CCNA EIGRP LAB Question
Question
After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.
The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.
Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco.
IP addresses are listed in the chart below.
| R1 Fa0/0: 192.168.77.33 S1/0: 198.0.18.6 S0/1: 192.168.60.25 S0/0: 192.168.36.13 |
R2 Fa0/0: 192.168.60.97 Fa0/1: 192.168.60.113 S0/0: 192.168.36.14 |
| R3 Fa0/0: 192.168.77.34 Fa0/1: 192.168.60.65 Fa1/0: 192.168.60.81 |
R4 Fa0/0: 192.168.60.129 Fa0/1: 192.168.60.145 S0/1: 192.168.60.26 |
Answer and explanation
(Note: If you are not sure how EIGRP works, please read my EIGRP tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial. Note: You can download this sim to practice here: http://www.9tut.com/download/9tut.com_CCNA_EIGRP_sim_question.zip)
We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command
From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.
(You should check the AS numbers on other routers for sure)
To solve this problem, we simply re-configure router R3 with the following commands:
R3>enable (you have to enter cisco as its password here)
R3#configure terminal
R3(config)#no router eigrp 22
R3(config)#router eigrp 212
R3(config-router)#network 192.168.60.0
R3(config-router)#network 192.168.77.0
R3(config-router)#no auto-summary
R3(config-router)#end
R3#copy running-config startup-config
Check R1 router with the show running-config command:
Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router
R1>enable (you have to enter cisco as its password here)
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#end
R1#copy running-config startup-config
Now the whole network will work well. You should check again with ping command from router R3 to other routers!
Modifications:
Maybe in this EIGRP Sim you will see the “passive-interface …” command somewhere in R1 configuration. If the link between R1 to R2; or R1 to R3; or R1 to R4) routers has the “passive interface” then we have to remove it with the “no passive-interface …” command because it prevents EIGRP update from being sent on that interface. But if the “passive interface” is applied to the link between R1 and ISP router like this:
R1:
!
router eigrp 212
passive-interface s1/0
!
then we just leave it. Don’t use the “no passive-interface s1/0″ on R1 because the link between R1 & ISP doesn’t need EIGRP to run on it. A static route from R1 to ISP & “ip default-network” command in R1 are correct so that all the routers (R1, R2, R3, R4) can access the Internet.
(Note: The “ip default-network” command in R1 will advertise the static route of R1 (to go to the Internet) to other routers (R2,R3,R4) so that they can access the Internet too). In the exam you will see these lines in R1 configuration:
!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
If you want to learn more about “ip default-network” command please read: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml
I read recent comments and realized that you will see the “passive-interface” in the link between R1 & ISP router so just leave it.
Note: Also some readers confuse about if we should use the wildcard masks on the “network” statements under EIGRP process or not. For example should we use:
router eigrp 212
network 192.168.77.0 0.0.0.3
The answer is: we can use wildcard masks or not, it does not matter. Not having a wildcard mask does not make the routes conflicting. The “network …” command in EIGRP (and OSPF, RIP) does not means “advertise this network” but means “If I has interface(s) belongs to this network please turn on EIGRP on that interface. Therefore when you don’t use wildcard mask EIGRP will turn on EIGRP on all interfaces that belongs to the network you specify in the “network …” command.
You should only use wildcard mask on EIGRP if you have 2 or more interfaces that belong to the same major networks but you don’t want to run EIGRP on all of them. For example if your router has 2 interfaces whose IP addresses are 192.168.30.1/28 and 192.168.30.17/28 but you only want to run EIGRP on the first interface, you can type “network 192.168.30.0 0.0.0.15″ under EIGRP process.
Other lab-sims on this site:
CCNA Configuration SIM Question (RIPv2 SIM)
Hi 9tut and all,
Thanks so much for all the guidance, did n passed my exam today 933/1000, all thanks to 9tut for the valid questions and solutions. i highly recommend this site to anyone and everyone studiyng towards Cisco certification.
Keep up the good work.
