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)
and thanks every one here share experience and discussion
i took the exam yesterday and failed.. i know that i have to configure EIGRP on router main and R3.. the problem is i wasnt able to configure R3.. telnet is not supported and i was trying to click the R3 icon but it is not clickable. what happen there? can someone please tell me..
@Louie:
I m very sorry for that,
were there any computers connected to the main and R3 via console cable?
Thanks
THANKS TO 9TUT AND CREW
I PASSED WIT 920 TODAY
@mike why you shared your exam idea please advise us. your comment is not enough.
dumps still relevant,vtp, nat 2,eigrp were the questions.
its good to understand the concepts i think
sorry i got acl,vtp and eigrp not nat
the questions were just thesame concept,my vtp ACw3 is the root switch, so that made the job easy.
@mike:
please what does it mean nat 2?
any body who needs the dump shu ask.they are relevant, thou i met 2-3 new questions.
shegsytom@yahoo.co.uk
we use to have 2 nat questions on this 9tut
so 2 means the 2nd question
@mike:
alright i thought Nat 2 was among acl,vtp and eigrp.
Thanks for your precision.
@Mike thank you dude. i will contact you soon.
@9tut: Will you definitly find the AS on router 3 by using the show running-config command? And will it be 22 or may the numbers differ in the real exam
@;D: Surely you will find the AS number with that command. But maybe it will not be 22 :)
@9tut
Please i don’t really understand how the passive-interface works; if it exists between the R1-R2 link or (R3, R4), how will i know and how do i remove it? How do i also know if it exist on R1 – ISP link?
Also, i wrote CCNA about a year and half ago, will i get the same questions i got then or questions from the current dump (i just thought of it and wanted to be sure, that’s why i’m asking).
Please help because i have registered again for the exam and it is next tomorrow.
Thank you for your prompt response.
@Bohseh
Passive-interface: Interface will NOT send Eigrp updates.
If you want the an interface to participate or send updates, then use the NO passive-interface command on that particular interface.
Eg.
Router(config-router)#passive-interface fa0/0……Not participating or sending updates
OR
Router(config-router)#no passive-interface fa0/0…..Participate or send updates
Hope this helps. Thanks.
I did my exam yesterday 24thnov…n i passed
sims were VTP, acl2 n EIGRP AS no. 221.
ACL: with different ips….192.168.202.2
1)host B (192.168.202.2) allow to access f.server (172.22.71.17)
2)deny all other access to f.server
3)allow other access to webserver
access-list 100 permit tcp host 192.168.202.2 host 172.22.71.17 eq 80
access-list 100 deny ip any host 172.22.71.17
access-list 100 permit ip any any – got 100%
VTP i got:
q1,3,4,5 n 7 from vtp sims in 9tut. questions given in vtp r same bt wen u type sh commands the ans r different. q7 i had SW3(7rvsn) with higher revision num then sw-x(6rvsn) n also options of q 7 were nt full sentences like replace n existing words were deleted so for a while in my exam i was confused wats the ans bt i did it.
i would advice u all who is taking exams to learn ur sh commands in vtp n how to look for answers coz all the answers are in ur sh commands.
EIGRP is soooo easy n same as 9tut sims bt with different ips n AS number.
one new q was wat is the benefit of replacing ipv4 with ipv6…
also asked abt inverse ARP
Got 5 drag n drops so easy all from 9tut.
i hp this helps u all..
THANKS TO U ALL FOR HELPING ME n for sharing ur experiences
@Bohseh
wen u type sh run command on router 1 it will say passive-interface on s1/0 from the the table n exhibit u will know that s1/0 link is between R1-ISP.
Same if its between R1 n other routers u will see passive-interface on their fa0/…or serial interfaces.
hp that helps
@Koffy
Thank you so much for the explanation, i quite understand it now.
@Christina
Congrats on your success in the exam, i got your explanation right, thank you very much.
i’ll plan to give my xam on 29th…but i m quit nervous dat …m i prepared 100%
pls suggest me d best way & also suggest me future prospect in dis field.
thank u!!!
guys can some one help me this
how can i connect a network wich is running EIGRP as a routing protocol to the ISP , how i am going to configure the static route on the ISP or the main router , the default route,
please some one help me ,
@9tut please explain for me because really i am very worry about this
@abidbasid
u dnt need to configure anything at isp, static is already configured in the sim…..u just need to configure the error which is eigrp 22 or any num they giv u.
i hp this helps
I tried doing this sim and I’m so happy I figured out the 2 problems. I just like to clear out what you said about advertising a static default route to other routers with this:
!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
With this command the default route is not being learned by R2, R3, R4.
