EIGRP Lab | EIGRP Lab - Answers

    Hello! Today I want to share with the reputable community the labs that helped me prepare for the ROUTE exam from the new CCNP track, as well as thoughts and impressions from the exam. Due to the fact that there is a lot of material and lab, you will have to break it all into portions and lay them out in turn. Today I propose to talk about CCNP version 6 in general, about the ROUTE exam and look at the EIGRP labs that I used to prepare for the exam.

    If you are interested, welcome to cat!

    CCNP v.6

    By changing CCNPs last summer, Cisco pursued several goals. In addition to technology updates, CCNP was supposed to be a real “bridge” between CCNA and CCIE. CCNP version 5 was closer to CCNA than CCIE - it was also possible to find the phrases “you can read more about OSPF here” and “more about this protocol feature in the CCIE course”. And in it, as in CCNA, there were many topics that were not directly related to routing and switching.

    As a result, as all of us beloved Jeremy Chara tells his opinion about students, the average person received CCNP, looked at CCIE and saw an abyss in front of him. His hands fell and he lost the belief that all the material that separated CCNP from CCIE could be learned at all.

    Changing CCNP, Cisco took this fact into account. Almost everything that does not concern Routing & Switching is excluded from the course - it is excluded and transferred to the corresponding directions of Professional certificates. VoIP has become part of CCNP Voice, Wi-Fi has become part of CCNP Wireless, and so on. The remnants of former luxury in the course now relate to access technologies and VPNs, being more of a brief overview than a full-fledged topic.

    But the switching and routing required to build an enterprise network is fully covered. You will no longer see a link to the Cisco website regarding EIGRP or OSPF - from a technological point of view, the course covers these protocols from start to finish. CCNP has become more complex and more specialized. Now it includes only switching and routing, but in this direction - R&S - it really is halfway from CCNA to CCIE.

    642-902 ROUTE

    Of all the three new CCNP exams, it is ROUTE, the successor to BSCN, that is the most voluminous and the most complex. It is included in several certification tracks: CCNP, CCDP and CCIP, covering the Interior Gateway Routing Protocols in full, giving the basics of BGP and introducing the reader to IPv6 at a sufficient level to understand the functioning of routing using it. The Official Certification Guide for preparing for ROUTE is a book of more than 900 pages of text, plus it is highly advisable to study the Foundation Learning Guide - another 700 pages.

    And, of course, practice.

    I was preparing for the exam mainly using GNS3. I have a home lab with real Cisco Systems equipment, but in my opinion, GNS3 is more convenient. Functionally, a lab in GNS3 is no different from a lab on real hardware. GNS3 is more convenient in terms of viewing traffic - no need to suffer with port mirroring if you want to see traffic on a link. And besides, GNS3 is always with you, wherever you are - at work, on a business trip, on vacation. If you want to experiment with your routers, all you need is a laptop and GNS3.

    The exam is difficult, but it is very, very good! True. Of course, there are several controversial and damp questions, there are glitches with simlets (still, simlets of such a level!), But the exam itself is simply wonderful! There are no obvious questions at all. “Head-on” questions in the style of “what is the maximum length of a 100BASE-T segment” are just a couple of pieces. The vast majority of issues are scenarios. Questions are formulated in the style of “we already believe that you know the theory of OSPF and EIGRP, you better tell us what will happen if we add one link in this topology? And if here to fix the command like this? And if you make such a change here? But in such a topology and with such a configuration, what will be in the routing table? ”

    The simlets are especially good. They no longer contain items to be completed, as was the case in CCNA. Now the script is a rather abstract description of customer requirements. No points. Just text. How to build a configuration so that it meets these requirements is up to you. Moreover, there are several options for solving the problem. Which one is more correct - this is, as I understand it, each person must decide on the exam independently.

