GRE without Authentication

R1 Configuration !!!!!!!!!!!

R1#configure terminal
R1(config)#interface fastEthernet 1/1
R1(config-if)#ip address 192.168.1.254 255.255.255.0
R1(config-if)#no shu
R1(config-if)#do write me

Frame-Relay Multipoint with Sub-interface

R1 Configuration!!!!!!
!
interface GigabitEthernet0/0
 ip address 192.168.1.1 255.255.255.0
!

Frame-Relay ( Router As A Frame-Relay)

R1 Configuration!!!!!!
!
interface FastEthernet0/0
 ip address 192.168.1.1 255.255.255.0
!

Hot Standby Router Protocol (HSRP)

 R1 Configuration !!!!

interface FastEthernet0/0
 ip address 200.200.200.2 255.255.255.252

OSPF Authentication

R1 Configuration !!!!!

R1#
R2#configure terminal
R1(config)#interface GigabitEthernet 0/0
R1(config-if)#ip address 192.168.0.254 255.255.255.0
R1(config-if)#no shutdown