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EIGRP OSPF Redistribution Sim

May 8th, 2014 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=10000 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 10000 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 31 32 33 26
  1. JennYC
    February 25th, 2017

    Hi guys, I just want to ask FOR THOSE WHO ALREADY TOOK THE EXAM

    does it really show a wrong OSPF process of 1? and you cannot change it? (like what we have downloaded)

    or you need to create a OSPF process of 23 and 24?
    Thanks guys and also how do you get the load when theres TX and RX load?

  2. JennYC
    February 25th, 2017

    Sorry guys dont mind the questions. I thought it was process ID but areas 23 and 24 XD

  3. Avi
    February 28th, 2017

    Do we add router ospf 1 or router ospf 24?
    please help am confuse

  4. DAP
    February 28th, 2017

    arrgg exam soon and getting more confused .

    redistribute eigrp 100 metric-type 1 subnets

    Is the 100 part of the above the eigrp process id which can be found in show run ?

  5. CCIE
    March 5th, 2017

    Yes, thats the EIGRP AS number (process ID is OSPF).

    So you are telling it to redistribute EIGRP 100 into OSPF 1.

    Remember to use the subnets command.

  6. scarlow
    March 5th, 2017

    I’m writing today and i doubt if I’m ready. I’m confident about all simulations but drag and drops are kicking my behind.

    Can anyone who recently wrote tell me which drag and drops should I expect??

  7. non-name
    March 7th, 2017

    Dear all,

    ı failed 300-101 exam( 750/1000).ı studied 149+41(takwa)+183.
    there are new about 10 f*king questins.
    All digitaltut lab is available.
    take care about exam.

  8. non-name
    March 7th, 2017

    failed

  9. non-name
    March 7th, 2017

    Dears,
    I failed today 750/1000.I studied 149+41(takwa)+183+Labs.But in my exam there was about 10-15 new f*king questions.
    All digitaltut lab are available.
    regards.

  10. Anonymous
    March 7th, 2017

    @non-name, you forgot Waleed’s 15q file. You will find his link through previous pages of the “share your ROUTE v2.0 experience” page…

  11. alim2017
    March 10th, 2017

    hello guys ,can someone send me the valid dumps for 300-101
    i’m writting my exam within four days.

    tsafongromuald at gmail dot com

    regards

  12. Anonymous
    March 10th, 2017

    can some one plz tell me what are the SIMULATION in route exam …plz help me iam writing in a couple of days

  13. JIG
    March 13th, 2017

    Hi, can someone explain why in the 1st CASE “metric-type 1” is used in the redistribute command on R3. That makes traffic to choose not shortest path (Ethernet Area 34) when coming back from R4 to R1.
    I think it should be just “redistribute eigrp 100 subnet” because when traffic going back would choose Serial area 24 because it would prefer E1 route over E2.
    Right?

  14. JOJO not so smart guy
    March 20th, 2017

    PLEASE READ********

    Hi Guys. Please send me latest dumps. I badly need it. please have mercy.
    Send me here:
    ciscoreview2017(@)(yahoo)(dot)(com)

    Thank you so much guys
    :( I’ll Appreciate

  15. Anonymous
    March 21st, 2017

    I had the lab with Fastethernet link, but I was not able to use distance command “distance eigrp 90 105”.
    When tried using question mark “distance eigrp 90 ?” it showed no avaiable options or description. I submitted the full command, it was visible in running config but no change in ip routing table happened. Traceroute was still the same via serial link. Finally I removed the command and go to next question.
    Most quesions are still valid. Maybe had some new ones. CHAP drag&drop .
    Pased with 790 points .

    @BEST EFFORT
    dont know if your still posting on this site, but that is exactly what happened to me. I figured out our problem we did not divide the delay by 10 its also why our distance command did not work, but the funny part is I got a 790 as well! I think if u have at least the configs in the sim, but it wont ping cisco gives u partial credit. But, I think in our situation the score just defaulted to 790 which sux, I know, I am still upset about it. It defaulted to 790 because cisco was not going to give us overall credit like I think these sims are worth 100 points so we should have got 890/900ish because 1000-100=900 . Now they were not going to be that nice and just defaulted the score 790 they know peeps study their asses off for this thing as I saw this as a pity (studied for an A and got a C) score.

  16. DAP
    March 21st, 2017

    to put the distance eigrp 90 105 command

    do you need to go into eigrp process id first ?

    Eg
    #conf t
    #router eigrp 100
    #distance eigrp 90 105

    or is it just in configuration mode ?

    Hope that makes sense

  17. Anonymous
    March 21st, 2017

    #conf t
    #router eigrp 100
    #distance eigrp 90 105

    did that , it was not the problem if u read please stay abreast

  18. DAP
    March 22nd, 2017

    I was wondering as starting to doubt what i did the last time i attempted the exam

  19. san 2017
    March 23rd, 2017

    Hi Everyone,

    Please share this dumps 149q+41q+15q or any latest valid dumps if available.

    san242721 @ gmail com

  20. Laksh
    March 26th, 2017

    Hi All,

    I give my exam on 23rd of this month. On sims after implementing the configuration, copy running start-up command is not worked for 2 sims. I claimed same with exam instructor. But He is trying to call pearson guy to check but my exam time was on going. It was nightmare. Finally my time got over. I got 690 marks. My two sims EIGRP OSPF Redistribute and OSPF sim worked fine. but unable to save it. My two SIMS almost 200 marks lost there itself with their mistake. I suppose to get 890 marks. Could you please tell anyone how to claim if there’s mistake ? and also confirm what is the marks for each sim ??

  21. waheed ullah
    March 29th, 2017

    hello everyone

    please can anyone send me CCNP route update dump.

    here is my email
    {email not allowed}
    i need the update dumps so much
    thanks

  22. waheed ullah
    March 29th, 2017

    w a h e e d f a c e b o o k @ g m a i l . c om

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