My SIMs were EIGRP, VTP ACL2.
AS 12, new router AS 22, the rest is as in 9tut, but for different IP addresses.
VTP 5 Qs topology as in 9tut.
ACL, Host C should access Finance web server via web, but is denied via any other means, other hosts in LAN, and Core are denied access to Finance server, but can access finance server.
All the best to all planning to sit the exam.
hi every one i wanna know is the CCNA exam just like this MCQs cuz any exam i practiced was just an option or multioptions i mean does it just go like this the whole exam ?
I just passed my CCNA – 841 – EIGRP Lab was broken. I took the CCNA since I needed it to finish my CCNP and have my CCNP now. I couldn’t even form a neighbor relationship with my next hop router (which I could ping) and there was no passive-interface [default] anywhere. Very odd. Not sure how much the SIM was weighted, but I am sure (since I pretty much got everything else right) that it was weighted pretty high. Good luck to all!!
Also, to add on, when I would do a sh ru, and scrolled, the interface ip address information was gone. Crap-A$$ SIM IMHO. They should do better since these tests are 295/attempt.
to xallax and 9tut.
is there a possibility in ccna exam that it will ask you to have a ping command work on R1 and ISP router?
please advise. thanks in advance.
Hi Hiccup,
I experienced the same problem with the EIGRP lab, i changed the AS number on router 3 as per instruction from this site, but it still doesnt form a neighbor relationship with the other routers. I run show running config on router 1 and verified that there’s a passive interface command. I tried to disable it by running no passive interface serial 0/0. but it didn’t accept the command ” the message is something like” unable to run the command on the current IOS version” I use the question mark to make sure that i’m typing it correctly. And i’m sure i ‘m doing it right… But it really won’t accept the command, until i gave up and focus on the rest of the exam..Fortunately i stil passed and got a 907 mark.. I really do think that this is a glitch in the exam.. and this error should be corrected by Cisco since we all know how valuable lab simulations are in the exam..
@9tut hope you could help us specially the aspiring exam takers, do we really need to reconfigure the router as what Hiccup did on his?
Regards,
Tophski21
@Tophski21 and Hiccup
I received the same error message “unable to run the command…” when I did a config t on R1. There was not passive-interface on mine from R1 to R3 and vice-versa. Very frustrating as I spent 30 mins and finally gave up since I realized that I had 40 mins left and 30 questions left and didn’t know how many more SIMs I had to complete at that point. Luckily I moved on since I had 2 more SIM’s and only had 5 mins left when finishing Q48. Other than that SIM, the test was quite easy. There was 1 question I didnt know how to answer. It was stated like “an office is setup with 3 AP’s to cover the office in wireless completely, was technology was used – IBSS, BSS, ESS or SSID? Just throwing that out there for others to answer in case they run into it.
@jay
no, you won’t be asked to do that. you just have to make the network operational
@SeeMeShakinMyHead
An ESS WLAN is an Extended Service Set WLAN. It uses many Access Points. Thats it.
BSS is a Basic Service Set, which uses one AP. SSID is just the Name (Service Set Identifier.) IBSS is an Independent BSS ( also called “ad-hoc”) – many hosts can communicate with each other with no access points involved.
Got that from Train Signal videos
@ 9TUT
Good job thanks for your explanations. pls with respect to eigrp lab, how do i remove unwanted network from a router? pls reply, am taking exam tomorrow
@ D1
You just apply
router(config)# no network 196.25.36.22
I did all the things which are mentioned above but i am unable to ping any ip except for 192.168.77.33 from R3. Any idea?
hi,
is this eigrp sim here is working properly? i tried to do a practice but when i checked the as they all set to 212 and can ping all the routers with 5/5 reply…and how to know if there ” passive-interface” in the router, can i use sh run command?..i can’t it here when i used this command..
