SEE ATTACHMENTS

Interface names may vary among network device types. The interface names shown in the topology image are consistent with those found in the lab activity document. Use the IOS show interface and show controllers commands to determine the actual interface names for the devices used in the lab pod.

When you have completed the activities, answer the questions that are within the individual labs in a Word Document. Within your submission, include your completed

Lab Assignment Report

. Save and name your file, “CIS204_U2_LabAssignment_LastName x”.

You must complete the activities in the following order:

• Lab 7.1.4.8: Configuring OSFPv2 Advanced Features
  Configuring OSFPv2 Advanced Features
• Lab 4.2.2.5: Configuring Basic EIGRP for IPV4
  Configuring Basic EIGRP for IPV4
• Lab 5.1.5.5: Configuring Advanced EIGRP for IPv4 Features
  Configuring Advanced EIGRP for IPv4 Features
• Lab 5.2.3.7: Troubleshooting Advanced EIGRP
  Troubleshooting Advanced EIGRP
• Lab 7.2.3.4: Troubleshooting Advanced Single-Area OSPFv2
  Troubleshooting Advanced Single-Area OSPFv2

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Lab – Configuring Basic EIGRP for IPv4

Topology

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Addressing Table

Device Interface IP Address Subnet Mask Default Gateway

R1 G0/0 192.168.1.1 255.255.255.0 N/A

S0/0/0 (DCE) 10.1.1.1 255.255.255.252 N/A

S0/0/1 10.3.3.1 255.255.255.252 N/A

R2 G0/0 192.168.2.1 255.255.255.0 N/A

S0/0/0 10.1.1.2 255.255.255.252 N/A

S0/0/1 (DCE) 10.2.2.2 255.255.255.252 N/A

R3 G0/0 192.168.3.1 255.255.255.0 N/A

S0/0/0 (DCE) 10.3.3.2 255.255.255.252 N/A

S0/0/1 10.2.2.1 255.255.255.252 N/A

PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1

PC-B NIC 192.168.2.3 255.255.255.0 192.168.2.1

PC-C NIC 192.168.3.3 255.255.255.0 192.168.3.1

Objectives

Part 1: Build the Network and Verify Connectivity

Part 2: Configure EIGRP Routing

Part 3: Verify EIGRP Routing

Part 4: Configure Bandwidth and Passive Interfaces

Background / Scenario

Enhanced Interior Gateway Routing Protocol (EIGRP) is a powerful distance vector routing protocol and is
relatively easy to configure for basic networks.

In this lab, you will configure EIGRP for the topology and networks shown above. You will modify bandwidth
and configure passive interfaces to allow EIGRP to function more efficiently.

Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with
Cisco IOS Release 15.2(4)M3 (universalk9 image). Other routers and Cisco IOS versions can be used.
Depending on the model and Cisco IOS version, the commands available and output produced might vary
from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the
correct interface identifiers.

Note: Make sure that the routers have been erased and have no startup configurations. If you are unsure,
contact your instructor.

Required Resources

 3 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)

 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

 Console cables to configure the Cisco IOS devices via the console ports

 Ethernet and serial cables as shown in the topology

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Part 1: Build the Network and Verify Connectivity

In Part 1, you will set up the network topology and configure basic settings, such as the interface IP
addresses, device access, and passwords.

Step 1: Cable the network as shown in the topology.

Step 2: Configure PC hosts.

Step 3: Initialize and reload the routers as necessary.

Step 4: Configure basic settings for each router.

a. Disable DNS lookup.

b. Configure IP addresses for the routers, as listed in the Addressing Table.

c. Configure device name as shown in the topology.

d. Assign cisco as the console and vty passwords.

e. Assign class as the privileged EXEC password.

f. Configure logging synchronous to prevent console and vty messages from interrupting command entry.

g. Configure a message of the day.

h. Copy the running configuration to the startup configuration.

Step 5: Verify connectivity.

The routers should be able to ping one another, and each PC should be able to ping its default gateway. The
PCs will not be able to ping other PCs until EIGRP routing is configured. Verify and troubleshoot if necessary.

Part 2: Configure EIGRP Routing

Step 1: Enable EIGRP routing on R1. Use AS number 10.

R1(config)# router eigrp 10

Step 2: Advertise the directly connected networks on R1 using the wildcard mask.

R1(config-router)# network 10.1.1.0 0.0.0.3

R1(config-router)# network 192.168.1.0 0.0.0.255

R1(config-router)# network 10.3.3.0 0.0.0.3

Why is it a good practice to use wildcard masks when advertising networks? Could the mask have been
omitted from any of the network statements above? If so, which one(s)?

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Step 3: Enable EIGRP routing and advertise the directly connected networks on R2 and R3.

You will see neighbor adjacency messages as interfaces are added to the EIGRP routing process. The
messages on R2 are displayed as an example.

*Apr 14 15:24:59.543: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 10.1.1.1

(Serial0/0/0) is up: new adjacency

Step 4: Verify end-to-end connectivity.

All devices should be able to ping each other if EIGRP is configured correctly.

Note: Depending on the operating system, it may be necessary to disable the firewall for the pings to the host
PCs to be successful.

Part 3: Verify EIGRP Routing

Step 1: Examine the EIGRP neighbor table.

On R1, issue the show ip eigrp neighbors command to verify that the adjacency has been established with
its neighboring routers.

R1# show ip eigrp neighbors

EIGRP-IPv4 Neighbors for AS(10)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

1 10.3.3.2 Se0/0/1 13 00:24:58 8 100 0 17

0 10.1.1.2 Se0/0/0 13 00:29:23 7 100 0 23

Step 2: Examine the IP EIGRP routing table.

R1# show ip route eigrp

Codes: L – local, 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 level-2

ia – IS-IS inter area, * – candidate default, U – per-user static route

o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP

+ – replicated route, % – next hop override

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

D 10.2.2.0/30 [90/2681856] via 10.3.3.2, 00:29:01, Serial0/0/1

[90/2681856] via 10.1.1.2, 00:29:01, Serial0/0/0

D 192.168.2.0/24 [90/2172416] via 10.1.1.2, 00:29:01, Serial0/0/0

D 192.168.3.0/24 [90/2172416] via 10.3.3.2, 00:27:56, Serial0/0/1

Why does R1 have two paths to the 10.2.2.0/30 network?

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Step 3: Examine the EIGRP topology table.

R1# show ip eigrp topology

EIGRP-IPv4 Topology Table for AS(10)/ID(192.168.1.1)

Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply,

r – reply Status, s – sia Status

P 192.168.3.0/24, 1 successors, FD is 2172416

via 10.3.3.2 (2172416/28160), Serial0/0/1

P 192.168.2.0/24, 1 successors, FD is 2172416

via 10.1.1.2 (2172416/28160), Serial0/0/0

P 10.2.2.0/30, 2 successors, FD is 2681856

via 10.1.1.2 (2681856/2169856), Serial0/0/0

via 10.3.3.2 (2681856/2169856), Serial0/0/1

P 10.3.3.0/30, 1 successors, FD is 2169856

via Connected, Serial0/0/1

P 192.168.1.0/24, 1 successors, FD is 2816

via Connected, GigabitEthernet0/0

P 10.1.1.0/30, 1 successors, FD is 2169856

via Connected, Serial0/0/0

Why are there no feasible successors listed in the R1 topology table?

Step 4: Verify the EIGRP routing parameters and networks advertised.

Issue the show ip protocols command to verify the EIGRP routing parameters used.

