Scenario 101 Answers

1 Issue the configuration commands for the RIP network to be redistributed on Router A into EIGRP.

The commands are as follows:

router eigrp 300 network 210.77.8.0 redistribute rip default-metric 10000 100 255 1 1500

2 Ensure that the interfaces running EIGRP do not have RIP updates generated through them or that the RIP interfaces do not have EIGRP updates running through them.

To ensure this:

router eigrp 300 network 210.77.8.0 redistribute rip default-metric 10000 100 255 1 1500

passive interface s0.2

router rip network 201.77.10.0

passive interface s0.1

passive interface s0.3

passive interface e0

passive interface e1

3 The site running IGRP and the site running EIGRP are running different autonomous system numbers. How would you implement a transition to both sites running EIGRP using the same autonomous system number?

There are several ways to transition from different autonomous systems to one autonomous system so that IGRP and EIGRP automatically redistribute. The methods include the following:

• Configuring redistribution at both sites and in a controlled manner, during down time switching all the routers in the IGRP site to the same autonomous system as that of EIGRP. Because the prevailing routing protocol is to be EIGRP, it makes sense that IGRP is the protocol to change the autonomous system number. When this is working, the same approach could be made to switch to EIGRP in the IGRP site.

• Another approach, and one favored by many, is to configure EIGRP with the same autonomous system number on all routers at the IGRP site. As part of the configuration, increase the administrative distance of EIGRP to be 200 so that none of the routes is acceptable to the routing process. Then during down time on the systems, cut over to the EIGRP process by changing its administrative distance back to the default of 90. This can be done by simply adding the word no in front of the existing command. The beauty of this plan is that everything can be put in place before the cutover; if problems are experienced, it is equally easy to reverse the command to return to the IGRP configuration.

4 The OSPF redistribution into RIP has been implemented, but users are complaining about delays. State the first step that you would take to verify the configuration.

The first step is to issue the following commands:

• show ip route—To ensure that each routing process sees the appropriate paths. A routing loop might be visible here.

• extended ping—To see the path that is taken to the remote locations. A routing loop could be detected.

• show ip protocols—To see how RIP and OSPF are being redistributed, what the default metrics are, and whether there any distribute lists are impeding the flow of updates.

• show ip ospf database—To ensure that all the routes are in place. Again, errors leading to a routing loop could be detected here.

• show ip ospf neighbor—To ensure that OSPF can still see the adjacent routers.

5 The CIO has been asked to submit a transition plan to the board of trustees that includes a reasoned explanation for the need for redistribution. What should it look like?

It should include the following:

The transition would happen at the main site where the centralized records and databases are maintained. This is because this site must be the most stable because it servers the other sites.

The next step would be to review the addressing scheme to ensure that it was hierarchical and could support summarization and VLSM.

The redistribution between IGRP and EIGRP is the easiest to effect and should be performed in accordance to the answer in question 3.

Because the equipment for RIP and OSPF machines may not support EIGRP, a careful assessment should be done, and plans should be made to upgrade the equipment as necessary. However, the network administrator should be reminded that it is not necessary for hosts to run RIP. If hosts run RIP it can lead to a very unstable network. Therefore all hosts should be configured with a default gateway address.

For this last point alone, it is necessary to have redistribution configured in the network to ensure the full connectivity throughout the campuses.

When redistribution is in place, centralization of resources and maintenance of the data and network can be implemented, granting a full exchange of information throughout the hospital to harness the power of the information available.

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