anyone can plese help me with these..thank you so much
@Anonymous
Yes this lab is working fine and after configuration you can ping each other and can see the result as ping replied 5 times with 100% success. In fact there is no “Passive-Interface” in this EIGRP lab. You may see the “Passive-Interface” in exam that is connected to the ISP directly, which you should not do anything with that, just leave without configuration. If you see the “Passive-Interface” that is connected with other routers or in the same router R1 execpt ISP connection; In this lab you can see the ISP is connected via S1/0, if you see F0/0 is configured with “Passive-Interface” than you have to remove it…………………… command with the example given below………. like:
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#network 192.xxx.xxx.xxxx
R1(config-router)#end
R1(config-router)#copy running-config startup-config
After finish typing that above, you should automatically see this notice “%DUAL-5-NBRCHANGE: IP-EIGRP 212: Neighbor 192.168.36.14 (fa0/0) is up: new adjacency”
To confirm if the passive-interface has been removed, just do a “show running-config” again and double check.
Maybe in the exam you will only see the “passive-interface” between ISP & R1 routers and we just ignore it.
I hope it will work for you !!!
Regards,
Thapa
Kudos ! 9tut!!, the stuff you got here is fantastic!!, Today was my day and i made it (scoring 890), First attempt!. With your LAB SIMS , one cant go wrong.all the best guys, with 9tut you wonna make it too. To start working on CCNP!
@Thapa,
Thank you so much for your help i really appreciate it..thank you so much :)
Just one more thing if that ok :),
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#network 192.xxx.xxx.xxxx
R1(config-router)#end
R1(config-router)#copy running-config startup-config
in the network 192.xxx.xxx.xxx is it the ip add of int fa0/0? ( R1(config-router)# no passive-interface fa0/0)
once again thank you so much for your help :)
Hi, im taking CCNA next week,i’ve been reading this link some weeks ago and see ppl talking bout dumps. Can anyone send me the dump guys? It may help me pass it… Thx!
@Anonymous
Yes ……………
Thx anonymous, can i take a look at them b4 take the exam? Here my mail: Panduit30@yahoo.com.
Thx so much i really apreciated it!
@thapa
am confused about ur question on CCNA.COM ….is it another sim we should expect in d exam,or that a question for a different certification am realy confused pls let me know cos am taking my exam on monday nd dnt wanna fail.Thanks.
Hi, I have two questions. First, on the real exam if we see that we dont have default network and statis route, should we configure it by ourselves or not? Second, if there is not even a passive interface from R1 to ISP, should we configure it or leave it unchanged?
@isaac what is that question?
we need to see the passive-interface to remove if it is there with other routers interfaces. You need to see the interface may be s1/0 is having passive-interface, which is connected to the ISP than no need to do anything with it. If you see passive-interface except the interface S1/0 according to this scenario given above than you need to remove passive- interface with the respective interface.
@isaac read this information given below, which may helpfull for you
it is posted by @John
@thapa
Ques
CCNA.com has recently adding the MAIN ROUTER. Currently, the MAIN ROUTER does not have connectivity to the ISP router.
–> This ques.was in my today’s exam
check AS no. on MAIN Router, Add networks with no auto-summary & SAVE
On Campus Router check Defult routing Entry for internet connectivity(use sh run). if not then you have to configure. In my exam its there.
On Campus router Remove unwanted Networks dont remove Internet address & Add Missing networks on Campus (R1) Router & Save
Dont ping internet address on running conf of both router it will not work 1st SAVE both router configuration and check. it will work.I did this n Got 100%
@ thapa
thanks so much my guy for this piece of info,am siting 4 d exam tomorrow,will post u my results when am done, thanks.
@isaac
GOOD LUCK !!!
is the questions become on the exam as same as questions here on 9tut …. please feed me back
NO Mostafa: It does not! OK here you go rest of the team: EIGRP SIMULATION: After adding R3, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly. Why do I have to go to other Routers to check their config while its clearly says ” All other inter connectivity and internet access working properly” by reading that I think I should only get on with the new added Router or I am WRONG please shed some light if you can! Many Thanks
USA has recession and so the EU !!!!!!! so they making money from us by hook or crook this is what they are doing. Exams are very EXPENSIVE if you guys agree or not but hey I am in no DOUBT now!
so BMW should i study all laps from cisco material to answer international labs :(
there isn’t any predictable labs
I got this sim in my exam. It had a tiny trick in it.
