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EIGRP OSPF Redistribution Sim

January 8th, 2015 in Lab Sim, LabSim Go to comments

Question

OSPF_EIGRP_Redistribution.jpg

Answer and Explanation:

First we need to find out 5 parameters (Bandwidth, Delay, Reliability, Load, MTU) of the s0/0/0 interface (the interface of R2 connected to R4) for redistribution :

R2#show interface s0/0/0

Write down these 5 parameters, notice that we have to divide the Delay by 10 because the metric unit is in tens of microsecond. For example, we get Bandwidth=1544 Kbit, Delay=20000 us, Reliability=255, Load=1, MTU=1500 bytes then we would redistribute as follows:

R2#config terminal
R2(config)# router ospf 1
R2(config-router)#
redistribute eigrp 100 metric-type 1 subnets
R2(config-router)#exit
R2(config-router)#router eigrp 100
R2(config-router)#redistribute ospf 1 metric 1544 2000 255 1 1500

(Notice: In fact, these parameters are just used for reference and we can use other parameters with no problem. Also, a candidate said that the simulator didn’t accept the Bandwidth of 1544; in that case, we can use a lower value, like 128.

If the delay is 20000us then we need to divide it by 10, that is 20000 / 10 = 2000)

Note: “usec” here does not mean microsecond (which is 1/1000 milliseconds) but means millisecond. In short usec = msec. I don’t know why they use the word “usec” here but just think it is “msec” (According to this link: http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml#eigrpmetrics: “The delay as shown in the show ip eigrp topology or show interface commands is in microseconds”)

For R3 we use the show interface fa0/0 to get 5 parameters too

R3#show interface fa0/0

For example we get Bandwidth=100000 Kbit, Delay=1000 us, Reliability=255, Load=1, MTU=1500 bytes

R3#config terminal
R3(config)#
router ospf 1
R3(config-router)#
redistribute eigrp 100 metric-type 1 subnets
R3(config)#
exit
R3(config-router)#
router eigrp 100
R3(config-router)#
redistribute ospf 1 metric 100000 100 255 1 1500

Finally you should try to “show ip route” to see the 172.16.100.1 network (the network behind R4) in the routing table of R1 and make a ping from R1 to this network.

Note: If the link between R2 and R3 is FastEthernet link, we must put the command below under EIGRP process to make traffic from R1 to go through R3 (R1 -> R2 -> R3 -> R4), which is better than R1 -> R2 -> R4.

R2(config-router)# distance eigrp 90 105

This command sets the Administrative Distance of all EIGRP internal routes to 90 and all EIGRP external routes to 105, which is smaller than the Administrative Distance of OSPF (110) -> the link between R2 & R3 will be preferred to the serial link between R2 & R4.

A reader on our site has a closer explanation for the “distance eigrp 90 105” command so we quote it here for your reference:

The “distance” refers to the administrative distance of the routes provided by a given routing process. By default, internal (which means non-redistributed) EIGRP routes are given an administrative distance of 90 while external (redistributed from another routing process) EIGRP routes are given an administrative distance of 170. The default administrative distance of OSPF is 110. The administrative distance measures the “distance from the truth” and tells the router which routes are more trustworthy. Lower administrative distance = more trustworthy. For this reason, connected routes have an administrative distance of 0. They are the MOST TRUSTWORTHY, because they are physically connected to the router. When making a decision about which route to install in the routing table, the router looks at administrative distance first. The metric (or cost) is only considered if two routes have the same administrative distance.

In this case, R2 will learn about R4’s loopback network from both R4 and R3. The route from R4 will be in OSPF (admin distance of 110) because R2 is also running OSPF while the route from R3 will be an external EIGRP route (administrative distance of 170 by default). Since the OSPF route has a lower administrative distance, it will get placed in R2’s routing table and the R3-provided route will be ignored. This is not optimal, since the path through R3 is a faster, more reliable path. To fix this, we change the administrative distance of external EIGRP routes at R2 by using the “distance eigrp 90 105” command. This sets the administrative distance of internal EIGRP routes to the default of 90 and changes the administrative distance of external EIGRP routes to 105 (less than that of OSPF routes). Now, when R2 learns of the loopback network from R4 and R3, it will install the now lower administrative distance external EIGRP route from R3 and our traffic from R1 will take the faster path.

Note: Please check the OSPF process numbers first before typing these commands.

If you want to have a closer look at this sim and understand more about the “distance eigrp” command, please read my OSPF EIGRP Redistribute Lab in GNS3.

