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EIGRP Stub Sim

May 8th, 2014 in Lab Sim, LabSim Go to comments

Question

TUT Corporation has just extended their business. R3 is the new router from which they can reach all Corporate subnets. In order to raise network stableness and lower the memory usage and broadband utilization to R3, TUT Corporation makes use of route summarization together with the EIGRP Stub Routing feature. Another network engineer is responsible for this solution. However, in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been missing.

EIGRPStubSim

Presently TUT has configured EIGRP on all routers in the network R2, R3, and R4. Your duty is to find and solve the connectivity failure problem with the remote office router R3. You should then configure route summarization only to the distant office router R3 to complete the task after the problem has been solved.

The success of pings from R4 to the R3 LAN interface proves that the fault has been corrected and the R3 IP routing table only contains two 10.0.0.0 subnets.

Answer and Explanation:

First we have to figure out why R3 and R4 can not communicate with each other. Use the show running-config command on router R3

EIGRPStubSim_show_running_config_R3

Notice that R3 is configured as a stub receive-only router. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system. This keyword will also prevent any type of route from being sent.

Therefore we will remove this command and replace it with the eigrp stub command:

R3#configure terminal
R3(config)#router eigrp 123
R3(config-router)#no eigrp stub receive-only
R3(config-router)#eigrp stub
R3(config-router)#end

Now R3 will send updates containing its connected and summary routes to other routers. Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default.

Next we will configure router R3 so that it has only 2 subnets of 10.0.0.0 network. Use the show ip route command on R3 to view its routing table

R3#show ip route

EIGRPStubSim_show_ip_route_R3_no-summary.jpg

 

Because we want the routing table of R3 only have 2 subnets so we have to summary sub-networks at the interface which is connected with R3, the s0/0 interface of R4.

There is one interesting thing about the output of the show ip route shown above: the 10.2.3.0/24, which is a directly connected network of R3. We can’t get rid of it in the routing table no matter what technique we use to summary the networks. Therefore, to make the routing table of R3 has only 2 subnets we have to summary other subnets into one subnet.

In the output if we don’t see the summary line (like 10.0.0.0/8 is a summary…) then we should use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 so that all the ping can work well.

In conclusion, we will use the ip summary-address eigrp 123 10.2.0.0 255.255.0.0 at the interface s0/0 of R4 to summary.

R4>enable
R4#configure terminal
R4(config)#interface s0/0
R4(config-if)#ip summary-address eigrp 123 10.2.0.0 255.255.0.0

Now we jump back to R3 and use the show ip route command to verify the effect, the output is shown below:

EIGRPStubSim_show_ip_route_R3_final_no_summary.jpg

(But please notice that the ip addresses and the subnet masks in your real exam might be different so you might use different ones to solve this question)

But in your real exam, if you see the line “10.0.0.0/8 is a summary,….Null0” then you need to summary using the network 10.0.0.0/8 with the command “ip summary-address eigrp 123 10.0.0.0 255.0.0.0” . This configuration is less optimize than the first but it summaries into 2 subnets as the question requires (maybe you will not see this case, don’t worry!).

The command “copy running-config startup-config” will not work so try using this command; just skip if it doesn’t work.

 

Other lab-sims on this site:

OSPF Sim

EIGRP OSPF Redistribution Sim

IPv6 OSPF Virtual Link Sim

EIGRP Simlet
Policy Based Routing Sim

Comments
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  1. Anonymous
    August 25th, 2017

    I meant dont use dumps..all outdated

  2. shanu
    August 25th, 2017

    Anonymous can you share the dumps that you have plz

  3. Netw
    August 25th, 2017

    If you want gns3 lab for mpls vpnv4, check this
    https://garziadmostafa.wordpress.com/2017/08/21/mpls-vpnv4-configuration/

  4. faheem
    August 31st, 2017

    i want ccnp route labs for practice from digitaltut can not dowaloaded ,,,,from where i download please help me in exam 1 month req only please

  5. Cool-Guy
    September 6th, 2017

    Hello

    The bit I struggle to understand is “10.0.0.0/8 is a summary,….Null0” if the route in routing tabel is already summarized as “10.0.0.0/8 is a summary,….Null0” and Null0 is garbage can- so how can we still summarize by using

    to summary using the network 10.0.0.0/8 with the command “ip summary-address eigrp 123 10.0.0.0 255.0.0.0” .

  6. vlaximir
    September 7th, 2017

    why the route L (Local)
    10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
    D 10.0.0.0/8 [90/307200] via 10.2.3.4, 00:09:55, Ethernet0/0
    C 10.2.3.0/24 is directly connected, Ethernet0/0
    L 10.2.3.3/32 is directly connected, Ethernet0/0
    172.16.0.0/32 is subnetted, 1 subnets
    C 172.16.1.1 is directly connected, Loopback10

  7. Cool-Guy
    September 8th, 2017

    Hello
    The bit I struggle to understand is “10.0.0.0/8 is a summary,….Null0” if the route in routing tabel is already summarized as “10.0.0.0/8 is a summary,….Null0” and Null0 is garbage can- so how can we still summarize by using
    to summary using the network 10.0.0.0/8 with the command “ip summary-address eigrp 123 10.0.0.0 255.0.0.0”

  8. marek
    September 18th, 2017

    Hi Everyone,
    Can someone share valid dumps?
    marekmarek062 gmail.com
    Thanks

  9. patri
    September 20th, 2017

    Can someone plz share valid dumps av exam in a month.
    my email is patriccna at gmail.com

    thanks

  10. unreal
    October 26th, 2017

    ip summary-address eigrp 123 10.2.0.0 255.255.240.0 (/20) is more optimal summary address.

