EIGRP OSPF Redistribution Sim

id like to ask the same question as anonymous1…. Please assist and enlighten us.

Why you redistribute ospf in eigrp with specifc metric ? “redistribute ospf 1 metric 1 1 1 1 1″ works just fine.

Why you specify metric-type 1 in “redistribute eigrp 100 metric-type 1 subnets”? Default metric-type 2 is fine as well.

Is it necessary to do a “copy running-config startup-config” at the end. What is you forget to do that ?

becuase : without metric-type 1 the route will goes to ospf domain with defulat metric Type 2 is the default

type 2 (default) don’t calculate metric inside eigrp only inside calculate metric inside ospf domain so
if without metric-type 1 the routes from R2 and R3 goes to ospf with the same metric and no best in this case if the link the same inside ospf , so i think u must specify the metric type 1 to calculate metric to find best >> and why under R2 eigrp AS cuase the routes from R1 not prctically to goto R3 to goes to ospf domain

why use 105 in the distance 90 105 command? I understand eigrp default is 90. But not sure why change it to 105. how do we come up with the number 105?

plz tell me the purpuse of this command ( distance eigrp 90 105 ) in those routers we will apply and why for which network this command is select best path
plz guide me detail

@ Johncc42, @ amir

When you type this command under EIGRP process you telling the router to lower Administration Distance (AD) for external routes. In distributed router if the same route comes from different links with AD 170 and AD 110 router will choice route with lower AD. So when you configured router with ( distance eigrp 90 105 ) you are telling the router lower AD 170 to AD 105 of external routes, and the router will choice path with AD 105 because is lower AD. I hope this been helpful for you.

thanks a lot
johnccc42

I’ve taken the exam on 18th January 2012 and want to share one fact about the “EIGRP OSPF Redistribution Sim” (that was also pointed earlier by Parvez), it is clearly mentioned that R1 needs to choose best path to R4. So it should be via R2->R3->R4 instead of R2->R4 becuase connection between R2 to R3 and R3 to R4 is 100000 Kbit bandwidth. while connection from R2 to R4 is serial connection of just 1540 Kbit bandwidth. There is an extra configuration that i’ve applied on R2 to accomplish this goal. it is following:

R2(config)#router ospf 1
R2(config-router)#distance ospf inter-area 171

Confirm the action by running traceroute from R1 to 172.16.100.1/24 network. It should go via R2->R3->R4.
this goal can also be achieved by doing the following configuration on R2 instead the above one:

R2(config)#router eigrp 100
R2(config-router)#distance eigrp 90 110

Just passed 642-902 like 1 hour ago. Thanks fo Examcollection and Digitaltut.

Thanks to Miles.
to naveed004: should distance eigrp 90 110 be changed to distance eigrp 90 105 so that it is lower than 110.

@ johncc42

I just passed exam today. I used distance eigrp 90 105 .
Router 2 immediately switch going to router 3 to router 4. Just little bit change on router they have add more routes you when you use show ip router you will see a lot’s of routes so don’t panic the concept of config is still the same as above. One more thing make sure you use command : show int f0/1 on router 3 because the changes always the interface performance as is mention above. Also Naveed004 explaining very clearly each of config works because I tested before going to take the test on my GNS3 lab.

Thanks to all and specially to Digitaltut.

Hi,,,

I passed on 21st Sat.I got 4 lab-eigrp-ospf ,ipv6 ospf,ospf stub,pbr.nonentity.vce is still valid one.Thanks to digitaltut.now preparing for final paperTshoot.
guys be carefull while giving exam.dont panic.config is same only ip was different.

Best of luck .and once again thaks to all who gave useful comments..

I dont see that EIGRP has any redistributed route .If R1 would have any route that is redistributed the AD would be 170 and suboptimal routing would take place and ospf would be prefered for that route and would be n the routing table .

As I can see this is not such a case is it ?
Please some comments to convince me that I’m wrong.

I meen besides OSPF route of course.

Besides route can be manipulated with Policy-based routing as well on R2 .That is what I would do .Anyway I dont know what is required on the Exam .

Using the exact config as POONAM suggests the icmp request packets wil go R1-R2-R4 and the icmp reply packets will go R4-R3-R2-R1.

To make R4 choose R2 as a next hop for R1 connected networks use the metric-type 2 when redistributing in R3, since E1 routes are preferred over E2 routes. If you use metric-type 1 on both redistribution points than R4 will prefer R3 because of the higher bandwidth value on fastethernet interfaces comparing to the serial interfaces (10000>1544).

The metric used when redistributing into eigrp does not have any effect in this scenario because the routes R3 redistributes from ospf and advertises to R2 will always be unreachable in the R2 eigrp topology due to ospf lower AD comparing to EX EIGRP. So, any values you choose will work.