Other lab-sims on this site:

EIGRP Stub Sim

OSPF Sim

IPv6 OSPF Virtual Link Sim

EIGRP Simlet

Policy Based Routing Sim

Comments
Comment pages
1 3 4 5 26
  1. coach
    November 20th, 2018

    Hi guys any latest dumps for 300-101.

    my exam is in the end of the month

    this is my email id : omermuktaryan at gmail dot com

    thank you

  2. little reader
    November 22nd, 2018

    Hi guys.

  3. Team_Stark
    December 9th, 2018

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  4. Anonymous
    December 19th, 2018

    @team_shark
    you didnt reply about your paper

  5. Adudz
    January 3rd, 2019

    Can you please share question for this Lab – EIGRP OSPF Redistribution Sim

  6. Bold
    January 11th, 2019

    hey guys, failed my exam today. do you know why “distance eigrp 90 105” command didn’t work for me?

  7. Steve
    January 11th, 2019

    Hi Bold,
    what syntax did you use?
    Which LABs did appear in the exam?

  8. michael blackson
    January 12th, 2019

    Hi guys
    Can someone advise if the SPOTO Q227 & 300-101 V23.75 still valid enough ?

    I have the exams soon. or share the dumps anyone? I have the GNS3 Labs with IOS to
    run will share soon.

    Anyone who recently wrote please advise.

  9. Bold
    January 18th, 2019

    Hi Steve,
    #R2
    conf t
    router eigrp 100
    distance eigrp 90 105
    end

    I validated with trace and show ip route

    also, for some reason, “copy run start” didn’t work for me and I didn’t save any configs.

    I did have 3 sims OSPF Evaluation, EIGRP OSPF redistr, EIGRP Stub.

  10. amrdul
    January 19th, 2019

    Can someone please post the questions for this lab. thanks.

  11. TACACS+
    January 20th, 2019

    Hi guys! one of the requirement said:
    you must be able to ping and telnet. My question is do we have to configure LINE VTY TO ALLOW TELNET? OR JUST PING WILL BE ENOUGH
    The reason why i would like to know is because it will require a password as we all know. |I have my exam next week

  12. SW
    January 22nd, 2019

    Hi Guys, Hope you are fine… Can you please assist me in order to get CCNP ROUTE dumps.

    smkwarsi(at)hotmail(dot)com

    Thanks in advance for the attention & consideration.

  13. BLAZE
    January 29th, 2019

    Please someone should respond to @Bold question

  14. Anonymous
    January 29th, 2019

    what is the correct way of saving your configs in the exam

  15. Anonymous
    January 29th, 2019

    @TACACS+ have you written your exams? how was it?

  16. TACACS+
    January 29th, 2019

    yes I had

  17. TACACS+ 9xx
    January 29th, 2019

    and I passed

  18. Anonymous
    January 29th, 2019

    I had OSPF VIRTUAL LINK and EIGRP STUB but I couldn’t save any of them. I have tried:

    R2#copy running-config startup-config
    R2#write memory
    none of them works so i have just skipped

  19. TACACS+
    January 29th, 2019

    I had OSPF VIRTUAL LINK and EIGRP STUB but I couldn’t save any of them. I have tried:

    R2#copy running-config startup-config
    R2#write memory
    none of them works so i have just skipped

  20. Adudz
    February 8th, 2019

    TACACS+ can you share how many labs in your exam then is it same lab like here in digitaltut.?

  21. gent
    February 18th, 2019

    when i open these sims they arent loading the config of the devices. what am i missing?

  22. gent
    February 20th, 2019

    since r3 is redistributing ospf networks into eigrp with a higher bandwidth should it be preferred without the distance command?

  23. gent
    February 26th, 2019

    nermind i know why im an idiot

  24. Will this work in exam?
    March 1st, 2019

    R2:

    config t
    router eigrp 100
    redistribute ospf 2 metric 1000 1 1 1 1

    router ospf 2
    redistribute eigrp 100 metric 1000 subnets metric-type 1

    router eigrp 100
    distance eigrp 90 105

    R3:

    config t
    router ospf 3
    redistribute eigrp 100 metric 500 subnets metric-type 1

    router eigrp 100
    redistribute ospf 3 metric 5000 1 1 1 1

  25. Net09
    March 27th, 2019

    Pls I need the latest dump for ccnp 300- 101. Pls send it to my mail kazbest @ Mail . ru

  26. PASSED!!
    March 29th, 2019

    Got a 839/790. 55 questions. 4th time is the charm

    If you get the redistribution lab, here is the easier commands then what this site tells you.

