05.Static Routing Lab

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The Bryant Advantage Ultimate CCNA Lab Workbook

Chris Bryant, CCIE #12933 - www.thebryantadvantage.com Back To Index

Static Routing Lab

You will need to have the Frame Relay lab up and running before starting

this lab.

We'll use the same topology you saw in the Static Routing chapter topractice commands.

Create a static route on R3 and one on R1 that will allow R3 tosuccessfully ping R2’s loopback interface, 2.2.2.2. The route should only

consider traffic destined for 2.2.2.2. Use show ip route to display thestatic routes.

R3#conf t

R3(config)#ip route 2.2.2.2 255.255.255.255 172.12.123.1

R3#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate

default

U - per-user static route, o - ODR

Gateway of last resort is not set

2.0.0.0/32 is subnetted, 1 subnets

S 2.2.2.2 [1/0] via 172.12.123.1


C 3.3.3.0 is directly connected, Loopback0


C 172.12.13.0 is directly connected, Serial1

C 172.12.123.0 is directly connected, Serial0.31


C 172.23.23.0 is directly connected, Ethernet0

R1#conf t

R1(config)#ip route 2.2.2.2 255.255.255.255 172.12.123.2

R1#show ip route

< codes deleted for clarity >

Gateway of last resort is not set




S 2.2.2.2 [1/0] via 172.12.123.2

172.12.0.0/16 is variably subnetted, 3 subnets, 2 masks

C 172.12.13.0/24 is directly connected, Serial1


Examining the syntax of the “ip route” commands used in this lab:



R3(config)#ip route 2.2.2.2 255.255.255.255 172.12.123.1

“ip route”: The command. 2.2.2.2 : The destination address.255.255.255.255: The wildcard mask. This particular mask means that

only traffic destined for 2.2.2.2 will use this static route.172.12.123.1: The next-hop IP address used to reach the destination.

R1(config)#ip route 2.2.2.2 255.255.255.255 172.12.123.2

“ip route”: The command. 2.2.2.2: The destination address.255.255.255.255. The wildcard mask. Again, only traffic destined for 2.2.2.2 will use this static route.172.12.123.2: The next-hop IP address used to reach this destination.

On R3, run debug ip packet , then ping 2.2.2.2. The pings will returnsuccessfully, and the packets can be seen leaving and entering the router.Turn all debugs off with undebug all .

R3#debug ip packet

IP packet debugging is on

R3#ping 2.2.2.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:

!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 132/136/144 m

R3#

IP: s=172.12.123.3 (local), d=2.2.2.2 (Serial0.31), len 100, sending

IP: s=2.2.2.2 (Serial0.31), d=172.12.123.3 (Serial0.31), len 100, rcvd 3









R3#undebug all

All possible debugging has been turned off

Remove the static routes with the command no ip route. Replace themwith a static route with a destination and subnet mask of 0.0.0.0. Thisroute will serve as a default route; to verify this, run show ip route after configuring these default static routes.

Notice that with static routes, you can configure either a next-hop IPaddress or an exit interface on the end of the static route command.Here, you’ll configure both.

R3#conf t

R3(config)#no ip route 2.2.2.2 255.255.255.255 172.12.123.1

R3(config)#ip route 0.0.0.0 0.0.0.0 serial0.31

R1#conf t



R1(config)#no ip route 2.2.2.2 255.255.255.255 172.12.123.2

R1(config)#ip route 0.0.0.0 0.0.0.0 172.12.123.2

A static route configured with a destination and subnet mask of 0.0.0.0 willserve as a default route.

R3#show ip route

Gateway of last resort is 0.0.0.0 to network 0.0.0.0




C 172.12.13.0 is directly connected, Serial1

C 172.12.123.0 is directly connected, Serial0.31


C 172.23.23.0 is directly connected, Ethernet0

S* 0.0.0.0/0 is directly connected, Serial0.31

The static route appears on R3 as a candidate default route, and is thenused as the default route. The gateway of last resort is now set to0.0.0.0. This is a result of using an exit interface to configure the static

default route, rather than a next-hop IP address.

R1#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate

default

Gateway of last resort is 172.12.123.2 to network 0.0.0.0



172.12.0.0/16 is variably subnetted, 3 subnets, 2 masks



S* 0.0.0.0/0 [1/0] via 172.12.123.2

R1 is also using the static route as a default route. The gateway of last

resort is set to 172.12.123.2, the next-hop address set in the static

default route.

For your CCNA exams, it’s very important to know how to remove a

command, not just enable one. Here, you saw that a static route isremoved with the no ip route command, followed by the static routebeing removed. It’s the same as configuring a static route; just put “no”

in front of the entire command.

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05.Static Routing Lab

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