The command should be:
!
ip route 0.0.0.0 0.0.0.0 198.0.18.5
router eigrp 212
redistribute static
!
to all: Challenge yourself and use this network to configure NAT Overload (PAT).
But first you must remove the 198.0.18.0 network in the route advertisement of R1 (disable the interface from participating in the eigrp process). Instead you must configure a static default route in R1 to get to the ISP and advertise this route to R2, R3, R4. Then configure NAT overload on R1 to translate the inside network to 198.0.18.0 network.
To test if the the inside network can access the ISP, configure a loopback interface in ISP (e.g. with address 1.1.1.1 subnet mask 255.255.255.255) and ping this address from one of the host in the inside network.
hello, kindly send me the latest dumps, ill be taking my ccna exam on Dec 8,2011
tapamintz@yahoo.com
today still the same sims : vtp , acl2 and eigrp
Eigrp sim:
New router :
no router eigrp 22
router eigrp 122
network 192.168.44.0
network 192.168.80.0
Main Router:
router eigrp 122
network 192.168.44.0
ping from routerX all interfaces on all routers . done got 100%
pasive interface only on the Wan link – leave it like it is
Vtp sim:
Sw3 was the root bridge. all ports in desgn. mode
Sw3 had higher revision number than Sw-X
got 100%
acl2 sim:
1. allow host b to access web browser on financial web server
access list 100 permit tcp host 192.168.33.2 host 172.22.228.17 eq 80
2.Deny host b from accessing any other service on financial web server
Deny core to access financial web server
access list 100 deny ip any host 172.22.228.17
3.Allow all other traffic from host c core to reach Public web server
access list 100 permit ip any any
dont use : access list 100 permit ip any host
got 100%
I saw a new question :
how to see a debug command on a remote device? or something like that.
Thank you everyone… especially to 9tut.com, i would have not passed the exam if not with your help. Passed today with 947. Sims were ACL2, VTP and EIGRP. Used http://www.9tut.com and the 486 vce file to prep for test. There was about 3 or 4 questions that were not in the 486 dump on exam today.
@maria
are you referring to “terminal monitor”?
can everybody share me latest dumps,????
i did not pass ccna last month.
but i will sit 21 december again.
lawkanat28@gmail.com
it is important for me, so please help me.
Thanks a lot.
last time, i have no practise with lab, i think it must be problem.
can everybody tell me how to practise labs to be smart enough for exam.
plz send me mail.lawkanat28@gmail.com
Thanks.
@lawkanat…..practice acl sim/lab my way below…..if u understand then u will definitely pass.
the easiest way to work out how to config acl in exam is this way:
Ist we use normal acl in pink:
sh run
enable
password: cisco
config t
1)access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
2)access-list 100 deny ip any host 172.22.242.23
3)access-list 100 permit ip any any
interface fa0/1
ip access-group 100 out
end
copy running-config startup-config
now mainly in exam the modificaion is required in acl statment 2) n if they say via web brower/http then u use tcp n eq80 otherwise u use ip n no eq80 at the end of 2)acl statment. The 1)statment is always same except the ip address given r different.
lets go back to acl statment2), this is how i did my revision of acl for exam:
In exam if they ask:
Deny all access and access through given host(A,B,C or D) to F.server, ur statment shld be
access-list 100 deny ip any host 172.22.242.23
Deny all access through given host (A,B,C or D)
access-list 100 deny ip host 192.168.33.3 host 172.22.242.23
Deny given host (A,B,C or D) from accessing other servers
access-list 100 deny ip host 192.168.33.3 host 172.22.242.16 0.0.0.15
through host- means all accesses that is gng through or using that host to access the info.
(172.22.242.16 0.0.0.15 u need to knw how to calculate wildmask if different ips r given)
if u understand my above way of acl configuration u will definetly get 100% in ur acl question.
Onlu u need to make sure is wat host is given n ip addresses.
