OSPF Migration Lab Work

ASNT Lab Work

OSPF Routing
Introduction
OSPF Migration Lab Part 1
OSPF Migration Lab Part 2
OSPF Migration Lab Part 3
OSPF Routing Lab Part 4
OSPF Routing Lab Part 5
OSPF Routing Lab Part 6
Reflection
Further work

For ALL lab work in this course, you are expected to keep notes of the labs/workshops in a Log Book.
Your Log Books will be assessed during this course and will be handed in at the end of the course.
They may be analogue or digital in nature.

Introduction

Today's work is to migrate a given OSPF network to EIGRP.

You will need to download the file ospf-for-eigrp-migration.pkt

OSPF Routing Lab Part 1

Open Packet Tracer 5.0

Open your copy of ospf-for-eigrp-migration.pkt

Save your network as ospf-for-eigrp-migration.pkt

The current network

The file that you have downloaded is currently running Single Area OSPF. Your task is to migrate this network to EIGRP with NO LOSS of routing during the migration.

Here we will migrate our network to EIGRP by ADDING EIGRP routing to the existing OSPF configuration, testing the EIGRP then DELETING the OSPF routing configs.

1. Firstly we will need to decide on an Autonomous System Number. This can be any number from 1 to 65535.

You will need to use this same AS number on all EIGRP processes within your network. Here I have chosen AS number 5122.

Finance(config)#router eigrp 5122

2. Now add all connected networks that were originally routed by OSPF.

3. There is a show command that will be able to provide this information easily - which command is this?

As you add the networks for EIGRP, you will see adjacencies being formed.

Check regularly that the routing table contains routes learned via EIGRP.

4. Which letter will prefix the EIGRP learned routes?

You can display the routing table without haviing to return to Priveleged Exec mode by using the following syntax:

Finance(config-router)#do 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, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is not set

     172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks
D       172.16.0.0/16 is a summary, 00:10:15, Null0
C       172.16.0.0/30 is directly connected, Serial0/0
C       172.16.0.4/30 is directly connected, Serial0/1
O       172.16.0.8/30 [110/128] via 172.16.0.2, 01:09:15, Serial0/0
D       172.16.0.12/30 [90/2681856] via 172.16.0.6, 00:10:27, Serial0/1
C       172.16.0.16/30 is directly connected, Serial0/2
O    202.22.20.0/24 [110/65] via 172.16.0.2, 01:09:15, Serial0/0
     202.22.21.0/24 is variably subnetted, 4 subnets, 3 masks
D       202.22.21.0/24 is a summary, 00:10:15, Null0
O       202.22.21.0/25 [110/129] via 172.16.0.2, 01:09:15, Serial0/0
                       [110/129] via 172.16.0.6, 01:09:05, Serial0/1
C       202.22.21.128/26 is directly connected, FastEthernet0/0
O       202.22.21.192/26 [110/65] via 172.16.0.6, 01:09:15, Serial0/1

Check that you can see all networks in the routing table.

5. Use the command show ip protocols - you should receive output similar to that shown below:

Finance(config-router)#do sh ip pro

Routing Protocol is "eigrp 51 "
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 metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 51
Automatic network summarization is in effect
Automatic address summarization:
Maximum path: 4
Routing for Networks:
     172.16.0.0/30
     172.16.0.4/30
     172.16.0.16/30
     202.22.21.128/26
Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.0.18     90            9271363
    172.16.0.6      90            9290535
Distance: internal 90 external 170

Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 202.22.21.129
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
    172.16.0.1 0.0.0.0 area 0
    172.16.0.7 0.0.0.0 area 0
    172.16.0.5 0.0.0.0 area 0
    202.22.21.129 0.0.0.0 area 0
Passive Interface(s):
    FastEthernet0/0
Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.0.2           110      00:10:34
    172.16.0.6           110      00:10:35
Distance: (default is 110)

If you do not receive similar output, troubleshoot as necessary.

Make notes as to the 'Distance' of each of the two routing protocols. This is known as the Administrative Distance. What is the numerical difference between the distances?

6. What is the importance of the Administrative Distance? Use a search engine if you are not sure.

7. In the output above note the highlighted line Automatic network summarization is in effect

This is an attempt to make the routing tables shorter by the router. Here this will cause us problems so we need to turn this off.

8. Make a copy of the routing tables for all FOUR routers.

For all routers, enter the following commands

Router(config)#router eigrp 5122
Router(config-router)#no auto-summary

9. Make a copy of all the routing tables again for all FOUR routers and notice the differences now that there is no address autosummarization in progress.

Make notes in your Log Book

Save your network!

When you have finished this part, you may proceed.

OSPF Migration Lab Part 2

Tidying up the Routing

Now you will remove OSPF from each router.

1. Enter each router's CLI tean type: enable, then configure terminal.

2. Type no router ospf [process id].

3. Enter the command do show ip protocols

4. Which routing protocols are now in use? Why do you think this has happened? Make notes.

5. What is the router's current command prompt? What command mode are you in? How did you manage to get the output from a priv exec command?

Discuss with your colleagues possible reasons for your results above.

6. Type do show ip route. How many networks are being reported by EIGRP?

7. Check you have full connectivity.

Make notes in your Log Book

When you have finished this part, you may proceed.

Save your network again!

OSPF Migration Lab Part 3

More Routing Tidying

Whenever a routing update or Hello message is sent, it is multicast to all other routers via every router interface. How many routers can be reached via the Fast Ethernet interfaces of the routers (except for the directly attached routers themselves)?

1. What are the consequences (if any) of sending routing information via an interface that does not lead to another router?

2. Enter each router's CLI then type: enable, then configure terminal.

3. Enter the EIGRP routing process.

4. Type passive-interface FastEthernet 0/0

5. Do you think that this is good or bad for the network?

Discuss with your colleagues.

Make notes in your Log Book

When you have finished this part, you may proceed.

Save your network again!

Reflection

Now that you have created a fully operational EIGRP routed network with four campuses, you should be able to describe the necessary steps required for migration from one routing protocol to another.

Discuss this with a lab partner so that you are fully aware of the steps that are required to carry out the migration so that no loss of connectivity occurs for the end users..

Make brief notes in your Log Book concerning the necessary steps for the EIGRP network migration.

Further Work (optional)

Now that you have a fully operational EIGRP routed VLAN, save your network with a different name.

Save your network as ospf-for-eigrp-migration-extra.pkt

Give descriptions to all interfaces
Add ACLs to prevent students from accessing either Staff or Admin VLANs from any location.
Check for full connectivity when you have finished
Check your routing tables.

Remember to SAVE your work regularly.