Home > Lab Sim > MPLS TDP Neighbor Lab Sim

MPLS TDP Neighbor Lab Sim


R1 and R2 are not able to establish MPLS TDP neighbor relationship between them. Use various show commands to troubleshoot the problem then use the proper configuration command(s) to solve the MPLS TDP issue. Once R1 and R2 can see each other as MPLS TDP neighbor, then you have successfully completed the simulation.

Privileged mode password: mpls



Answer and Explanation

Before reading the answer and explanation, you can try solving this question yourself by download the initial configuration and running it with GNS 3 here:

Download MPLS Lab Sim Initial Configuration GNS3 file

(Notice that the only difference of this file and the real exam is it doesn’t have privileged mode password and the interfaces between 2 routers are S1/0, not S0/0 and S0/1. The IOS used is c3660-jk9o3s-mz.124-17.bin. Also, you must change the image and config paths of the net file to make it work well )

Use the “show mpls ldp neighbor” or “show tag-switching tdp neighbor” command on both routers to see their neighbor relationship.

R1 (and R2)# show mpls ldp neighbor

We notice that the outputs show nothing, meaning that the TDP neighbor between two routers has not been established.

(Note: We can use the “show mpls ldp neighbor” to view the TDP neighbors because this command displays the state of both TDP and LDP neighbors. If not, you can use the “show tag-switching tdp neighbor” command instead)

Now use the show running-config command on both routers and notice in the RIP section

R1 (and R2)#show running-config


The problem here is when a loopback interface is configured on the router, it will automatically become the TDP-id of that router (same as the router-id) but we didn’t declare this network in the RIP configuration -> MPLS TDP neighbor failed.

You can also check to see which interface is used as the TDP-id by the “show mpls ldp discovery” (notice the command is ldp, not tdp)

R1# show mpls ldp discovery


To fix this, we have to declare the router’s loopback network in the RIP configuration

R1#configure terminal
R1(config)#router rip

R2#configure terminal
R2(config)#router rip

Now if we use the “show mpls ldp neighbor” again we can see the neighbor relationship has been established.

R1# show mpls ldp neighbor


Categories: Lab Sim Tags:
  1. boom_zoom
    April 16th, 2011 at 01:46 | #1

    took the exam yesterday and this was valid.
    you can use either
    show tag-switching tdp ______
    show mpls ldp _______
    both are working in the lab with the same exact output.

    and of course, always always always do copy run start. its very impt.

  2. myself
    May 20th, 2011 at 19:47 | #2


    There is a download link (Download MPLS Lab Sim Initial Configuration GNS3 file) that doesn’t work. How can we download this GNS3 file?

  3. iptut
    May 21st, 2011 at 05:05 | #3

    @myself: I updated the link and you can download it now. Thanks for your detection!

  4. myself
    May 23rd, 2011 at 10:38 | #4


    Thanks man. Thanks to you and Dodo I’ve passed 642-691 today with flying colors.

  5. follower of iptut- a great website for learning
    May 24th, 2011 at 10:36 | #5

    Thanks iptut for the explanation..its helps a lot to understand the concepts and clearing the exams too.

    You have been too helpful..

    Thanks again

  6. myself
    May 24th, 2011 at 14:41 | #6

    Now how about QoS labsim section?

  7. Kibria
    August 7th, 2011 at 06:17 | #7

    Can anyone emial (kibriay@yahooo.com) me the initial configuration of these MPLS+BGP labs.

  8. CCIP
    August 22nd, 2011 at 07:37 | #8

    973/1000. passed today. Thanks IPTUT. All questions from DODO.

  9. Only need MPLS
    September 1st, 2011 at 19:13 | #9

    Hi CCIP (August 22nd, 2011)

    DODO is for BGP+MPLS, right?

    I am looking for a only MPLS exam…


  10. CCIP
    September 5th, 2011 at 06:55 | #10

    yes, DODO is for combo. For only MPLS u need to search for p4s.