Did you guys use “router ospf 1 or router ospf 24 ?

If i do a “do sh ip ospf int” and the process ID is 24, does that mean i should use that for
“router ospf 24″ ?

Or say do a “sh ip ospf database”

OSPF Router with ID (192.168.3.2) (Process ID 24)

Does that mean when i do a “router ospf XX”, the XX is 24 ?

It is not assumed to be 1 in the exam, right ?

passed today with 953, same sim as mentioned above.
add
R2(config)#router eigrp 100
R2(config-router)#distance eigrp 90 110

copy run start will nt work.

yes, that’s correct, because the connection between R2 and R4 is just a serial link (slower than fast ethernet), therefore, much better if we will use the link from R2 and R3 to reach the 172.16.100.1 because the metric is lower.. the comand is:

R2(config)#router eigrp 100
R2(config-router)#distance eigrp 90 109

because 109 is lower than 110 (OSPF AD)

I made 642-902, many thanks for creating this nice webpage.

ASALAM THANKS TO ALLAH TODAY I HAVE PASSED IN Implementing Cisco IP Routing (ROUTE) EXAMS SCORING 883/1000 ON YESTERDAY & THANKS ALL FRIENDS FOR PRAYING..PREPARED THIS DUMPS & YOU WILL GET MIN 883 MARKS THE LINK =
http://www.4shared.com/office/J1iP8WU_/642-902.html

Just passed the exam :)

The link between R2 and R3 was not a serial link, it was a fast ethernet one .

Passed 930/1000 Took exam 2 hrs ago, sims were IPV6 Virtual Link, Redistribution, Policy Based Routing, and EIGRP stub, no simlett or hotspot one D&D and a whole lot of questions not on this site. I got about 10 questions related to BGP that I had never seen before. Know your BGP is my recommendation.

Is everything on R4 completely configured in ref to Loopback 172.16.100.1? Do we have to do any R4 configs?

You certainly have some agreeable opinions and views. http://bestipshot.blogspot.com provides a fresh look at the subject.

guys can you please re-write the whole configuration for R2??? I’m a bit confused

@Shahid,

thank you for sharing us this reviewer, i will take exam next Saturday, and i will inform all of you guys if there are some changes on the exams, thank you and God Bless us

guys can you please re-write the whole configuration for R2??? I’m a bit confused

Metric type 1 will lead to the required” R4 will choose R3 not R2 because both will inject OE withbmetric 20 and then add the link cost so R4 will chosse R3, so there is no need to change the admin distance.

Also the change in the Admin distance affects its originator path selection not his neighbor path selection, if you want to do that so it will be made on R4 itself

And unless R4 isn’t a border router so no need to change the distance

Dear all
i pass the exam today with 1000. most of question came form digtaltut.com and 2 new questions form http://bestitshpot.com, i got 3 LAB. also the above lab and i used eigrp distance 90 105. so it proved as i got 1000. jus see the question carefully about it is saying used the high bandwith and also it is mention in the blog bestitshop.blogspot.com. plese see it.
Thanks and good luck to all.

Sorry it correct link to page.
Dear all
i pass the exam today with 1000. most of question came form digtaltut.com and 2 new questions form http://bestitshop.blogspot.com/2012/01/ccnp-route-642-902-latest-question-7.html, i got 3 LAB. also the above lab and i used eigrp distance 90 105. so it proved as i got 1000. jus see the question carefully about it is saying used the high bandwith and also it is mention in the blog bestitshop.blogspot.com. plese see it.
Thanks and good luck to all.

Hi, I passed the exam last week aswell with 1000 points, got 4 labs. I used eigrp distance 90 105 aswell as text was saying use the high bandwith. Please also check the bandwidth and delay on the Fasternet when doing the redistr. on R3 for your K values. Bandwidth was 100000 and not 10000 and delay was 100 us so for your delay K value becomes 10. Also LAB policy based routing, check on which interface you apply the policy as it was not a f0/0 but a f0/1. Many thanks to all ! this is a great site and thanks to digitaltut !

Dears,

Why are we doing mutual redistribution in 2 points?
This may lead to the risk of routing loop without using any route-tag or filtering.

What I did on GNS3, I configured only redistribution from OSPF to EIGRP on R2
AND
Redistribution from EIGRP to OSPF on R3 and the ping from R1 to 172.16.100.1 was successful.

I think this makes sense. Please tell me what you think about that.

I passed the exam yesterday :-) and this lab was appeared on the exam :-)
Good luck and God Bless

@mustafa

at first time i saw thinking the same, but if you look at your solution than you see that the echo packet goes
R1 R2 R4
and the replay
R4 R3 R2 R1
thus you have not realize a bidirectional path and everywhere on cisco books i found that this is not a recommended solution.

please correct me if i’m wrong