  11. Chikku
    October 29th, 2017

    Anyone who took the exam recently can confirm which are the SIMs in the exam?????
    I’m gonna take it early next week.
    Please respond asap.

  12. Goldy
    October 31st, 2017

    Can someone please send me 539q dumps. My email is sarab.jeet11 at g mail dot com.

  13. Vox
    November 6th, 2017

    @unreal You are correct. This the optimal summary address according to theory. Tested and working.
    Reference:
    http://www.ciscopress.com/articles/article.asp?p=174107&seqNum=3

  14. LR
    December 26th, 2017

    @unreal and Vox

    After the configs, I still get 3 subnets as shown in below output. Can you please explain why?

    10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
    D 10.2.0.0/20 [90/2170112] via 10.2.3.4, 00:00:22, Serial2/0
    C 10.2.3.0/24 is directly connected, Serial2/0
    L 10.2.3.3/32 is directly connected, Serial2/0

  15. khan
    January 11th, 2018

    Dear All,

    I want to prepare for CCNP route kindly send me a valid dumps if you have please
    {email not allowed}

  16. khan
    January 11th, 2018

    www. {email not allowed}

  17. Anonymous
    January 18th, 2018
  18. Przemek
    January 23rd, 2018

    Hi All, Passed today 905 pts.
    About 5 newer questions then on digital.tut.
    On EIGRP Stub SIM there was no Null0 to summarise so I summarised 10.2.0.0 255.255.240.0 and…nothing happened. So I tried again with 10.2.0.0 255.255.0.0 and I had 2 separated subnets for 10.0.0.0 network so goal was achieved.
    I learnt from digitaltut and IT Libraries dated 07.2017 (417q).

  19. nurwan
    January 24th, 2018

    please Przemek, could you share your IT Libraries dump to my email nurwanreza79(at)gmail(dot)com.thanks in advance.

  20. Mac
    February 5th, 2018

    Hello can someone please tell me where can i download this lab? Thank you

  21. Sims
    February 17th, 2018

    Just made an EIGRP Stub lab…
    h t t p s://file.io/NthIcI

  22. Sims
    February 17th, 2018

    The image of the router in the Sim I created above is: c7200-jk9s-mz.124-13b.image

  23. WAX
    February 28th, 2018

    it’s so weird how summarized the 10.2 network the most accurate way to do it is
    ip summary-add eigrp 100 10.2.0.0 255.255.240.0 its gonna be /20 both works but this is the correct way of not killing some bits

  24. Maracus
    March 23rd, 2018

    501Qs
    “please get the new real questions for CCNP route 300-101”
    At below link:
    Real valid questions, we 3 friends passed it.

    Click Below Link:

    501Qs
    “please get the new real questions for CCNP route 300-101”
    At below link:
    Real valid questions, we 3 friends passed it.

    Copy Below Link:

    docs.google.com/document/d/1oVSLbsZ0nuxaw5tZJjKYjRPR_m0k9jsa23ZqrECLIb8/edit

  25. chuks
    March 26th, 2018

    @wax I am as surprised as you that Cisco exams accepted 10.2.0.0/16 as correct summary. This beats the foundational knowledge gotten from CCNA

  26. NAS85
    March 29th, 2018

    Hi i would be very grateful if someone could give me a quick explanation as to why its 10.2.0.0 255.255.0.0 ? i was under the assumption it would be 10.2.0.0 0.0.255.255

  27. bluephoenix
    April 3rd, 2018

    @NAS85
    https://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1.html
    CTRL F and type summary-address

    look at the options, it says mask and not wildcard mask, so 255.255.0.0 is the correct one.

  28. Anon
    April 4th, 2018

    @bluephoenix @NAS85,

    Ack, just passed the exam. 255.255.0.0 does the trick, while anything like 255.255.240.0 (or a bit wider) does not sum the routes.

  29. Farhan
    April 9th, 2018

    Guys wana do my route next help me with the latest dumps

  30. mkhlefah
    April 10th, 2018

    Hello to all !

    Please, can you send me the ccnp route last dumps ?

    My address email is {email not allowed}

    Thank you for your support !!!

  31. NAS85
    April 10th, 2018

    Thank you bluephoenix, appreciate your help.
    congrats on passing Anon, im hoping to take my exam before the end of this month, hopefully there isnt any new release of material before then. Im just going through the sim questions now, trying to understand each and every answer.

  32. cisco breaker
    April 11th, 2018

    Hey friends, who took the exam recently? the labs are still:
    PBR
    Redistribution
    OSPF
    EIGRP
    OSPFv3

    ??

    Appreciate the help.

  33. Alex
    April 20th, 2018

    @cisco breaker they’re the same since before 300-101 v1 so yeah

  34. Marcus
    April 23rd, 2018

    I tried this SIM in UNL and in CPT and got a different results. In UNL “auto-summary”/”no auto-summary” is influence to route table, in CPT not. Also in UNL I have TWO directly connected local routes (/24 and /32) anyway, so no way to get ONLY TWO routes with EIGRP. I think this is an incorrect SIM or it SIM was made just for limitations of the exam test environment. What do you think?

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