R1# show ip protocols

*** IP Routing is NSF aware ***

Routing Protocol is “eigrp 10”

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Default networks flagged in outgoing updates

Default networks accepted from incoming updates

EIGRP-IPv4 Protocol for AS(10)

Metric weight K1=1, K2=0, K3=1, K4=0, K5=0

NSF-aware route hold timer is 240

Router-ID: 192.168.1.1

Topology : 0 (base)

Active Timer: 3 min

Distance: internal 90 external 170

Maximum path: 4

Maximum hopcount 100

Maximum metric variance 1

Automatic Summarization: disabled

Maximum path: 4

Routing for Networks:

10.1.1.0/30

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10.3.3.0/30

192.168.1.0

Routing Information Sources:

Gateway Distance Last Update

10.3.3.2 90 02:38:34

10.1.1.2 90 02:38:34

Distance: internal 90 external 170

Based on the output of issuing the show ip protocols command, answer the following questions.

What AS number is used?

What networks are advertised?

What is the administrative distance for EIGRP?

How many equal cost paths does EIGRP use by default?

Part 4: Configure Bandwidth and Passive Interfaces

EIGRP uses a default bandwidth based on the type of interface in the router. In Part 4, you will modify the
bandwidth so that the link between R1 and R3 has a lower bandwidth than the link between R1/R2 and
R2/R3. In addition, you will set passive interfaces on each router.

Step 1: Observe the current routing settings.

a. Issue the show interface s0/0/0 command on R1.

R1# show interface s0/0/0

Serial0/0/0 is up, line protocol is up

Hardware is WIC MBRD Serial

Internet address is 10.1.1.1/30

MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:01, output 00:00:02, output hang never

Last clearing of “show interface” counters 03:43:45

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

4050 packets input, 270294 bytes, 0 no buffer

Received 1554 broadcasts (0 IP multicasts)

0 runts, 0 giants, 0 throttles

1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort

4044 packets output, 271278 bytes, 0 underruns

0 output errors, 0 collisions, 5 interface resets

4 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

12 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

What is the default bandwidth for this serial interface?

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b. How many routes are listed in the routing table to reach the 10.2.2.0/30 network?

Step 2: Modify the bandwidth on the routers.

a. Modify the bandwidth on R1 for the serial interfaces.

R1(config)# interface s0/0/0

R1(config-if)# bandwidth 2000

R1(config-if)# interface s0/0/1

R1(config-if)# bandwidth 64

Issue show ip route command on R1. Is there a difference in the routing table? If so, what is it?

Codes: L – local, 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 level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
+ – replicated route, % – next hop override

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

C 10.1.1.0/30 is directly connected, Serial0/0/0

L 10.1.1.1/32 is directly connected, Serial0/0/0

D 10.2.2.0/30 [90/2681856] via 10.1.1.2, 00:03:09, Serial0/0/0

C 10.3.3.0/30 is directly connected, Serial0/0/1

L 10.3.3.1/32 is directly connected, Serial0/0/1

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, GigabitEthernet0/0

L 192.168.1.1/32 is directly connected, GigabitEthernet0/0

D 192.168.2.0/24 [90/1794560] via 10.1.1.2, 00:03:09, Serial0/0/0

D 192.168.3.0/24 [90/2684416] via 10.1.1.2, 00:03:08, Serial0/0/0

b. Modify the bandwidth on the R2 and R3 serial interfaces.

R2(config)# interface s0/0/0

R2(config-if)# bandwidth 2000

R2(config-if)# interface s0/0/1

R2(config-if)# bandwidth 2000

R3(config)# interface s0/0/0

R3(config-if)# bandwidth 64

R3(config-if)# interface s0/0/1

R3(config-if)# bandwidth 2000

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Step 3: Verify the bandwidth modifications.

a. Verify bandwidth modifications. Issue a show interface serial 0/0/x command, with x being the
appropriate serial interface on all three routers to verify that bandwidth is set correctly. R1 is shown as an
example.

R1# show interface s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is WIC MBRD Serial
Internet address is 10.1.1.1/30

MTU 1500 bytes, BW 2000 Kbit/sec, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:01, output 00:00:02, output hang never

Last clearing of “show interface” counters 04:06:06

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec

4767 packets input, 317155 bytes, 0 no buffer

Received 1713 broadcasts (0 IP multicasts)

0 runts, 0 giants, 0 throttles
1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort

4825 packets output, 316451 bytes, 0 underruns

0 output errors, 0 collisions, 5 interface resets
4 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
12 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

Based on your bandwidth configuration, try and determine what the R2 and R3 routing tables will look like
before you issue a show ip route command. Are their routing tables the same or different?

Step 4: Configure G0/0 interface as passive on R1, R2, and R3.

A passive interface does not allow outgoing and incoming routing updates over the configured interface. The
passive-interface interface command causes the router to stop sending and receiving Hello packets over an
interface; however, the network associated with the interface is still advertised to other routers through the
non-passive interfaces. Router interfaces connected to LANs are typically configured as passive.

R1(config)# router eigrp 10

R1(config-router)# passive-interface g0/0

R2(config)# router eigrp 10

R2(config-router)# passive-interface g0/0

R3(config)# router eigrp 10

R3(config-router)# passive-interface g0/0

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Step 5: Verify the passive interface configuration.

Issue a show ip protocols command on R1, R2, and R3 and verify that G0/0 has been configured as
passive.

R1# show ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is “eigrp 10”
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 Protocol for AS(10)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 192.168.1.1
Topology : 0 (base)
Active Timer: 3 min

Distance: internal 90 external 170

Maximum path: 4

Maximum hopcount 100
Maximum metric variance 1

Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:

10.1.1.0/30

10.3.3.0/30
192.168.1.0

Passive Interface(s):

GigabitEthernet0/0

Routing Information Sources:
Gateway Distance Last Update

10.3.3.2 90 00:48:09

10.1.1.2 90 00:48:26

Distance: internal 90 external 170

Reflection

You could have used only static routing for this lab. What is an advantage of using EIGRP?

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Router Interface Summary Table

Router Interface Summary

Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2

1800 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

1900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2801 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/1/0 (S0/1/0) Serial 0/1/1 (S0/1/1)

2811 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many
interfaces the router has. There is no way to effectively list all the combinations of configurations for each router
class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.
The table does not include any other type of interface, even though a specific router may contain one. An
example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be
used in Cisco IOS commands to represent the interface.

TextField1:

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Lab – Configuring Advanced EIGRP for IPv4 Features

Topology

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Addressing Table

Device Interface IP Address Subnet Mask Default Gateway

R1 G0/0 192.168.1.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.12.1 255.255.255.252 N/A

S0/0/1 192.168.13.1 255.255.255.252 N/A

Lo1 192.168.11.1 255.255.255.252 N/A

Lo5 192.168.11.5 255.255.255.252 N/A

Lo9 192.168.11.9 255.255.255.252 N/A

Lo13 192.168.11.13 255.255.255.252 N/A

R2 G0/0 192.168.2.1 255.255.255.0 N/A

S0/0/0 192.168.12.2 255.255.255.252 N/A

S0/0/1 (DCE) 192.168.23.1 255.255.255.252 N/A

Lo1 192.168.22.1 255.255.255.252 N/A

R3 G0/0 192.168.3.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.13.2 255.255.255.252 N/A

S0/0/1 192.168.23.2 255.255.255.252 N/A

Lo1 192.168.33.1 255.255.255.252 N/A

Lo5 192.168.33.5 255.255.255.252 N/A

Lo9 192.168.33.9 255.255.255.252 N/A

Lo13 192.168.33.13 255.255.255.252 N/A

PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1

PC-B NIC 192.168.2.3 255.255.255.0 192.168.2.1

PC-C NIC 192.168.3.3 255.255.255.0 192.168.3.1

Objectives

Part 1: Build the Network and Configure Basic Device Settings

Part 2: Configure EIGRP and Verify Connectivity

Part 3: Configure Summarization for EIGRP

 Configure EIGRP for automatic summarization.

