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BGP Sim

February 4th, 2019 in Simlets Go to comments

Question

Loopback0 is used for IBGP peering while physical interface address is used for EBGP. Identify the IBGP issues on R1 to R2, R3 and EBGP issues to RA and fix them so that the “show ip bgp” command on R1 will display all loopback interfaces of other routers.

BGP_Topology.jpg

Special thanks to Madruga who created this BGP simlet with EVE-NG emulator and you can download it here.

Configs on R1:

This lab is for BGP only so we only need to check BGP section

R1#show running-config
—-output omitted—-
router bgp 64520
network 172.16.1.1 mask 255.255.255.255
neighbor IBGP peer-group
neighbor IBGP remote-as 64550
neighbor IBGP update-source loopback0
neighbor 172.16.2.2 peer-group IBGP
neighbor 172.16.3.3 peer-group IBGP
neighbor 209.165.200.2 remote-as 64525

—-output omitted—-

Solution

We see there are two issues here (two commands in bold), the first one is IBGP issue and the second one is EBGP issue.

R1(config)#router bgp 64520
R1(config-router)#neighbor IBGP remote-as 64520
R1(config-router)#no neighbor 209.165.200.2 remote-as 64525
R1(config-router)#neighbor 209.165.201.2 remote-as 64525

Note:
+ In the second statement we fix the IBGP group to “remote-as 64520” without removing the wrongly configured IBGP group (“neighbor IBGP remote-as 64550”) because if we remove this statement, other related statements of IBGP (three statements “neighbor IBGP update-source Loopback0”, “neighbor 172.16.2.2 peer-group IBGP”, “neighbor 172.16.3.3 peer-group IBGP”) will be removed automatically because IBGP group no longer exists.
+ Also in statement 2 the “IBGP” group must be written in capital. You will receive an error if writing it in lowercase.
+ The IP addresses in the exam are different but the concept is still the same so please read the question carefully

After solving the problem don’t forget to verify with the “show ip bgp” command. You must see all the Loopback interfaces of other routers. Otherwise please check your commands again.

Comments (23) Comments
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  1. TO
    December 2nd, 2019

    @Help? In the question it shows you what your BGP table should look like. Run the command and if it matches, you’re correct.

  2. frank
    December 3rd, 2019

    “How do you know to change it to 209.165.201.2”

    @networktut

    Same question here how do we know which IP to change it to??

  3. Someone
    December 3rd, 2019

    @Frank and @TO

    “How do you know to change it to 209.165.201.2”

    Look at the topology chart dude!

  4. Colonel
    December 3rd, 2019

    Hi all.
    I download BGP simlet but there’s no configurations.

  5. Cisco Tshoot
    December 4th, 2019

    I have failed Tshoot exam. I scored 793 . The multiple questions were hard for me. I had to troubleshooting .

    Weird questions,

    I was not able to ping from ASW1 to webserver. I expected to be the problem to be

    1. trunk between ASW1 and DSW1
    2 vlan access on ASW1
    3. port security on ASW1
    4. Vlan access mode

    I checked all of them . They were configured correctly. So I was lost in the exam

    you have to know how to configure tunnel . I lost two questions on them as well

    Cheers

  6. Jhon
    December 4th, 2019

    @Cisco Tshoot were the mcq the same?

  7. Uhmm What?
    December 12th, 2019

    @ Cisco Tshoot, Need to look at R1 NAT and look for Missing IP statement for 10.2.0.0 network or the Enable OSPF “auth message-digest” CMD on R1 that is located in R2, look into NULLZERO strategy as a tool.

  8. Anonymous
    December 14th, 2019

    OK Failed today 764… MCQ’s were the same with one new question regarding uRfp or something like that. HSRP is on point but the Router AS number was different…I Think. anyway trying again next week!

  9. networkpsych
    December 16th, 2019

    hi all where do i get the MCQs here on my 9tut i dont see any questions on MCQs please share a link

  10. Noor
    December 21st, 2019

    Failed on dated 19 Dec marks 804

    stuck in one ticket no ping from ASW-1 while ping ok from DSW-1

    unable to identify

  11. Anonymous
    December 21st, 2019

    @ Cisco Tshoot
    its same in my case it means there possibly bug

    should open case with cisco

    I have failed Tshoot exam. I scored 804 The multiple questions were hard for me. I had to troubleshooting .

    Weird questions,

    I was not able to ping from ASW1 to webserver. I expected to be the problem to be

    1. trunk between ASW1 and DSW1
    2 vlan access on ASW1
    3. port security on ASW1
    4. Vlan access mode

    I checked all of them . They were configured correctly. So I was lost in the exam

  12. Curious
    December 22nd, 2019

    Hi guys, i am taking exam in 2 days..any advice?

  13. ItsShowtime
    December 27th, 2019

    Hi guys,
    Just like @DD I had the following line in the config:
    “network 172.16.0.0 mask 255.255.255.255” instead of “network 172.16.1.1 mask 255.255.255.255” which is the correct configuration and the one mentioned on this page.
    Just like DD, I tried to replace the line without success. I am thinking I might have broken the config by trying to replace that incorrect line causing me to fail the exam. I don’t know if there is a way to know or proof that my failure might have been caused by a mistake in the exam… As Cisco Internals even we are clueless about the procedures regarding Cisco Certifications…

  14. Pusheen
    January 6th, 2020

    hi guys hope you can help me.. when i tried to execute the command on the router it never change. router is not accepting the commands. this is for the BGP simlet. TIA

  15. @Pusheen
    January 9th, 2020

    Are you talking about the simlet on NetworkTut? You can’t enter any config commands here.

  16. morarica
    January 12th, 2020

    can anyone use the simlet from madriga? i cannot start the routers.

  17. Saji
    January 14th, 2020

    @ ItsShowtime,,,,

    How many lab sim that we should change the config on real exam??
    or Aren’t we suppose the change the config at all as networktut webside says.?

  18. Daveado
    January 15th, 2020

    I’ve tried this and the HSRP simlet in EVE-NG and for both or them none of the devices have any config. The topology is there and all the interfaces are connected, but there’s only default config on all devices?

    Anyone else had this issue and been able to fix?

  19. Bryan
    January 16th, 2020

    Hi, Passed Tshoot exam last monday(1/13/2020) and Finally completed 3 exams(Routing,Switching and Tshoot). All question and tickets from this site are valid. If you want dumps and materials I can share them with you just shoot email bryandiazbd430 @ gmail .com :)

  20. Stan
    January 17th, 2020

    Where can I get simplets initial configs ?

  21. Jenny_chey
    January 21st, 2020

    Does anyone have a working lab on this?

    Thanks,
    Jen

  22. Anonymous
    January 25th, 2020

    R1(config)#router bgp 64520
    R1(config-router)#neighbor IBGP remote-as 64520
    R1(config-router)#no neighbor 209.165.200.2 remote-as 64525
    R1(config-router)#neighbor 209.165.201.2 remote-as 64525

    Wr and copy ru start Works on this sim ???? to save the config….

  23. Stan
    January 26th, 2020

    Just passed 923, messed up an IP ticket I think… everything is valid still, probably will be till 23rd… Anyone need material hit me up at yoz[@]gmx.us

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