Home > Ticket 11 – Redistribution Route-map (a & b)

Ticket 11 – Redistribution Route-map (a & b)

April 26th, 2018 in TSHOOT v2 Go to comments

On R4:
router eigrp 10
  redistribute ospf 1 route-map OSPF->EIGRP
  network 10.1.4.0 0.0.0.255
  network 10.1.10.0 0.0.0.255
  network 10.1.21.128 0.0.0.3
 default-metric 100000 100 100 1 1500
  no auto-summary
!
……
route-map OSPF_to_EIGRP deny 10
 match tag 90
route-map OSPF_to_EIGRP permit 20
  set tag 110

Ans1) R4
Ans2) IPv4 Route Redistribution
Ans3) Under the EIGRP process, delete the ‘redistribute ospf 1 route-map OSPF->EIGRP’ command and enter ‘redistribute ospf 1 route-map OSPF_to_EIGRP’ command.

Explanation for this ticket:

In this topology, we are doing mutual redistribution at multiple points (between OSPF and EIGRP on R4, DSW1 & DSW2), which is a very common cause of network problems, especially routing loops so you should use route-map to prevent redistributed routes from redistributing again into the original domain.

In this ticket, route-map is also used for this purpose. For example, the route-map “EIGRP->OSPF” is used to prevent any routes that have been redistributed into OSPF from redistributed again into EIGRP domain by tagging these routes with tag 90. These routes are prevented from redistributed again by route-map OSPF->EIGRP by denying any routes with tag 90 set.

Comments (15) Comments
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  1. Anonymous
    August 9th, 2019

    Sí, siguen poniendo preguntas, son pocas con respecto al route y switch.

  2. mike
    September 21st, 2019

    Hello, I failed tshoot today.
    I can’t understand where R4 error.

    Ping to R4(10.1.4.9) is passed.
    But Pint to R4(10.1.1.10) is not passed.
    So I thught R4 must be error.

    I examined R4’s configure…but I could not error.

    I now think that R4’s error is route-map ralated to this ticket…

  3. Harold Lloyd
    September 21st, 2019

    Its a cunning answer, I tell thee… (11a)

    route-map OSPF->EIGRP doesn’t exist within the config!!

    Yet its sat there under EIGRP 10..

    But by amending it with OSPF_to_EIGRP route map, makes everything fall into place, as we have to take on board that EIGPR->OSPF is correct as it is;

    * Denying Tag 110 (OSPF metric clue, though it can be any number)

    * Set Tag 90 (EIGRP metric clue, though it can be any number)

    Whilst using OSPF_to_EIGRP is preventing looping with;

    * Denying Tag 90 (EIGRP metric clue, though it can be any number)

    * Set 110 (OSPF metric clue, though it can be any number)

  4. DOTTMAN
    September 23rd, 2019

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  5. Jessica
    October 6th, 2019

    @mike In order to know if the route-map or redistribution is the problem, you can input show ip route into R4 and then in DSW1 and then compare. If the OSPF routes are not present in DSW1 or some routes are missing, it is usually due to a route-redistribution issue

  6. Anonymous
    October 13th, 2019

    On R4:
    router eigrp 10
    redistribute ospf 1 route-map OSPF->EIGRP
    network 10.1.4.0 0.0.0.255
    network 10.1.10.0 0.0.0.255
    network 10.1.21.128 0.0.0.3
    default-metric 100000 100 100 1 1500
    no auto-summary
    !
    route-map OSPF->EIGRP deny 10
    match tag 90
    route-map OSPF->EIGRP deny 20
    set tag 110
    Ans1) R4
    Ans2) IPv4 Route Redistribution
    Ans3) There is no choice to delete OSPF-> EIGRP deny 20 or change it to permit

    why?

  7. japman
    October 13th, 2019

    On R4:
    router eigrp 10
    redistribute ospf 1 route-map OSPF->EIGRP
    network 10.1.4.0 0.0.0.255
    network 10.1.10.0 0.0.0.255
    network 10.1.21.128 0.0.0.3
    default-metric 100000 100 100 1 1500
    no auto-summary
    !
    route-map OSPF->EIGRP deny 10
    match tag 90
    route-map OSPF->EIGRP deny 20
    set tag 110
    Ans1) R4
    Ans2) IPv4 Route Redistribution
    Ans3) There is no choice to delete OSPF-> EIGRP deny 20 or change it to permit

    why?

  8. matty
    October 14th, 2019

    what is the topology for this ticket?

  9. Shaunthesheep
    October 14th, 2019

    Matty, you can use IPv4 Layer 3 topology for this one. Otherwise you can just look at route map clauses to check what will be redistributed

  10. dk2019
    October 19th, 2019

    With packet tracer you can not use default metrics however you can use redistribution metric under EIGRP. I have tested below worked well.

    router eigrp 10
    redistribute ospf 1 metric 100000 100 255 100 1500
    network 10.1.4.4 0.0.0.3
    network 10.1.4.8 0.0.0.3
    network 10.1.21.128 0.0.0.31
    no auto-summary

  11. Anon Pass
    October 31st, 2019

    Today I received this ticket. as japman says the problem was that the RM was deny on both statements. I had an option for ‘ipv4 redistribution’ > ‘remove sequence 20, add seq 20 permit and set tag’

  12. pen
    November 7th, 2019

    Please tell me about ticket 11 (b).

    When I took the exam on November 5, the configuration was as follows.

    router eigrp 10
       redistribute ospf 1 route-map OSPF-> EIGRP
       network 10.1.4.0 0.0.0.255
       network 10.1.10.0 0.0.0.255
       network 10.1.21.128 0.0.0.3
      default-metric 100000 100 100 1 1500
       no auto-summary
    !

    However, it remembers that “OSPF_to_EIGRP” is not set in the config.

    If “OSPF_to_EIGRP” is not in the config, should I select “remove sequence 20, add seq 20 permit and set tag”?

    With this option, when redistributing from OSPF to EIGRP

    Route-map OSPF-> EIGRP deny 20
    set tag 110 ”

    The setting

    Route-map OSPF-> EIGRP permit 20
    set tag 110 ”

    If it is changed to the setting, it will be redelivered, so I think that it is the correct answer, but is it correct?

  13. Dan2525
    November 10th, 2019

    Didn’t pass :(

    i got three tickets where interface in R1(Se0/0/0) did not have the “authentication” entry:
    #ip ospf authentication message-digest and notice that R2 interface(Se0/0/0.12) did:
    Just like this:
    ip ospf authentication message-digest
    ip ospf message-digest-key 1 md5 TSHOOT – “this is what i understand is Ticket-1 only”
    idk maybe i was tired.

    On the other hand, inthe BGP mini-lab:

    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

    Do you actually need to save this config??
    Cause neither the “#copy run start” nor “#wr” worked for me in enable mode.

    i appreciate your thoughts.

  14. CCNE2B
    November 12th, 2019

    In Packet Tracer (7.1.x) there is no support for using route-maps in redistribution.
    GNS3 does support this. When set-up like “japman” stated above, this part:

    route-map OSPF->EIGRP permit 20
    set tag 110

    will result in OSPF routes being redistributed into EIGRP (by R4) and tagged with 110.
    The tag (110) will show on DSW1 via command: show ip eigrp 10 topology

    When route-map entries 10 and 20 are both set to “deny”, no OSPF routes are redistributed.

  15. @dan2525
    November 18th, 2019

    Same didn’t pass. I swear I had like 3 of the same type of ticket too. Was so stressful.

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