  11. Only need MPLS
    September 5th, 2011 at 21:07 | #11

    Thanks CCIP, I am testing with P4S 2.29 and iptut labs.
    I have exam this thursday.


  12. Kshitij
    September 6th, 2011 at 10:23 | #12

    I have passed today 1000/1000
    Thanks iptut!!!

  13. kristchen
    September 7th, 2011 at 04:40 | #13

    i am ccna please suggest me what is best ccnp or ccip for india, what should i do

  14. Mai
    September 8th, 2011 at 09:04 | #14

    Personally, I think CCIP is a little bit harder than CCNP; however, it depends on in which area you’re working now. If you are working in ISP or NSP, so CCIP suits you more. But if not, I think, take CCNP first, CCIP later.

    Hope this help.

  15. umer
    September 14th, 2011 at 08:28 | #15

    hey guys….
    m plannin tu rite my 602-813 n 642-832 exm dis week, so plz plz hlp me out by postin new n updated dump 2 my mail addres…. sadath.khan002@gmail.com…… plzzzzzz guys…

  16. Lostprophet
    October 23rd, 2011 at 13:55 | #16

    Is there a link for the QOS SIM too? Thanks in advance!!

  17. Inshallah
    October 29th, 2011 at 03:29 | #17

    Why not use:

    mpls ldp router-id serial 0/1 force
    mpls ldp router-id serial 0/1 force


  18. Sriram
    December 13th, 2011 at 05:50 | #18

    HI All,

    this simulation is correct. I cleared CCIP.

  19. CCIP
    December 18th, 2011 at 18:55 | #19

    How to get the full DODO…….can i rely on iptut and go for my exam….kindly help i am new user.

  20. testtaker
    January 28th, 2012 at 09:45 | #20

    better to save the config in the last part to prevent loss of marks:
    “copy run start” or “wr mem”

    if there is error means there is no need to use the above commands. 🙂

  21. Didier
    February 5th, 2012 at 09:46 | #21

    I downloaded the configs, but cant seem to run it on my gns keeps giving an error ‘local ios image xxxxxxxxx cannot be found on hypervisor localhost:7200’
    Please choose an altenative image with the option being the ‘c3660-jk9o3s-mz.124-17.bin’ i downloaded. when i click it, it give 203-bad number of parameters(1 with min/max=2/2)
    Am i doing anything wrong?

  22. zatash
    February 29th, 2012 at 14:06 | #22

    hi all
    pls, where can i get MPLS + BGP nugget to download. or u can send it to my inbox (kofikoma@hotmail.com). thanks

  23. leo
    March 11th, 2012 at 10:44 | #23

    download it from http://www.careercert.info

  24. mangkiko
    April 5th, 2012 at 03:43 | #24

    anyone took the exam lately? i heard some additional on labs?? appreciate if anyone can confirmed this…thanks

  25. Anand
    April 22nd, 2012 at 16:41 | #25

    Hi, i am planning to MPLS exam which material i need to prepare the for the exam. Anyone can help me. Also share your experience on the simulations

  26. Zeropro
    April 24th, 2012 at 00:10 | #26

    can somebody send me the pdf ver of mpls+BGP please. ghayoor@gmail.com

  27. ralph
    April 25th, 2012 at 18:06 | #27

    hi, im about to take the exam. does anyone have the new dumps for BGP+MPLS? could anyone email me a copy? loren.ralph@yahoo.com

  28. Jorge Allen Adajar
    May 7th, 2012 at 06:20 | #28

    Hi Guyz,

    Good afternoon 🙂

    i just want to know how many Labs in the exam? is it only 2?

    Thank You

  29. CiscoOoOo
    May 21st, 2012 at 10:19 | #29

    Hi Guyz,

    I’m planning to take the BGP+MPLS exam within this month. is the 99q dump is still valid ? is there any other labs more than these 2 labs ??


  30. Slash
    May 29th, 2012 at 14:38 | #30

    i just passed the BGP + MPLS comp. exam today with a score of 1000/1000, the 99q dump is 100% valid, so are both labs.
    best of luck guys, and hurry as this exam will retire in July

  31. muneer
    May 31st, 2012 at 08:22 | #31

    Hi slash….
    is both DODO nd 99q dumps are same and valid ??
    and what about labs.

