2

RIP To configure

RIP To configure 
R1
[r1]rip
[r1-rip-1]ver 2
[r1-rip-1]network 192.168.1.0 
[r1-rip-1]network 10.0.0.0
[r1-rip-1]network 15.0.0.0
R2
[r2]rip 
[r2-rip-1]ver 2
[r2-rip-1]network 25.0.0.0
[r2-rip-1]network 10.0.0.0
[r2-rip-1]network 192.168.2.0
R3
[r3]rip 
[r3-rip-1]ver 2
[r3-rip-1]network 192.168.3.0
[r3-rip-1]network 10.0.0.0
[r3-rip-1]network 35.0.0.0
R4
[r4]rip 
[r4-rip-1]ver 2
[r4-rip-1]net	
[r4-rip-1]network 192.168.4.0
[r4-rip-1]network 10.0.0.0
[r4-rip-1]network 45.0.0.0

test