 Configure manual summarization for EIGRP.

Part 4: Configure and Propagate a Default Static Route

Part 5: Fine-Tune EIGRP

 Configure bandwidth utilization for EIGRP.

 Configure Hello and Hold timers for EIGRP.

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Part 6: Configure EIGRP Authentication

Background / Scenario

EIGRP has advanced features to allow changes related to summarization, default route propagation,
bandwidth utilization, metrics, and security.

In this lab, you will configure automatic and manual summarization for EIGRP, configure EIGRP route
propagation, fine-tune EIGRP metrics, and use MD5 authentication to secure EIGRP routing information.

Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with
Cisco IOS Release 15.2(4)M3 (universalk9 image). Other routers and Cisco IOS versions can be used.
Depending on the model and Cisco IOS version, the commands available and output produced might vary
from what is shown in the labs. Refer to the Router Interface Summary Table at this end of the lab for the
correct interface identifiers.

Note: Ensure that the routers have been erased and have no startup configurations. If you are unsure,
contact your instructor.

Required Resources

 3 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)

 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

 Console cables to configure the Cisco IOS devices via the console ports

 Ethernet and serial cables as shown in the topology

Part 1: Build the Network and Configure Basic Device Settings

In Part 1, you will set up the network topology and configure basic settings on the PC hosts and routers.

Step 1: Cable the network as shown in the topology.

Step 2: Configure PC hosts.

Step 3: Initialize and reload the routers as necessary.

Step 4: Configure basic settings for each router.

a. Disable DNS lookup.

b. Configure device name as shown in the topology.

c. Assign cisco as the console and vty passwords.

d. Assign class as the privileged EXEC password.

e. Configure logging synchronous to prevent console messages from interrupting command entry.

f. Configure the IP address listed in the Addressing Table for all interfaces.

Note: Do NOT configure the loopback interfaces at this time.

g. Copy the running configuration to the startup configuration.

Part 2: Configure EIGRP and Verify Connectivity

In Part 2, you will configure basic EIGRP for the topology and set bandwidths for the serial interfaces.

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Note: This lab provides minimal assistance with the actual commands necessary to configure EIGRP.
However, the required commands are provided in Appendix A. Test your knowledge by trying to configure the
devices without referring to the appendix.

Step 1: Configure EIGRP.

a. On R1, configure EIGRP routing with an autonomous system (AS) ID of 1 for all directly connected
networks. Write the commands used in the space below.

b. For the LAN interface on R1, disable the transmission of EIGRP Hello packets. Write the command used
in the space below.

c. On R1, configure the bandwidth for S0/0/0 to 1024 Kb/s and the bandwidth for S0/0/1 to 64 Kb/s. Write
the commands used in the space below. Note: The bandwidth command only affects the EIGRP metric
calculation, not the actual bandwidth of the serial link.

d. On R2, configure EIGRP routing with an AS ID of 1 for all networks, disable the transmission of EIGRP
Hello packets for the LAN interface, and configure the bandwidth for S0/0/0 to 1024 Kb/s.

e. On R3, configure EIGRP routing with an AS ID of 1 for all networks, disable the transmission of EIGRP
Hello packets for the LAN interface, and configure the bandwidth for S0/0/0 to 64 Kb/s.

Step 2: Test connectivity.

All PCs should be able to ping one another. Verify and troubleshoot if necessary.

Note: It may be necessary to disable the PC firewall to ping between PCs.

Part 3: Configure Summarization for EIGRP

In Part 3, you will add loopback interfaces to R1, enable EIGRP automatic summarization on R1, and observe
the effects on the routing table for R2. You will also add loopback interfaces on R3.

Step 1: Configure EIGRP for automatic summarization.

a. Issue the show ip protocols command on R1. What is the default status of automatic summarization in
EIGRP?

b. Configure the loopback addresses on R1.

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c. Add the appropriate network statements to the EIGRP process on R1. Record the commands used in the
space below.

d. On R2, issue the show ip route eigrp command. How are the loopback networks represented in the
output?

e. On R1, issue the auto-summary command inside the EIGRP process.

R1(config)# router eigrp 1

R1(config-router)# auto-summary

R1(config-router)#

*Apr 14 01:14:55.463: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.13.2

(Serial0/0/1) is resync: summary configured

*Apr 14 01:14:55.463: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.12.2

(Serial0/0/0) is resync: summary configured

*Apr 14 01:14:55.463: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.13.2

(Serial0/0/1) is resync: summary up, remove components

R1(config-router)#67: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.12.2

(Serial0/0/0) is resync: summary up, remove components

*Apr 14 01:14:55.467: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.12.2

(Serial0/0/0) is resync: summary up, remove components

*Apr 14 01:14:55.467: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.13.2

(Serial0/0/1) is resync: summary up, remove components

How does the routing table on R2 change?

Step 2: Configure manual summarization for EIGRP.

a. Configure the loopback addresses on R3.

b. Add the appropriate network statements to the EIGRP process on R3.

c. On R2, issue the show ip route eigrp command. How are the loopback networks from R3 represented in
the output?

d. Determine the summary EIGRP route for the loopback addresses on R3. Write the summary route in the
space below.

e. For the serial interfaces on R3, issue the ip summary-address eigrp 1 network address subnet mask
command to manually summarize the networks.

R3(config)# interface s0/0/0

R3(config-if)# ip summary-address eigrp 1 192.168.33.0 255.255.255.240

R3(config-if)# exit

R3(config)# interface s0/0/1

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R3(config-if)# ip summary-address eigrp 1 192.168.33.0 255.255.255.240

*Apr 14 01:33:46.433: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.13.1

(Serial0/0/0) is resync: summary configured

*Apr 14 01:33:46.433: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.23.1

(Serial0/0/1) is resync: summary configured
How does the routing table on R2 change?

Part 4: Configure and Propagate a Default Static Route

In Part 4, you will configure a default static route on R2 and propagate the route to all other routers.

a. Configure the loopback address on R2.

b. Configure a default static route with an exit interface of Lo1.

R2(config)# ip route 0.0.0.0 0.0.0.0 Lo1

c. Use the redistribute static command within the EIGRP process to propagate the default static route to
other participating routers.

R2(config)# router eigrp 1

R2(config-router)# redistribute static

d. Use the show ip protocols command on R2 to verify the static route is being distributed.

R2# show ip protocols

*** IP Routing is NSF aware ***

Routing Protocol is “eigrp 1”

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Default networks flagged in outgoing updates

Default networks accepted from incoming updates

Redistributing: static

EIGRP-IPv4 Protocol for AS(1)

Metric weight K1=1, K2=0, K3=1, K4=0, K5=0

NSF-aware route hold timer is 240

Router-ID: 192.168.23.1

Topology : 0 (base)

Active Timer: 3 min

Distance: internal 90 external 170

Maximum path: 4

Maximum hopcount 100

Maximum metric variance 1

Automatic Summarization: disabled

Maximum path: 4

Routing for Networks:

192.168.2.0

192.168.12.0/30

192.168.23.0/30

Passive Interface(s):

GigabitEthernet0/0

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Routing Information Sources:

Gateway Distance Last Update

192.168.12.1 90 00:13:20

192.168.23.2 90 00:13:20

Distance: internal 90 external 170

e. On R1, issue the show ip route eigrp | include 0.0.0.0 command to view statements specific to the
default route. How is the static default route represented in the output? What is the administrative
distance (AD) for the propagated route?

