CCNA LAB26: Configuring IP Floating Static Routes

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Lab Objective:
The objective of this lab exercise is for you to learn how to implement IP floating static route functionality on a Cisco router.

Lab Purpose:
Configuring a floating static route will allow your Cisco router to have a backup route to a destination in case the primary route fails. As a Cisco engineer, as well as in the Cisco CCNA exam, you will be expected to know how to implement IP floating static route functionality.

Certification Level:
This lab is suitable for CCENT certification exam preparation.

Lab Difficulty:
This lab has a difficulty rating of 6/10.

Readiness Assessment:
When you are ready for your certification exam, you should complete this lab in no more than 10 minutes.

Lab Topology:
Please use the following topology to complete this lab exercise:




Note: Both R2 and R3 connect to the Internet, so R1 has two exit options to the Internet.

Task 1:
Configure the hostnames on R1, R2, and R3 as illustrated in the topology.

Task 2:
Configure the IP addresses on the Gig0/0 and Gig0/1 interfaces of R1, R2, and R3 as illustrated in the topology.


Note: R1 will always have the .1 IP in each of its Gig interfaces.

Note: R2 and R3 will have the .1 IP on the Gig0/1 interface.

Task 3:
Configure two default static routes on R1:

The first one (primary one) will go to R2 with an administrative distance of 1.
The secondary one will go to R3 with an administrative distance of 254.
Based on this, all traffic going to an unknown destination will be sent via R2.

Task 4:
Shut down the interface Gig0/0 of R1 and check via some show commands how the secondary route kicks in:

show ip route
show ip interface brief
Task 5:
Bring the interface Gig0/0 of R1 up again and check how it takes the primary role because of the lower administrative distance.

Run the same show commands and check the results.

Configuration and Verification
Task 1:
For reference information on configuring hostnames, please refer to earlier labs.


Task 2:
R1#conf t
Enter configuration commands, one per line.  End with CTRL/Z.
R1(config)#int gig0/0
R1(config-if)#no shutdown
R1(config-if)#ip add 192.168.10.1 255.255.255.252
R1(config-if)#end
R1(config)#int gig0/1
R1(config-if)#no shutdown
R1(config-if)#ip add 192.168.20.1 255.255.255.252
R1(config-if)#end
R1#

R2(config)#int gig0/0
R2(config-if)#no shutdown
R2(config-if)#ip add 192.168.10.2 255.255.255.252
R2(config-if)#end
R2(config)#int gig0/1
R2(config-if)#no shutdown
R2(config-if)#ip add 192.168.30.1 255.255.255.252
R2(config-if)#end
R2#

R3(config)#int gig0/0
R3(config-if)#no shutdown
R3(config-if)#ip add 192.168.20.2 255.255.255.252
R3(config-if)#end
R3(config)#int gig0/1
R3(config-if)#no shutdown
R3(config-if)#ip add 192.168.40.1 255.255.255.252
R3(config-if)#end
R3#
Task 3:
R1#config t
Enter configuration commands, one per line.  End with CTRL/Z.
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.10.2
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.20.2 254
Task 4:
R1#config t
Enter configuration commands, one per line.  End with CTRL/Z.

R1(config)#int gig0/0
R1(config-if)#shutdown

R1#sh ip route
Codes: C - connected, S - static, 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,
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1,
       L2 - IS-IS level2, ia - IS-IS inter area,
       * - candidate default, U - per-user static, o - ODR,   
       P - periodic downloaded static route

Gateway of last resort is 192.168.20.2 to network 0.0.0.0

192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.20.0/30 is directly connected, GigabitEthernet0/1
L 192.168.20.1/32 is directly connected, GigabitEthernet0/1
S* 0.0.0.0/0 [254/0] via 192.168.20.2

R1#sh ip int brief
Interface          IP-Address   OK? Method Status             Protocol
GigabitEthernet0/0 192.168.10.1 YES manual administratively down down     
GigabitEthernet0/1 192.168.20.1 YES manual up                    up
Task 5:
R1#config t
Enter configuration commands, one per line.  End with CTRL/Z.
R1(config)#int gig0/0
R1(config-if)#no shutdown

R1#sh ip route
Codes: C - connected, S - static, 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,
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1,
       L2 - IS-IS level2, ia - IS-IS inter area,
       * - candidate default, U - per-user static,
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 192.168.10.2 to network 0.0.0.0

        192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.10.0/30 is directly connected, GigabitEthernet0/0
L       192.168.10.1/32 is directly connected, GigabitEthernet0/0
        192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.20.0/30 is directly connected, GigabitEthernet0/1
L       192.168.20.1/32 is directly connected, GigabitEthernet0/1
S*   0.0.0.0/0 [1/0] via 192.168.10.2

R1#show ip int brief
Interface            IP-Address    OK? Method Status             Protocol
GigabitEthernet0/0  192.168.10.1  YES manual up                up
GigabitEthernet0/1  192.168.20.1  YES manual up                up


来源: CCNA LAB20: Configuring Static Routing via Interfaces
来源: CCNA LAB21:  Configuring Static Routing via IP addresses
来源: CCNA LAB22: Configuring and Naming Static Routes
来源: CCNA LAB23: Configuring Default Static Routes
来源: CCNA LAB24: Configuring IPv6 Static Routes
来源: CCNA LAB25: Configuring IPv6 Default Routes