Networking

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HOW TO CONFIGURE THE GRE TUNNEL ON CISCO ROUTER  WITH OSPF PROTOCOL


1.check the diagram and follow the steps as mention below .

Router 1 in that execute  this command 

R1#

conf t

interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Tunnel10
 ip address 172.16.1.1 255.255.255.252
 tunnel source Loopback0
 tunnel destination 3.3.3.3

no shut

!
interface FastEthernet0/0
 ip address 20.1.1.1 255.255.255.252
 duplex auto
 speed auto

no shut
!
interface FastEthernet0/1
 ip address 10.1.1.1 255.255.255.252
 duplex auto
 speed auto

no shut
!
router ospf 1
 log-adjacency-changes
 network 1.1.1.0 0.0.0.255 area 100
 network 2.2.2.0 0.0.0.255 area 100
 network 3.3.3.0 0.0.0.255 area 100
 network 10.1.1.0 0.0.0.255 area 100
 network 20.1.1.0 0.0.0.255 area 100
 network 30.1.1.0 0.0.0.255 area 100
 network 40.1.1.0 0.0.0.255 area 100

Router 2  execute this below commands 

R2#

conf t 

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
 ip address 20.1.1.2 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 30.1.1.1 255.255.255.252
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 1.1.1.0 0.0.0.255 area 100
 network 2.2.2.0 0.0.0.255 area 100
 network 3.3.3.0 0.0.0.255 area 100
 network 10.1.1.0 0.0.0.255 area 100
 network 20.1.1.0 0.0.0.255 area 100
 network 30.1.1.0 0.0.0.255 area 100
 network 40.1.1.0 0.0.0.255 area 100

R3#

Router 3

execute this below command
 

conf t

interface Tunnel10
 ip address 172.16.1.2 255.255.255.252
 tunnel source Loopback0
 tunnel destination 1.1.1.1
!
interface FastEthernet0/0
 ip address 40.1.1.1 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 30.1.1.2 255.255.255.252
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 1.1.1.0 0.0.0.255 area 100
 network 2.2.2.0 0.0.0.255 area 100
 network 3.3.3.0 0.0.0.255 area 100
 network 10.1.1.0 0.0.0.255 area 100
 network 20.1.1.0 0.0.0.255 area 100
 network 30.1.1.0 0.0.0.255 area 100
 network 40.1.1.0 0.0.0.255 area 100

verify the tunnel 10 through traceroute command

R1#traceroute 172.16.1.2

Type escape sequence to abort.
Tracing the route to 172.16.1.2

  1 172.16.1.2 92 msec 64 msec 48 msec


R3#traceroute 172.16.1.1

Type escape sequence to abort.
Tracing the route to 172.16.1.1

  1 172.16.1.1 100 msec 72 msec 60 msec


****************finished************