Part 5: Fine-Tune EIGRP

In Part 5, you will configure the percentage of bandwidth that can be used by an EIGRP interface and change
the Hello and Hold timers for EIGRP interfaces.

Step 1: Configure bandwidth utilization for EIGRP.

a. Configure the serial link between R1 and R2 to allow only 75 percent of the link bandwidth for EIGRP
traffic.

R1(config)# interface s0/0/0

R1(config-if)# ip bandwidth-percent eigrp 1 75

R2(config)# interface s0/0/0

R2(config-if)# ip bandwidth-percent eigrp 1 75

b. Configure the serial link between R1 and R3 to allow 40 percent of the links bandwidth for EIGRP traffic.

Step 2: Configure Hello and Hold Timers for EIGRP.

a. On R2, use the show ip eigrp interfaces detail command to view the Hello and Hold timers for EIGRP.

R2# show ip eigrp interfaces detail

EIGRP-IPv4 Interfaces for AS(1)

Xmit Queue PeerQ Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes

Se0/0/0 1 0/0 0/0 1 0/15 50 0

Hello-interval is 5, Hold-time is 15

Split-horizon is enabled

Next xmit serial

Packetized sent/expedited: 29/1

Hello’s sent/expedited: 390/2

Un/reliable mcasts: 0/0 Un/reliable ucasts: 35/39

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0

Retransmissions sent: 0 Out-of-sequence rcvd: 0

Topology-ids on interface – 0

Interface BW percentage is 75

Authentication mode is not set

Se0/0/1 1 0/0 0/0 1 0/16 50 0

Hello-interval is 5, Hold-time is 15
Split-horizon is enabled

Next xmit serial

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Packetized sent/expedited: 34/5

Hello’s sent/expedited: 382/2

Un/reliable mcasts: 0/0 Un/reliable ucasts: 31/42

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 2

Retransmissions sent: 0 Out-of-sequence rcvd: 0
Topology-ids on interface – 0
Authentication mode is not set

What is the default value for hello time?

What is the default value for hold time?

b. Configure S0/0/0 and S0/0/1 interfaces on R1 to use a Hello interval of 60 seconds and a Hold time of
180 seconds in that specific order.

R1(config)# interface s0/0/0

R1(config-if)# ip hello-interval eigrp 1 60

R1(config-if)# ip hold-time eigrp 1 180

R1(config)# interface s0/0/1

R1(config-if)# ip hello-interval eigrp 1 60
R1(config-if)# ip hold-time eigrp 1 180

c. Configure the serial interfaces on R2 and R3 to use a Hello interval of 60 seconds and a Hold time of 180
seconds.

d. Use the show ip eigrp interfaces detail command on R2 to verify configuration.

Part 6: Configure EIGRP Authentication

In Part 6, you will create an authentication key on all routers and configure router interfaces to use MD5
authentication for EIGRP message authentication.

Step 1: Configure authentication keys.

a. On R1, use the key chain name command in global configuration mode to create a key chain with the
label EIGRP-KEYS.

R1(config)# key chain EIGRP-KEYS

R1(config-keychain)# key 1

R1(config-keychain-key)# key-string cisco

b. Complete the configuration on R2 and R3.

c. Issue the show key chain command. You should have the same output on every router.

Step 2: Configure EIGRP link authentication.

a. Apply the following commands to active EIGRP authentication on the serial interfaces on R1.

R1# conf t

R1(config)# interface s0/0/0

R1(config-if)# ip authentication key-chain eigrp 1 EIGRP-KEYS

R1(config-if)# ip authentication mode eigrp 1 md5

R1(config-if)# interface s0/0/1

R1(config-if)# ip authentication key-chain eigrp 1 EIGRP-KEYS
R1(config-if)# ip authentication mode eigrp 1 md5

b. Activate EIGRP authentication on the serial interfaces on R2 and R3.

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c. On R2, use the show ip eigrp interfaces detail command to verify authentication.

R2# show ip eigrp interfaces detail
EIGRP-IPv4 Interfaces for AS(1)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes

Se0/0/0 1 0/0 0/0 1 0/23 50 0

Hello-interval is 60, Hold-time is 180

Split-horizon is enabled
Next xmit serial

Packetized sent/expedited: 30/5

Hello’s sent/expedited: 1163/5

Un/reliable mcasts: 0/0 Un/reliable ucasts: 25/34

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Topology-ids on interface – 0

Authentication mode is md5, key-chain is “EIGRP-KEYS”

Se0/0/1 1 0/0 0/0 2 0/15 50 0

Hello-interval is 60, Hold-time is 180
Split-horizon is enabled
Next xmit serial

Packetized sent/expedited: 31/1

Hello’s sent/expedited: 1354/3

Un/reliable mcasts: 0/0 Un/reliable ucasts: 28/34

Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 4

Retransmissions sent: 0 Out-of-sequence rcvd: 0
Topology-ids on interface – 0
Authentication mode is md5, key-chain is “EIGRP-KEYS”

Reflection

1. What are the benefits of summarizing routes?

2. When setting EIGRP timers, why is it important to make the hold time value equal to or greater than the Hello
interval?

3. Why is it important to configure authentication for EIGRP?

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Router Interface Summary Table

Router Interface Summary

Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2

1800 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

1900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2801 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/1/0 (S0/1/0) Serial 0/1/1 (S0/1/1)

2811 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many
interfaces the router has. There is no way to effectively list all the combinations of configurations for each router
class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.
The table does not include any other type of interface, even though a specific router may contain one. An
example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be
used in Cisco IOS commands to represent the interface.

Appendix A: Configuration Commands

Router R1

R1(config)# router eigrp 1

R1(config-router)# network 192.168.1.0

R1(config-router)# network 192.168.12.0 0.0.0.3

R1(config-router)# network 192.168.13.0 0.0.0.3

R1(config-router)# network 192.168.11.0 0.0.0.3

R1(config-router)# network 192.168.11.4 0.0.0.3

R1(config-router)# network 192.168.11.8 0.0.0.3

R1(config-router)# network 192.168.11.12 0.0.0.3

R1(config-router)# passive-interface g0/0

R1(config)# int s0/0/0

R1(config-if)# bandwidth 1024

R1(config-if)# int s0/0/1

R1(config-if)# bandwidth 64

Router R2

R2(config)# router eigrp 1

R2(config-router)# network 192.168.2.0

R2(config-router)# network 192.168.12.0 0.0.0.3

R2(config-router)# network 192.168.23.0 0.0.0.3

R2(config-router)# passive-interface g0/0

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R2(config)# int s0/0/0

R2(config-if)# bandwidth 1024

Router R3

R3(config)# router eigrp 1

R3(config-router)# network 192.168.3.0

R3(config-router)# network 192.168.13.0 0.0.0.3

R3(config-router)# network 192.168.23.0 0.0.0.3

R3(config-router)# network 192.168.33.0 0.0.0.3

R3(config-router)# network 192.168.33.4 0.0.0.3

R3(config-router)# network 192.168.33.8 0.0.0.3

R3(config-router)# network 192.168.33.12 0.0.0.3

R3(config-router)# passive-interface g0/0

R3(config)# int s0/0/0

R3(config-if)# bandwidth 64

TextField1:

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Lab – Configuring OSFPv2 Advanced Features

Topology

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Addressing Table

Device Interface IP Address Subnet Mask Default Gateway

R1 G0/0 192.168.1.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.12.1 255.255.255.252 N/A

S0/0/1 192.168.13.1 255.255.255.252 N/A

R2 Lo0 209.165.200.225 255.255.255.252 N/A

S0/0/0 192.168.12.2 255.255.255.252 N/A

S0/0/1 (DCE) 192.168.23.1 255.255.255.252 N/A

R3 G0/0 192.168.3.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.13.2 255.255.255.252 N/A

S0/0/1 192.168.23.2 255.255.255.252 N/A

PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1

PC-C NIC 192.168.3.3 255.255.255.0 192.168.3.1

Objectives

Part 1: Build the Network and Configure Basic Device Settings

Part 2: Configure and Verify OSPF Routing

Part 3: Change OSPF Metrics

Part 4: Configure and Propagate a Static Default Route

Part 5: Configure OSPF Authentication

Background / Scenario

Open Shortest Path First (OSPF) has advanced features to allow changes to be made to control metrics,
default route propagation, and security.