I hope this help u to pass ur exams.
Why we don’t add int-s f0/0 and f0/1 on R2 and R4 and f0/1, f1/0 on R3 to passive interfaces?
@Rasim
The reason is…….. these interfaces must participate or send routing updates(Receiving/Sending) to their neighbors.
You configure “passive-interface” on interfaces you want to prevent sending or receiving routing updates. Thanks.
@ All
does it make any difference if we use “no auto-summary ” on router 1?
Today I pass the test and I score 907 points.
Thanks to 9tu9 and dump I had “by ACME dima dima”,
But I suggest not only count on the damp
I was learning a lot from cisco training school &internet.
I had 3 labs – eigrp+acl2 +vtp
I had 4 new question about Nat that I haven’t seen it in the internet
A lots of subneting ,frame relay ,drag and drop for Osi model
So…good luck for every1
i passed today alhamd llah , all the qustion from this dumbs and the labs was three: acl2 , eigrp , vtp
but i advice to try to pracit the labs more then one and read the qustion carfully.
thanks Collisio and exam collection and 9tut.
@ 9tut and xallax.How do i resolve this;Refer to they EIGRP exhibit on this site.After adding R4 router, no routing updates are being exchanged . All other inter connectivity and Internet access for the existing locations are working properly.The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers including ISP router.
I changed the AS in R4 to match all the routers in the exhibit and checked to ensure that all the network statement are properly configured,passive-interface was configured on R1,i tried using no passive-interface but i was getting an error and i couldnt ping the ISP router from R4.What steps do i take to resolve this.Also i would appreciate an explanation of different scenario of EIGRP problem when passive-interface is configured and when it is not configure.I really understand the question here in 9tut.Thank you.
@sage
hey there
send me an email with your practice topology at numiplaci@yahoo.com
will reply in 5-6 hours, kindergarten practice day :D
2 day i pass the exam i got this sim
Tks 9tut
router eigrp 212
passive-interface default
network 192.168.36.0
network 192.168.60.0
network 192.168.85.0
network 198.0.18.0
network 192.168.77.0
no auto-summary
when type show run in router R1, come like this. so in this situation what i want to do about passive-interface???
please can someone make me clear????
pl can someone explain me about using no auto-summary??
In the router R4, 192.168.60.0 is the one and only network. so in that situation should we want to set no auto-summary??
i don’t understand how the passive-interface works. if it exists between the R1-R2 link or (R3, R4), how will i find it?? pleace someone clear me??
@chokka
yes, otherwise the router will advertise 192.168.60.0/24
@bakki
passive-interface suppresses routing updates being advertised out of a particular interface
Hi,
I also got the configuration of router like what chokka told.
router eigrp 212
passive-interface default
network 192.168.36.0
network 192.168.60.0
network 192.168.85.0
network 198.0.18.0
network 192.168.77.0
no auto-summary
how to know the the existence of passive interface between routers R1 – (R2 or R3 etc)..
Can somebody please explain me
Passed CCNA 640-802 with 881! Thanks, 9tut and all participants :) I had 3 Labs Eigrp, Switch operations and ACL2.
@rakhy
show run command will tell you if an interface has been marked passive. It is under the routing protocol like this:
router eigrp 212
passive-interface FastEthernet0/1
network 192.168.77.0
network 192.168.60.0
that command will mean no routing information will be sent out of that interface, preventing an adjacency from forming. You DO want this command on interfaces attached to an ISP, or to a LAN though.
had my exam yesterday and i did 785 total fail :(( there is something that i need to tell you tough: i had this simulation with eigrp, and when i did try to issue the command #no router eigrp 22 , i got a line that said “this command has been deactivated from the router’s R2 interface” and kinda blew me off. what other approach to solve this problem whas there? the AS was wrong for shure, i checked on the other routers too and it was 212. please let me know in case i’ll get over the depression and try to take the exam ever again. thank you
@9tut please explain eigrp campus router example?
@sasha
Can you confirm that you got this message on R2?
Wasn’t it R3 that has the bad AS?
Maybe that’s why it was deactivated on R2. If it was in fact R2 that had a different AS than all the others and you couldn’t change its AS, another option would be to try to change the AS in all the other three to match R2′s AS.