    The first time I failed my ROUTE. It is because of the simlets. Some of their glitches took too much time, and one of them, I suspect, did not count me because of the peculiarities of implementation. After the exam, I wrote to the Cisco Certification Support Community, where their experts very quickly requested a test from VUE, looked at the results, agreed with my arguments and issued a voucher for a free reissue. Truly, this is truly a company with the principle of “Customer as a Strategy” :-) Therefore, I would recommend that you describe the simlet glitches encountered in the comments, and if you suspect that you might not be credited with points for the correct answer, do not hesitate to write in Cisco, it is very pleasant to deal with them.


    The exam covers the following features of EIGRP technology:
    • EIGRP timers, neighborhood relations, neighborhood management and network convergence
    • Authorization of neubes in EIGRP
    • EIGRP metric, DUAL features, choice of successors and feasible successors
    • Default Network Concept
    • Route Summarization and Route Filtering
    • Bandwidth control
    • Stub routers
    • Traffic balancing on routes with different metrics

    For preparation, I used the following lab:


    Download the GNS3 topology with configs here . I used IOS c2600-ipbasek9-mz. If your startup config does not load automatically, apply it manually (right-click on the router, startup-config).

    Again, I have official Cisco labs to prepare for ROUTE, but from my point of view it is always more interesting to build the lab yourself. In the process of building, a bunch of interesting glitches will surely come up, with which it will be interesting to tinker with :-)

    I am deeply convinced that it is best to understand the technology by solving all sorts of bugs (hello to the TSHOOT exam) and looking for information about strange things on your own, therefore I offer you several puzzles inherent in this configuration. With their help, you can check whether you know EIGRP at the CCNP level.
    1. Why can't a Hub router establish an EIGRP neighborhood with Spoke 2? Fix it.
    2. How to watch Hello timer on Serial0 / 0.202 interface of MainOfficeHub router? Which team to see the value of the Dead timer?
    3. Will EIGRP lose its proximity to Spoke routers if I change the Hello timer value on the Hub router for 5 seconds? And if in 120 seconds? What will be the Dead timer value of the Hub Router if you set the Hello interval to 5 seconds? How to check it?
    4. Now the Spoke3 interface of the router and the Hub router sub-interface connected to it are located on the network and have the addresses .1 and .2, respectively. If I change the address mask of the Spoke router interface to / 30, will the EIGRP neighborhood remain?
    5. and - loopback addresses of the Spoke 1 and Spoke 2 routers interfaces, respectively. Both networks are visible on the Hub router, but Spoke 1 does not see the network on, and Spoke 2 does not see At the same time, they see the other networks (for example, the network of the Spoke 3 router) normally. Why is this happening and how to fix this situation?
    6. Spoke 1 and Spoke 2 routers are configured as eigrp stub, but the networks of their loopback interfaces are still announced by the hub router. Why is this so and how to do it so that they do not announce anything?
    7. If the hub router loses the link to the network, where will it send EIGRP Query and why?
    8. How much maximum bandwidth of the link to Spoke 3 can EIGRP packets take?
    9. EIGRP authentication is configured between the Hub router and R5, but the routers cannot establish the neighborhood. At the same time, on the Hub router, the proximity to R5 is either established or lost. What is the reason for this and how to eliminate it?
    10. ASBR has an Internet connection through the loopback 4 interface with the address It is necessary to announce by EIGRP default route to this network.
    11. The summary route for the ​​network is configured on the Hub router. Why is its metric set to 2169856?
    12. Due to the automatic route summation, the network of the Loopback 1 interface of the Spoke 1 router and the Loopback network 0 - 3 of the ASBR router are announced as the same networks Where it is necessary to remove the automatic summation so that they all network routers see them as different networks?
    13. On the Hub router, traffic balancing on routes with different metrics is configured. The coefficient is variance 2. As can be seen from the EIGRP topology table (and from the diagram), the metrics of the two routes are of the order of 15000 and 16000, but despite this, only one is set in the routing table. Why did this happen?

    I hope the lab will be useful to those who are preparing for CCNP and those who, perhaps, want to refresh some features of EIGRP. In the next topic I will definitely give a brief comment on each of the points.

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