In this lab, you will adjust OSPF metrics on the router interfaces, configure OSPF route propagation, and use
Message Digest 5 (MD5) authentication to secure OSPF routing information.

Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with
Cisco IOS Release 15.2(4)M3 (universalk9 image). Other routers and Cisco IOS versions can be used.
Depending on the model and Cisco IOS version, the commands available and output produced might vary
from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the
correct interface identifiers.

Note: Make sure that the routers have been erased and have no startup configurations. If you are unsure,
contact your instructor.

Required Resources

 3 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)

 2 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

 Console cables to configure the Cisco IOS devices via the console ports

 Ethernet and serial cables as shown in the topology

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Part 1: Build the Network and Configure Basic Device Settings

In Part 1, you will set up the network topology and configure basic settings on the PC hosts and routers.

Step 1: Cable the network as shown in the topology.

Step 2: Initialize and reload the routers as necessary.

Step 3: Configure basic settings for each router.

a. Disable DNS lookup.

b. Configure device name as shown in the topology.

c. Assign class as the privileged EXEC password.

d. Assign cisco as the console and vty passwords.

e. Encrypt the clear text passwords.

f. Configure a MOTD banner to warn users that unauthorized access is prohibited.

g. Configure logging synchronous for the console line.

h. Configure the IP addresses listed in the Addressing Table for all interfaces.

i. Set the clock rate for all DCE serial interfaces at 128000.

j. Copy the running configuration to the startup configuration.

Step 4: Configure PC hosts.

Refer to the Addressing Table for PC host address information.

Step 5: Test connectivity.

At this point, the PCs are unable to ping each other. However, the routers should be able to ping the directly
connected neighbor interfaces, and the PCs should be able to ping their default gateway. Verify and
troubleshoot if necessary.

Part 2: Configure and Verify OSPF Routing

In Part 2, you will configure OSPFv2 routing on all routers in the network and then verify that routing tables
are updated correctly.

Step 1: Configure the router ID on all routers.

Assign 1 as the process ID for this OSPF process. Each router should be given the following router ID
assignments:

 R1 Router ID: 1.1.1.1

 R2 Router ID: 2.2.2.2

 R3 Router ID: 3.3.3.3

Step 2: Configure OSPF network information on the routers.

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Step 3: Verify OSPF routing.

a. Issue the show ip ospf neighbor command to verify that each router is listing the other routers in the
network.

b. Issue the show ip route ospf command to verify that all OSPF networks are present in the routing table
on all routers.

Step 4: Test end-to-end connectivity.

Ping PC-C from PC-A to verify end-to-end connectivity. The pings should be successful. If they are not,
troubleshoot as necessary.

Note: It may be necessary to disable the PC firewall for the pings to be successful.

Part 3: Change OSPF Metrics

In Part 3, you will change OSPF metrics using the bandwidth command, the auto-cost reference-
bandwidth command, and the ip ospf cost command. Making these changes will provide more accurate
metrics to OSPF.

Note: All DCE interfaces should have been configured with a clocking rate of 128000 in Part 1.

Step 1: Change the bandwidth on all serial interfaces to 128Kb/s.

a. Issue the show ip ospf interface brief command to view the default cost settings on the router
interfaces.

R1# show ip ospf interface brief

Interface

PID Area IP Address/Mask Cost State Nbrs F/C

Se0/0/1 1 0 192.168.13.1/30 64 P2P 1/1

Se0/0/0 1 0 192.168.12.1/30 64 P2P 1/1

Gi0/0 1 0 192.168.1.1/24 1 DR 0/0

b. Use the bandwidth 128 interface command on all serial interfaces.

c. Issue the show ip ospf interface brief command to view the new cost settings.

R1# show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C

Se0/0/1 1 0 192.168.13.1/30 781 P2P 1/1

Se0/0/0 1 0 192.168.12.1/30 781 P2P 1/1

Gi0/0 1 0 192.168.1.1/24 1 DR 0/0

Step 2: Change the reference bandwidth on the routers.

a. Issue the auto-cost reference-bandwidth 1000 command on the routers to change the default reference
bandwidth setting to account for Gigabit Ethernet Interfaces.

b. Re-issue the show ip ospf interface brief command to view how this command has changed cost
values.

R1# show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C

Se0/0/1 1 0 192.168.13.1/30 7812 P2P 0/0

Se0/0/0 1 0 192.168.12.1/30 7812 P2P 0/0

Gi0/0 1 0 192.168.1.1/24 1 DR 0/0

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Note: If the router had Fast Ethernet interfaces instead of Gigabit Ethernet interfaces, then the cost would
now be 10 on those interfaces.

Step 3: Change the route cost.

a. Issue the show ip route ospf command to display the current OSPF routes on R1. Notice that there are
currently two routes in the table that use the S0/0/1 interface.

R1# show ip route ospf

Codes: L – local, 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 level-2

ia – IS-IS inter area, * – candidate default, U – per-user static route

o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP

+ – replicated route, % – next hop override

Gateway of last resort is not set

O 192.168.3.0/24 [110/7822] via 192.168.13.2, 00:00:12, Serial0/0/1

192.168.23.0/30 is subnetted, 1 subnets

O 192.168.23.0 [110/15624] via 192.168.13.2, 00:00:12, Serial0/0/1

[110/15624] via 192.168.12.2, 00:20:03, Serial0/0/0

b. Apply the ip ospf cost 16000 command to the S0/0/1 interface on R1. A cost of 16,000 is higher than the
accumulated cost of the route through R2 which is 15,624.

c. Issue the show ip ospf interface brief command on R1 to view the cost change to S0/0/1.

R1# show ip ospf interface brief
Interface PID Area IP Address/Mask Cost State Nbrs F/C

Se0/0/1 1 0 192.168.13.1/30 16000 P2P 1/1

Se0/0/0 1 0 192.168.12.1/30 7812 P2P 1/1

Gi0/0 1 0 192.168.1.1/24 1 DR 0/0

d. Re-issue the show ip route ospf command on R1 to display the effect this change has made on the
routing table. All OSPF routes for R1 are now being routed through R2.

R1# show ip route ospf
Codes: L – local, 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 level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
+ – replicated route, % – next hop override

Gateway of last resort is not set

O 192.168.3.0/24 [110/15625] via 192.168.12.2, 00:05:31, Serial0/0/0

192.168.23.0/30 is subnetted, 1 subnets

O 192.168.23.0 [110/15624] via 192.168.12.2, 01:14:02, Serial0/0/0

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Explain why the route to the 192.168.3.0/24 network on R1 is now going through R2?

Part 4: Configure and Propagate a Static Default Route

In Part 4, you will use a loopback interface on R2 to simulate an ISP connection to the Internet. You will
create a static default route on R2, and then OSPF will propagate that route to the other two routers on the
network.

Step 1: Configure a static default route on R2 to loopback 0.

Configure a default route using the loopback interface configured in Part 1, to simulate a connection to an
ISP.

Step 2: Have OSPF propagate the default static route.

Issue the default-information originate command to include the static default route in the OSPF updates
that are sent from R2.

