Static Routing
Static routing is a concept describing one way of configuring path selection of routers in computer networks.
A router does not know anything about destinations that are NOT connected directly to a router (remote) by default.
Static routing is one way of teaching a router about remote networks or subnets.

There are pros and cons of using manual method. In complex scenarios (with redundant connections),
more often than not, we use dynamic routing protocols. But there are situations in which static routing is good or perhaps the best solution.

A static route is a manually configured route on your router. Static routes are typically used in smaller networks and when few networks or subnets exist, or with WAN links that have little available bandwidth. With a network that has hundreds of routes, static routes are not scalable, since you would have to configure each route and any redundant paths for that route on each router.

In this article I will demonstrate an example of static route configurations. We will use four different series router so you can get familiar with all different platform covered in CCNA exam.
Create a topology as shown in figure.


1841 Series Router0 (R1)
2621XM Series Router (R3)

FastEthernet0/0
Serial0/0/0

Fa0/0
Serial0/0/0
IP address
10.0.0.1
20.0.0.1
IP address
30.0.0.2
40.0.0.1
Connected With
Pc0
R2 on Serial 0/0
Connected With
FastEthernet0/0
R4 on Serial 0/0/0
2620XM Series Router(R2)
2811 Series Router0 (R4)

FastEthernet0/0
Serial0/0

FastEthernet0/0
Serial0/0/0
IP address
30.0.0.1
20.0.0.2
IP address
50.0.0.1
40.0.0.2
Connected With
R3 on Fa0/0
R1 on Serial 00/0
Connected With
Pc1
R3 on Serial 0/0
PC-PT PC0
PC-PT PC1

FastEthernet0
Default Gateway

FastEthernet0
Default Gateway
IP address
10.0.0.2
10.0.0.1
IP address
50.0.0.2
50.0.0.1
Connected With
R1 on FastEthernet0/0

Connected With
R4 on FastEthernet0/0


(1841Router0) Hostname R1
To configure and enable static routing on R1 follow these commands exactly.
Router>enable
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname R1
R1(config)#interface fastethernet 0/0
R1(config-if)#ip address 10.0.0.1 255.0.0.0
R1(config-if)#no shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R1(config-if)#exit
R1(config)#interface serial 0/0/0
R1(config-if)#ip address 20.0.0.1 255.0.0.0
R1(config-if)#clock rate 64000
R1(config-if)#bandwidth 64
R1(config-if)#no shutdown
%LINK-5-CHANGED: Interface Serial0/0/0, changed state to down
R1(config-if)#exit
%LINK-5-CHANGED: Interface Serial0/0/0, changed state to up
R1(config)#ip route 30.0.0.0 255.0.0.0 20.0.0.2
R1(config)#ip route 40.0.0.0 255.0.0.0 20.0.0.2
R1(config)#ip route 50.0.0.0 255.0.0.0 20.0.0.2
(2620XM-Router1) Hostname R2
To configure and enable static routing on R2 follow these commands exactly.
Router>enable
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname R2
R2(config)#interface serial 0/0
R2(config-if)#ip address 20.0.0.2 255.0.0.0
R2(config-if)#no shutdown
%LINK-5-CHANGED: Interface Serial0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
R2(config-if)#exit
R2(config)#interface fastethernet 0/0
R2(config-if)#ip address 30.0.0.1 255.0.0.0
R2(config-if)#no shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
R2(config-if)#exit
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R2(config)#ip route 10.0.0.0 255.0.0.0 20.0.0.1
R2(config)#ip route 40.0.0.0 255.0.0.0 30.0.0.2
R2(config)#ip route 50.0.0.0 255.0.0.0 30.0.0.2
(2620XM-Router2)Hostname R3
To configure and enable static routing on R3 follow these commands exactly.
Router>enable
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname R3
R3(config)#interface fastethernet 0/0
R3(config-if)#ip address 30.0.0.2 255.0.0.0
R3(config-if)#no shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R3(config-if)#interface serial 0/0
R3(config-if)#ip address 40.0.0.1 255.0.0.0
R3(config-if)#clock rate 64000
R3(config-if)#bandwidth 64
R3(config-if)#no shutdown
%LINK-5-CHANGED: Interface Serial0/0, changed state to down
R3(config-if)#exit
%LINK-5-CHANGED: Interface Serial0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
R3(config)#ip route 10.0.0.0 255.0.0.0 30.0.0.1
R3(config)#ip route 20.0.0.0 255.0.0.0 30.0.0.1
R3(config)#ip route 50.0.0.0 255.0.0.0 40.0.0.2
(2811Router3) Hostname R4
To configure and enable static routing on R4 follow these commands exactly.
Router>enable
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interface serial 0/0/0
Router(config-if)#ip address 40.0.0.2 255.0.0.0
Router(config-if)#no shutdown
%LINK-5-CHANGED: Interface Serial0/0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to up
Router(config-if)#exit
Router(config)#interface fastethernet 0/0
Router(config-if)#ip address 50.0.0.1 255.0.0.0
Router(config-if)#no shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
Router(config-if)#exit
Router(config)#ip route 10.0.0.0 255.0.0.0 40.0.0.1
Router(config)#ip route 20.0.0.0 255.0.0.0 40.0.0.1
Router(config)#ip route 30.0.0.0 255.0.0.0 40.0.0.1


PC:-
PC>ipconfig

IP Address......................: 10.0.0.2
Subnet Mask.....................: 255.0.0.0
Default Gateway.................: 10.0.0.1

PC>ping 50.0.0.2

Pinging 50.0.0.2 with 32 bytes of data:

Reply from 50.0.0.2: bytes=32 time=156ms TTL=124
Reply from 50.0.0.2: bytes=32 time=127ms TTL=124
Reply from 50.0.0.2: bytes=32 time=156ms TTL=124
Reply from 50.0.0.2: bytes=32 time=140ms TTL=124

Ping statistics for 50.0.0.2:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 127ms, Maximum = 156ms, Average = 144ms
PC>
PC-2
PC>ipconfig

IP Address......................: 50.0.0.2
Subnet Mask.....................: 255.0.0.0
Default Gateway.................: 50.0.0.1

PC>ping 10.0.0.2

Pinging 10.0.0.2 with 32 bytes of data:

Reply from 10.0.0.2: bytes=32 time=140ms TTL=124
Reply from 10.0.0.2: bytes=32 time=141ms TTL=124
Reply from 10.0.0.2: bytes=32 time=157ms TTL=124
Reply from 10.0.0.2: bytes=32 time=156ms TTL=124

Ping statistics for 10.0.0.2:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 140ms, Maximum = 157ms, Average = 148ms


Posted by S.S K Narendra Reddy at 5:21 AM 0 comments
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