  32. ipmonster
    June 13th, 2012 at 18:41 | #32

    I have scheduled my composite exam next month, july 11..
    im really impressed with this site and i would appreciate if any1 could direct me to someother useful sites for dumps etc..

  33. MrCisco
    June 19th, 2012 at 02:27 | #33

    In spanish, because I’m Argentinian.
    Gente, el 21/06/2012 tomare el examen MPLS. Segun me comentaron, el P4S es el que actualmente está actualizado.
    Les escribiré luego del examen.

  34. ntwrk
    June 29th, 2012 at 12:44 | #34

    passed MPLS today 987/1000. p4s v2.29 is valid, but prepare for MPLS TE. I’ve got nearly 10 TE questions.

  35. Max
    July 3rd, 2012 at 05:44 | #35

    Hi guys!

    Can you please explain, why should we add this network to RIP?

    I wrote ‘redistribute connected’ in the RIP instead and in the lab it also worked. So is it a valid idea, or we should only add network command only?

  36. Ahmed
    July 13th, 2012 at 15:52 | #36

    @ iptut
    from where can i download c3660-jk9o3s-mz.124-17.bin as its not found in the download link and i tried to download it from internet but unfortnatlly couldn’t, my mail is leader_07@yahoo.com , thanks in advance

  37. Ahmed
    July 13th, 2012 at 15:53 | #37

    also if available i need the lab of BGP in GNS-3

  38. Viki
    July 14th, 2012 at 08:18 | #38
  39. Ahmed
    July 15th, 2012 at 17:30 | #39

    @ viki, thank you, i already downloaded the image and registered it to the router but unfortunately lab still not working, its seems a problem in the dynamips server but i couldn’t solve it.

  40. Ahmed
    July 17th, 2012 at 21:09 | #40

    @ iptut, thanks very much i have passed the exam today and got 1000 , many thanks

  41. SAHIL
    July 20th, 2012 at 05:12 | #41

    Hi, Guys can anyone tell me if these are the only 2 labs / sims coming in the exam or are there any more , anyone has seen ???
    Also are there any MPLS TE questions ??

  42. SAHIL
    July 20th, 2012 at 05:16 | #42

    @Ahmed…. where there only 2 labs as in iptut or any other also??

  43. NAT
    July 21st, 2012 at 10:32 | #43

    Hi boys ,
    Thanks Iptut ,i have passed the exam yesterday ,they are 2 lab only ,olso dodo 80 is still valid

  44. Zafer
    August 30th, 2012 at 00:18 | #44

    Kudos Careercert, u’ve been a deal of help for my exams. Pls, i tink u should utadpe most of the exams here like mpls+bgp, Qos though its same number of questions but they’ve been utadped it in December. tanks

  45. Gursharn
    October 21st, 2012 at 14:24 | #45

    Can anybody tell me that where the latest dump and labs can be found for current BGP+MPLS (Cisco 642-691) exam???

  46. Kevin_k
    May 1st, 2013 at 08:15 | #46

    Hi All

    Is there any standalone MPLS exam still available?

    I looked at 642-611 and Cisco has stopped this exam since July 2012.

    I would like to get certification in MPLS, is there any other test available??

    Many Thanks

  47. Anonymous
    June 21st, 2013 at 17:30 | #47
  48. mayank
    November 27th, 2013 at 11:21 | #48

    Friends need the 3660 images for gns3 help please

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    December 30th, 2013 at 07:02 | #49

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    Great help!, explanations are sooo sweet@HSRP, VRRP, GLBP http://cisconetworkingcenter.blogspot.com/2013/01/first-hop-redundancy-protocol.html

    November 1st, 2014 at 07:05 | #50

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  51. mamun
    January 28th, 2015 at 07:56 | #51

    very nice

  52. AZ
    February 4th, 2015 at 12:33 | #52

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  53. dumpspro dot com
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