R2(config)# router ospf 1

R2(config-router)# default-information originate

Step 3: Verify OSPF static route propagation.

a. Issue the show ip route static command on R2.

R2# show ip route static

Codes: L – local, 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 level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
+ – replicated route, % – next hop override

Gateway of last resort is 0.0.0.0 to network 0.0.0.0

S* 0.0.0.0/0 is directly connected, Loopback0

b. Issue the show ip route command on R1 to verify the propagation of the static route from R2.

R1# show ip route

Codes: L – local, 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 level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP
+ – replicated route, % – next hop override

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Gateway of last resort is 192.168.12.2 to network 0.0.0.0

O*E2 0.0.0.0/0 [110/1] via 192.168.12.2, 00:02:57, Serial0/0/0

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, GigabitEthernet0/0

L 192.168.1.1/32 is directly connected, GigabitEthernet0/0

O 192.168.3.0/24 [110/15634] via 192.168.12.2, 00:03:35, Serial0/0/0

192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.12.0/30 is directly connected, Serial0/0/0

L 192.168.12.1/32 is directly connected, Serial0/0/0

192.168.13.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.13.0/30 is directly connected, Serial0/0/1

L 192.168.13.1/32 is directly connected, Serial0/0/1

192.168.23.0/30 is subnetted, 1 subnets

O 192.168.23.0 [110/15624] via 192.168.12.2, 00:05:18, Serial0/0/0

c. Verify end-to-end connectivity by issuing a ping from PC-A to the ISP interface address 209.165.200.225.

Were the pings successful?

Part 5: Configure OSPF Authentication

OSPF authentication can be set up at the link level or the area level. There are three authentication types
available for OSPF authentication: Null, plain text, or MD5. In Part 5, you will set up OSPF MD5
authentication, which is the strongest available.

Step 1: Set up MD5 OSPF authentication on a single link.

a. Issue the debug ip ospf adj command on R2 to view OSPF adjacency messages.

R2# debug ip ospf adj

OSPF adjacency debugging is on

b. Assign an MD5 key for OSPF Authentication on R1, interface S0/0/0.

R1(config)# interface s0/0/0

R1(config-if)# ip ospf message-digest-key 1 md5 MD5KEY

c. Activate MD5 authentication on R1, interface S0/0/0.

R1(config-if)# ip ospf authentication message-digest

OSPF debug messages informing you of a Mismatched Authentication type displays on R2.

*Mar 19 00:03:18.187: OSPF-1 ADJ Se0/0/0: Rcv pkt from 192.168.12.1 : Mismatched

Authentication type. Input packet specified type 2, we use type 0

d. Issue the u all command, which is the shortest version of the undebug all command on R2 to disable
debugging.

e. Configure OSPF authentication on R2, interface S0/0/0. Use the same MD5 password you entered for
R1.

f. Issue a show ip ospf interface s0/0/0 command on R2. This command displays the type of
authentication at the bottom of the output.

R2# show ip ospf interface s0/0/0

Serial0/0/0 is up, line protocol is up

Internet Address 192.168.12.2/30, Area 0, Attached via Network Statement

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Process ID 1, Router ID 2.2.2.2, Network Type POINT_TO_POINT, Cost: 7812

Topology-MTID Cost Disabled Shutdown Topology Name

0 7812 no no Base

Transmit Delay is 1 sec, State POINT_TO_POINT

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

oob-resync timeout 40

Hello due in 00:00:03

Supports Link-local Signaling (LLS)

Cisco NSF helper support enabled

IETF NSF helper support enabled

Index 1/1, flood queue length 0

Next 0x0(0)/0x0(0)

Last flood scan length is 1, maximum is 1

Last flood scan time is 0 msec, maximum is 0 msec

Neighbor Count is 1, Adjacent neighbor count is 1

Adjacent with neighbor 1.1.1.1

Suppress hello for 0 neighbor(s)

Message digest authentication enabled

Youngest key id is 1

Step 2: Set up OSPF Authentication at the area level.

a. Issue the area 0 authentication command to set MD5 authentication for OSPF Area 0 on R1.

R1(config)# router ospf 1

R1(config-router)# area 0 authentication message-digest

b. This option still requires that you assign the MD5 password at the interface level.

R1(config)# interface s0/0/1

R1(config-if)# ip ospf message-digest-key 1 md5 MD5KEY

c. Issue the show ip ospf neighbor command on R3. R1 no longer has an adjacency with R3.

R3# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 0 FULL/ – 00:00:31 192.168.23.1 Serial0/0/1

d. Set up area authentication on R3 and assign the same MD5 password to interface S0/0/0.

R3(config)# router ospf 1

R3(config-router)# area 0 authentication message-digest

R3(config-router)# interface s0/0/0

R3(config-if)# ip ospf message-digest-key 1 md5 MD5KEY

e. Issue the show ip ospf neighbor command on R3. Notice that R1 is now showing as a neighbor, but R2
is missing.

R3# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

1.1.1.1 0 FULL/ – 00:00:38 192.168.13.1 Serial0/0/0

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Why is R2 no longer showing as an OSPF neighbor?

f. Configure R2 to perform area-level MD5 authentication.

R2(config)# router ospf 1

R2(config-router)# area 0 authentication message-digest

g. Assign MD5KEY as the MD5 password for the link between R2 and R3.

h. Issue the show ip ospf neighbor command on all routers to verify that all adjacencies have been re-
established.

R1# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

3.3.3.3 0 FULL/ – 00:00:39 192.168.13.2 Serial0/0/1

2.2.2.2 0 FULL/ – 00:00:35 192.168.12.2 Serial0/0/0

R2# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

3.3.3.3 0 FULL/ – 00:00:36 192.168.23.2 Serial0/0/1

1.1.1.1 0 FULL/ – 00:00:32 192.168.12.1 Serial0/0/0

R3# show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 0 FULL/ – 00:00:33 192.168.23.1 Serial0/0/1

1.1.1.1 0 FULL/ – 00:00:39 192.168.13.1 Serial0/0/0

Reflection

1. What is the easiest and preferred method of manipulating OSPF route costs?

2. What does the default-information originate command do for a network using the OSPF routing protocol?

3. Why is it a good idea to use OSPF authentication?

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Router Interface Summary Table

Router Interface Summary

Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2

1800 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

1900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2801 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/1/0 (S0/1/0) Serial 0/1/1 (S0/1/1)

2811 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many
interfaces the router has. There is no way to effectively list all the combinations of configurations for each router
class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.
The table does not include any other type of interface, even though a specific router may contain one. An
example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be
used in Cisco IOS commands to represent the interface.

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Lab – Troubleshooting Advanced EIGRP

Topology

Lab – Troubleshooting Advanced EIGRP

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Addressing Table

Device Interface IP Address Subnet Mask Default Gateway

R1 G0/0 192.168.1.1 255.255.255.0 N/A

Lo1 172.16.11.1 255.255.255.0 N/A

Lo2 172.16.12.1 255.255.255.0 N/A

Lo3 172.16.13.1 255.255.255.0 N/A

Lo4 172.16.14.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.12.1 255.255.255.252 N/A

S0/0/1 192.168.13.1 255.255.255.252 N/A

R2 G0/0 192.168.2.1 255.255.255.0 N/A

Lo0 209.165.200.225 255.255.255.252 N/A

S0/0/0 192.168.12.2 255.255.255.252 N/A

S0/0/1 (DCE) 192.168.23.1 255.255.255.252 N/A

R3 G0/0 192.168.3.1 255.255.255.0 N/A

Lo3 172.16.33.1 255.255.255.0 N/A

Lo4 172.16.34.1 255.255.255.0 N/A

Lo5 172.16.35.1 255.255.255.0 N/A

Lo6 172.16.36.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.13.2 255.255.255.252 N/A

S0/0/1 192.168.23.2 255.255.255.252 N/A

PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1

PC-B NIC 192.168.2.3 255.255.255.0 192.168.2.1

PC-C NIC 192.168.3.3 255.255.255.0 192.168.3.1

Objectives

Part 1: Build the Network and Load Device Configurations

Part 2: Troubleshoot EIGRP

Background / Scenario

The Enhanced Interior Gateway Routing Protocol (EIGRP) has advanced features to allow changes related to
summarization, default route propagation, bandwidth utilization, metrics, and security.