    R2:

    Router eigrp 100 (Verify Number by “Sh Run”)
    distance eigrp 90 105
    redistribute ospf 1 (verify number by “Sh Run”) metric 500 1 1 1 1

    Router ospf 1 (Verify Number by “Sh Run”)
    redistribute eigrp 100 metric 500 metric-type 1 subnets

    R3:

    Router eigrp 100 (Verify number by “Sh Run”)
    redistribute ospf 1 (Verify number by ‘sh run”) metric 1000 1 1 1 1

    Router ospf 1 (Verify Number by “sh run”)
    redistribute eigrp 100 metric 100 metric-type 1 subnets

    Those commands worked for me. Much easier to remember for sure.

  27. Aquadig
    March 31st, 2019

    Router ospf 1 (Verify Number by “sh run”)
    redistribute eigrp 100 metric 1000 metric-type 1 subnets

    right? you put metric 100 and i think is 1000

  28. Alcap
    March 31st, 2019

    Does anyone have the configs for these labs? I’m looking to work them over before the exam.

  29. Philips
    April 1st, 2019

    Pass today, 925
    Chinese dump valid
    Labs PBR, EIGRP OSPF redistribute, IPv6
    Thanks digitaltut and all!
    email: philipsmeloo@ gmail .com

  30. Pira
    May 17th, 2019

    Hi Phillip, can you help with how you did the eigrp redistribution? When you do show int f0/0 on R3, you get bandwith as 100000, delay 100, reliability 255, load 1 and mtu 1500. Did you divide the delay by 10? Did you do it as,
    router eigrp 100
    redistribute ospf 1 metric 100000 10 255 1 1500 or

    redistribute eigrp 100
    redistribute ospf 1 metric 10000 100 255 1 1500?

    I have failed four times already with a short of less than 15 marks in all attempts. I know this is the reason why I have failed in all attempts. Please help!!!

  31. Philips
    May 18th, 2019

    @Pira: I did exactly the same as instructions in this site. Please read them carefully and follow. About delay, you have to divide by 10 because it is in 10us (in command). Good luck

  32. Pira
    May 18th, 2019

    Thanks Pira

  33. Buddy
    May 19th, 2019

    @Pira
    Take a look to the following Cisco documentation:

    delay -> Route delay, in tens of microseconds -> Scaled Delay = (Delay/10)

    https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-sy/ire-15-sy-book/ire-wid-met.html

  34. Pineapple
    June 4th, 2019

    Why do we use metric-type 1 in redistribute eigrp 100 command in this LAB?
    why not only “redistribute eigrp 100 subnets” ?

  35. Pira
    June 17th, 2019

    I took exam and passed 2 days ago! Thanks al of you. Thanks Philips for valid dump!

  36. Racko
    June 25th, 2019

    Where does OSPF 1 come from , why is the process number 1

  37. Anonymous
    June 25th, 2019

    @ Pira

    what are you doing you are also updating with user ” philips ” asking question and then answer

    Dear All

    dont believe user ” Pira & philips ”

    you will find such type of insects around the globe just ignore them

  38. Anonymous
    June 25th, 2019

    Dear All

    dont believe user ” Pira & philips ” this is one person commenting with different names

    you will find such type of insects around the globe just ignore them

  39. Anonymous
    July 2nd, 2019

    contact me for real valid dump: muhamadawan1988 @ gmail . com

  40. Anonymous
    July 4th, 2019

    default metric of E1 is 20. R2 and R3 both redistributed 192.168.1.0 with cost 20. R4 will choose R3 to reach 192.168.1.0. The metric should be specified in R3 when redistributing into ospf
    R3: redistribute eigrp 100 metric 84 metric-type 1 subnets
    84=20(default metric)+64(serial line cost)

  41. Anonymous
    July 7th, 2019

    What is the reason to use “metric-type 1”?

  42. Anonymous
    July 8th, 2019

    It will load balance from R4 to R1 if using E2

  43. Will
    July 8th, 2019

    It will not load balance if you use E2. That’s common mistake, because you can think that R4 will see 2 routes with metric 20 and will load balance, but that’s not the case.
    R4 will send traffic to R3 even if you use E2 routes (20), because it has lower cost to this ASBR.
    R4 – R3 – cost is 1 (FastE)
    R4 – R2 – cost is 64 (Serial)

  44. Tutu
    July 9th, 2019

    Is fa/0 of r3 facing r4?

  45. Anonymous
    July 13th, 2019

    @Will, you are right. there will be no load balancing because forwarding costs are different. but why “metric-type 1” is used in solution? i have seen a lot of dumps, the same thing is in each of them. i did the lab in EVE-NG and GNS3 and found no reason to use “metric-type 1”. if backward routing from R4 to R1 should be symmetrical it should be done other way. for example metric should be explicitly configured during redistribution on R3 with higher value, it can force R4 select path via R2. the question is what should be done on exam, because there is no kind of “full simulation” there. should “metric-type 1” be included into configuration on exam? because in real life it is completely useless for this case…. *confused*

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