R3′s link to R1 was 192.168.0.30/30
R1′s link to R3 was 192.168.0.29/30
In R1 there was the following error:
router eigrp 212
network 192.168.0.30
all that needs to be done is:
router eigrp 212
no network 192.168.0.30
network 192.168.0.28
Thank you 9tut ^_^
@baron..tnx..i figure it out how that happen..the .30 is not a network..but rather it belongs to network 192.168.0.28..good job!
Baron@ Yes I did yesterday as well cannot recall if we had to put the ip add on serial int of the Manage router do you think it was missing? Because i hvae done the same!
@Thapa
i made it with 973/1000.thanks a lot,starting ccna security right away.
@Baron Are u sure about .28? in the above SIM RS has 192.168.77.33/30 and R3 has 192.168.77.34/30. If what u’re saying is true then R1 should be 192.168.77.32/30, right?
@Mostafa, YES labs scenarios are the same but with different requirements so you must understand the concepts. Now they keep on changing the statements on LABS so you dont just remember by heart as I said must improve study methods since CCNA now a days is very demanding and requires huge knowledge” Trust Me”. Good Luck. Khuda Haafiz
wao thats good
@ baron
R3 & R4 are directly connected ,,,,,so i think its not necassary to configure network address
Hi, I failled today,
How much the retaking payment??
@yilmazonur2
$295 only……….
Hi guys i feld with 788 & retaking am i going to find sims plis help thanx (greensonchalumba@gmail.com)
Taking it tomorrow!!
lol I guess its today!… been studying too long lost track of time.
Hi all, just finished today with 978/1000, thanks to 9tut really good website, also examcollection.com, labs i had today : this eigrp, and switches, questions was about half from here and half from examcollection, thanks to this wonderfull website i passed as well :D
Hi xallax,
I passed today with 920 points, thank you very very much for all you did am very grateful. I encountered 1 problem in the EIGRP lab, i was asked to provide connectivity from R2 to ISP. I configured the correct AS on R2, and manage to get routing update from R1 to R2. But i still can’t be able to ping the ISP, i realized that there was a wrong subnet mask of 255.255.255.240 instead of 255.255.255.252 that’s supposed to be on a WAN link. I tried to get into the interface serial 1 of R1 connected to the ISP. But the router just refused to accept the command, i tried in several ways in the end i have to leave it without making connectivity to the ISP. How do you think i should have solve this problem
@somebody
add a default route that leaves out the interface that connects to the ISP router
Hi guys, i just passed the test today with 947/1000. The sims were ACL2, EIGRP & VTP with minor ip address change. There were about 4 new questions, 1 was on frame-relay but i cant remember the question exactly. Who ever can remember them should please update.. Thanks 9tut and everyone!! Wish you guys the best….
enable
config t
hostname R2-RC
enable secret cisco1
line console 0
password cisco2
login
exit
line vty 0 4
password cisco3
login
exit
interface f0/0
ip address 209.165.202.158 255.255.255.224
no shu
exit
interface s0/0/0
ip address 192.0.2.30 255.255.255.240
no shu
exit
router rip
version 2
network 209.165.202.0
network 192.0.2.0
passive-interface f0/0
no auto-summary
end
copy run start
@somebody
You would need a nat to be able to access ISP. 198.0.18.4/30 is public ip space. You would have to nat to ping from the 192.168.X.Y subnet to the ISP 198.0.18.4/30 interfaces.
If you got a 920 I would say you got it right whatever you did on the sims.
Good job.
Hey guys,
I have an EIGRP LAB sim for Linux, you can download and run it in your linux OS (recommended Linux OS are CentOS and Debian)
http://www.mediafire.com/?97x97lu7ghkib96
enjoy!