In this lab, you will troubleshoot a network that is running EIGRP. Advanced EIGRP features have been
implemented, but the network is now experiencing problems. You are tasked with finding and correcting the
network issues.

Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with
Cisco IOS, Release 15.2(4)M3 (universalk9 image). Other routers and Cisco IOS versions can be used.
Depending on the model and Cisco IOS version, the commands available and output produced might vary

Lab – Troubleshooting Advanced EIGRP

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from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the
correct interface identifiers.

Note: Ensure that the routers have been erased and have no startup configurations. If you are unsure,
contact your instructor.

Required Resources

 3 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)

 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

 Console cables to configure the Cisco IOS devices via the console ports

 Ethernet cables as shown in the topology

Part 1: Build the Network and Load Device Configurations

Step 1: Cable the network as shown in the topology.

Step 2: Configure PC hosts.

Step 3: Load router configurations.

Load the following configurations into the appropriate router. All routers have the same passwords. The
privileged EXEC password is class, and cisco is the console and vty password.

Router R1 Configuration:

conf t

hostname R1

enable secret class

no ip domain lookup

key chain EIGRP-KEYS

key 1

key-string cisco123

line con 0

password cisco

login

logging synchronous

line vty 0 4

password cisco
login

banner motd @

Unauthorized Access is Prohibited! @

interface lo1

description Connection to Branch 11

ip add 172.16.11.1 255.255.255.0

interface lo2

description Connection to Branch 12

ip add 172.16.12.1 255.255.255.0

interface lo3

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description Connection to Branch 13

ip add 172.16.13.1 255.255.255.0

interface lo4

description Connection to Branch 14

ip add 172.16.14.1 255.255.255.0

interface g0/0

description R1 LAN Connection

ip add 192.168.1.1 255.255.255.0

no shutdown

interface s0/0/0

description Serial Link to R2

clock rate 128000

ip add 192.168.12.1 255.255.255.252

ip authentication mode eigrp 1 md5

ip authentication key-chain eigrp 1 EIGRP-KEYS

ip hello-interval eigrp 1 30

ip hold-time eigrp 1 90

ip bandwidth-percent eigrp 1 40

no shutdown

interface s0/0/1

description Serial Link to R3

bandwidth 128

ip add 192.168.13.1 255.255.255.252

ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP-KEYS
ip bandwidth-percent eigrp 1 40
no shutdown

router eigrp 1

router-id 1.1.1.1

network 192.168.1.0 0.0.0.255

network 192.168.12.0 0.0.0.3

network 192.168.13.0 0.0.0.3

network 172.16.0.0 0.0.255.255

passive-interface g0/0

auto-summary

end

Router R2 Configuration:

conf t

hostname R2

enable secret class
no ip domain lookup
key chain EIGRP-KEYS
key 1

key-string Cisco123

line con 0

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password cisco
login
logging synchronous
line vty 0 4
password cisco
login
banner motd @
Unauthorized Access is Prohibited! @
interface g0/0

description R2 LAN Connection

ip add 192.168.2.1 255.255.255.0

no shutdown
interface s0/0/0

description Serial Link to R1

bandwidth 128

ip add 192.168.12.2 255.255.255.252

ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP-KEYS
ip bandwidth-percent eigrp 1 40
ip hello-interval eigrp 1 30
ip hold-time eigrp 1 90
no shutdown
interface s0/0/1
description Serial Link to R3
bandwidth 128

ip add 192.168.23.1 255.255.255.252

ip authentication mode eigrp 1 md5
ip bandwidth-percent eigrp 1 40
ip hello-interval eigrp 1 30
ip hold-time eigrp 1 90
no shutdown

interface lo0

ip add 209.165.200.225 255.255.255.252

description Connection to ISP

router eigrp 1

router-id 2.2.2.2

network 192.168.2.0 0.0.0.255

network 192.168.12.0 0.0.0.3

network 192.168.23.0 0.0.0.3

passive-interface g0/0

ip route 0.0.0.0 0.0.0.0 lo0

end

Router R3 Configuration:

conf t

hostname R3

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enable secret class
no ip domain lookup
key chain EIGRP-KEYS
key 1
key-string Cisco123
line con 0
password cisco
login
logging synchronous
line vty 0 4
password cisco
login
banner motd @
Unauthorized Access is Prohibited! @

interface lo3

description Connection to Branch 33

ip add 172.16.33.1 255.255.255.0

interface lo4

description Connection to Branch 34

ip add 172.16.34.1 255.255.255.0

interface lo5

description Connection to Branch 35

ip add 172.16.35.1 255.255.255.0

interface lo6

description Connection to Branch 36

ip add 172.16.36.1 255.255.255.0

interface g0/0

description R3 LAN Connection

ip add 192.168.3.1 255.255.255.0

no shutdown
interface s0/0/0
description Serial Link to R1

ip add 192.168.13.2 255.255.255.252

ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP-KEYS
ip hello-interval eigrp 1 30
ip hold-time eigrp 1 90
clock rate 128000
bandwidth 128
no shutdown
interface s0/0/1
description Serial Link to R2
bandwidth 128

ip add 192.168.23.2 255.255.255.252

ip authentication mode eigrp 1 md5

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ip authentication key-chain eigrp 1 eigrp-keys

! ip bandwidth-percent eigrp 1 40

ip hello-interval eigrp 1 30
ip hold-time eigrp 1 90
no shutdown
router eigrp 1

router-id 3.3.3.3

network 192.168.3.0 0.0.0.255

network 192.168.13.0 0.0.0.3
network 192.168.23.0 0.0.0.3
network 172.16.0.0 0.0.255.255
passive-interface g0/0
auto-summary
end

Step 4: Verify end-to-end connectivity.

Note: It may be necessary to disable the PC firewall to ping between PCs.

Step 5: Save the configuration on all routers.

Part 2: Troubleshoot EIGRP

In Part 2, verify that all routers have established neighbor adjacencies, and that all network routes are
available.

Additional EIGRP Requirements:

 All serial interface clock rates should be set at 128 Kb/s and a matching bandwidth setting should be

available to allow EIGRP cost metrics to be calculated correctly.

 Manual route summarization of the branch networks, simulated by using Loopback interfaces on R1 and

R3, should be utilized. The automatic summarization feature of EIGRP should not be used.

 EIGRP should redistribute the static default route to the Internet. This is simulated by using Loopback

interface 0 on R2.

 EIGRP should be configured to use no more than 40 percent of the available bandwidth on the serial

interfaces.

 EIGRP Hello/Hold timer intervals should be set to 30/90 on all serial interfaces.

 All serial interfaces should be configured with MD5 authentication, using key chain EIGRP-KEYS, with a

key-string of Cisco123.

List the commands used during your EIGRP troubleshooting process:

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List the changes made to resolve the EIGRP issues. If no problems were found on the device, then respond
with “no problems were found”.

R1 Router:

R2 Router:

R3 Router:

Reflection

1. How can the auto-summary command create routing issues in EIGRP?

2. What advantages are provided by manually summarizing the branch routes (loopback interfaces on R1 and
R3) in this network?

