Steps to Configure Site to Site VPN

R1(config)#crypto isakmp enable
R1(config)#crypto isakmp policy 1
R1(config-isakmp)#authentication pre-share 
R1(config-isakmp)#encryption aes
R1(config-isakmp)#hash sha
R1(config-isakmp)#group 2
R1(config-isakmp)#exit
R1(config)#crypto isakmp key 0 address 10.0.0.1 0.0.0.0
R1(config)#crypto ipsec transform-set yasser esp-aes esp-sha-hmac 
R1(config)#crypto ipsec security-association lifetime seconds 86400
R1(config)#ip access-list extended ramzy
R1(config-ext-nacl)#permit ip 172.16.0.0 0.0.255.255 192.168.10.0 0.0.0.255
R1(config-ext-nacl)#exit
R1(config)#