3. Why would you want to change the EIGRP Hello and Hold time intervals on an interface?

Lab – Troubleshooting Advanced EIGRP

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Router Interface Summary Table

Router Interface Summary

Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2

1800 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

1900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2801 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/1/0 (S0/1/0) Serial 0/1/1 (S0/1/1)

2811 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many
interfaces the router has. There is no way to effectively list all the combinations of configurations for each router
class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.
The table does not include any other type of interface, even though a specific router may contain one. An
example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be
used in Cisco IOS commands to represent the interface.

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Lab – Troubleshooting Advanced Single-Area OSPFv2

Topology

Lab – Troubleshooting Advanced Single-Area OSPFv2

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Addressing Table

Device Interface IP Address Subnet Mask Default Gateway

R1 G0/0 192.168.1.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.12.1 255.255.255.252 N/A

S0/0/1 192.168.13.1 255.255.255.252 N/A

R2 Lo0 209.165.200.225 255.255.255.252 N/A

S0/0/0 192.168.12.2 255.255.255.252 N/A

S0/0/1 (DCE) 192.168.23.1 255.255.255.252 N/A

R3 G0/0 192.168.3.1 255.255.255.0 N/A

S0/0/0 (DCE) 192.168.13.2 255.255.255.252 N/A

S0/0/1 192.168.23.2 255.255.255.252 N/A

PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1

PC-C NIC 192.168.3.3 255.255.255.0 192.168.3.1

Objectives

Part 1: Build the Network and Load Device Configurations

Part 2: Troubleshoot OSPF

Background / Scenario

OSPF is a popular routing protocol used by businesses worldwide. A Network Administrator should be able to
isolate OSPF issues and resolve those issues in a timely manner.

In this lab, you will troubleshoot a single-area OSPFv2 network and resolve all issues that exist.

Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with
Cisco IOS Release 15.2(4)M3 (universalk9 image). Other routers and Cisco IOS versions can be used.
Depending on the model and Cisco IOS version, the commands available and output produced might vary
from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the
correct interface identifiers.

Note: Make sure that the routers have been erased and have no startup configurations. If you are unsure,
contact your instructor.

Required Resources

 3 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)

 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

 Console cables to configure the Cisco IOS devices via the console ports

 Ethernet and serial cables, as shown in the topology

Part 1: Build the Network and Load Device Configurations

In Part 1, you will set up the network topology and configure basic settings on the PC hosts and routers.

Lab – Troubleshooting Advanced Single-Area OSPFv2

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Step 1: Cable the network as shown in the topology.

Step 2: Configure PC hosts.

Step 3: Load router configurations.

Load the following configurations into the appropriate router. All routers have the same passwords. The
privileged EXEC password is class. The password for console and vty lines is cisco.

Router R1 Configuration:

conf t

hostname R1

enable secret class

no ip domain lookup

interface GigabitEthernet0/0

ip address 192.168.1.1 255.255.255.0

duplex auto

speed auto

no shut

interface Serial0/0/0

bandwidth 128

ip address 192.168.12.1 255.255.255.252

ip ospf message-digest-key 1 md5 MD5LINKS

clock rate 128000

no shut

interface Serial0/0/1

bandwidth 64

ip ospf message-digest-key 1 md5 MD5LINKS

ip address 192.168.13.1 255.255.255.252

no shut

router ospf 1

auto-cost reference-bandwidth 1000

area 0 authentication message-digest

passive-interface g0/0

network 192.168.1.0 0.0.0.255 area 0

network 192.168.12.0 0.0.0.3 area 0

network 192.168.13.0 0.0.0.3 area 0

banner motd

^

Unauthorized Access is Prohibited!

^

line con 0

password cisco

logging synchronous

login

line vty 0 4

password cisco

login

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transport input all

end

Router R2 Configuration:

conf t

hostname R2

enable secret class
no ip domain lookup

interface Loopback0

ip address 209.165.200.225 255.255.255.252

interface Serial0/0/0

bandwidth 182

ip ospf message-digest-key 1 md5 MD5LINKS

ip address 192.168.12.2 255.255.255.252

no shut
interface Serial0/0/1
bandwidth 128
ip ospf message-digest-key 1 md5 MD5LINKS

ip address 192.168.23.1 255.255.255.252

clock rate 128000
no shut
router ospf 1

router-id 2.2.2.2

auto-cost reference-bandwidth 1000
area 0 authentication message-digest
passive-interface g0/0
network 192.168.12.0 0.0.0.3 area 0

network 192.168.23.0 0.0.0.3 area 0

ip route 0.0.0.0 0.0.0.0 Loopback0

banner motd ^

Unauthorized Access is Prohibited!
^
line con 0
password cisco
logging synchronous
login
line vty 0 4
password cisco
login
transport input all
end

Router R3 Configuration:

conf t

hostname R3

enable secret class

Lab – Troubleshooting Advanced Single-Area OSPFv2

© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 5 of 7

no ip domain lookup
interface GigabitEthernet0/0

ip address 192.168.3.1 255.255.255.0

duplex auto
speed auto
no shut
interface Serial0/0/0
bandwidth 128
ip ospf message-digest-key 1 md5 MD5LINKS

ip address 192.168.13.2 255.255.255.252

clock rate 128000
no shut
interface Serial0/0/1
bandwidth 128

ip address 192.168.23.2 255.255.255.252

no shut
router ospf 1

router-id 3.3.3.3

area 0 authentication message-digest
passive-interface g0/0

network 192.168.3.0 0.0.0.255 area 0

network 192.168.13.0 0.0.0.3 area 0
network 192.168.23.0 0.0.0.3 area 0
banner motd ^
Unauthorized Access is Prohibited!
^
line con 0
password cisco
logging synchronous
login
line vty 0 4
password cisco
login
transport input all
end

Step 4: Test end-to-end connectivity.

All interfaces should be up and the PCs should be able to ping the default gateway.

Part 2: Troubleshoot OSPF

In Part 2, verify that all routers have established neighbor adjacencies, and that all network routes are
available.

Additional OSPF Requirements:

 Each router should have the following router ID assignments:

Lab – Troubleshooting Advanced Single-Area OSPFv2

© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 6 of 7

– R1 Router ID: 1.1.1.1

– R2 Router ID: 2.2.2.2

– R3 Router ID: 3.3.3.3

 All serial interface clocking rates should be set at 128 Kb/s and a matching bandwidth setting should be

available to allow OSPF cost metrics to be calculated correctly.

 The 1941 routers have Gigabit interfaces, so the default OSPF reference bandwidth should be adjusted

to allow cost metrics to reflect appropriate costs for all interfaces.

 OSPF should propagate a default route to the Internet. This is simulated by using Loopback interface 0

on R2.

 All interfaces advertising OSPF routing information should be configured with MD5 authentication, using

MD5LINKS as the key.

List the commands used during your OSPF troubleshooting process:

List the changes made to resolve the OSPF issues. If no problems were found on the device, then respond
with “no problems were found”.

R1 Router:

R2 Router:

R3 Router:

Reflection

How would you change the network in this lab so all LAN traffic was routed through R2?

Lab – Troubleshooting Advanced Single-Area OSPFv2

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Router Interface Summary Table

Router Interface Summary

Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2

1800 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

1900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2801 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/1/0 (S0/1/0) Serial 0/1/1 (S0/1/1)

2811 Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

2900 Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many
interfaces the router has. There is no way to effectively list all the combinations of configurations for each router
class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.
The table does not include any other type of interface, even though a specific router may contain one. An
example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be
used in Cisco IOS commands to represent the interface.

TextField1: