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)
@9tut any update on the new eigrp lab? I will write my exam on 7th July 2011 please help. Thank you.
Please send me the new EIGRP lab too on fkansari82@yahoo.com, exam is tomorrow…Thanks in advance.
@CCNA_learner, @ciscowill: Please read the “Modifications” section above to understand some changes in this sim.
Hi , THX a lot – for this great site
I/m trying to manage the point :
“allow hosts to use the internet”
how to do this , ad finally how to test it ?
I’m trying to ping from routers R1 and R3 to ISP serial 198.0.18.6
i get the response from R1 , from R3 – none
so my Question is : what else should be done if there will be a statement “allow hosts to use the internet” ?
THX for help , i’ll try to pass 30 VI morning , hope that answer would be earlier
best regards
Andy
MISTAKE – ISP Serial 198.0.18.5 !!!!!
OK , it seems that i’m talking to myself :-))
everything goęs fine if i add on ISP default route to R3 (or eventually add info about LANs connected through R1 from R2,R3,R4 )
how do you know that router eigrp has to be 212 From 22? Thanks for the help.
@ Cruz : it will be mentioned in the question, what AS no: is running on all the router .. u gotta check the AS no: for the newly installed router by using ” show running-config ” ..
hi 9tut, i did send the photos by mail, thanks ¡¡¡
Hi all. I’m new to this site, so please forgive me if I ask a dumb question :) I’ve done the sim and removed the eigrp 22 AS # from the config…I’ve added back router eigrp 212 & the network statements 192.168.60.0 and network 192.168.77.0 — then i added the no auto-summary command. After I enter the no auto-summary command, I’m not able to see ANY eigrp routes. I’ve checked for passive interfaces, but do not see any. I’ve looked at the correct answers above, and my config seems to match. Is there something that I’m missing??? Thanks in advance!
Just passed the test. SIMS were EIGRP, VTP, ACL2, all exactly as found on here. Thanks!!!
“?” and “Tab” works on the exam simulator. Same exam concept different IP address and AS number, though. Exam is very easy if you study hard. Good luck to all!
Hi , THX a lot – for this great site
I/m trying to manage the point :
“allow hosts to use the internet”
how to do this , ad finally how to test it ?
I’m trying to ping from routers R1 and R3 to ISP serial 198.0.18.6
i get the response from R1 , from R3 – none
so my Question is : what else should be done if there will be a statement “allow hosts to use the internet” ?
THX for help , i’ll try to pass 30 VI morning , hope that answer would be earlier
best regards
Andy
~~ Don’t worry about it, as long as you can ping from each router to the other routers Fa0/0 or fa0/1 you’re good to go.
in addition, You will notice the static route from R1 to ISP has been distributed to all other routers as soon as you have the EIGRP converged.
> there’s no passive-interface at all.. Believe on 9tuts example that’s all you need to do.
P.S. Thank you very much again 9tut, See yah on the CCNP R&S. :D
9tut: Just confirm me if we find passive interface b/w R1 and ISP, what should we do?
Should we leave it as it is? Or are we required to insert some commands to remove it?
9tut: Just confirm me if we find passive interface b/w R1 and ISP, what should we do?
Should we leave it as it is? Or are we required to insert some commands to remove it?
Best Regards
@Atif: If you find passive interface b/w R1 and ISP just leave it there.
Best wishes in your exam!
@9tut:
I’m new to this site, so please forgive me if I ask a dumb question :) I’ve done the sim and removed the eigrp 22 AS # from the config…I’ve added back router eigrp 212 & the network statements 192.168.60.0 and network 192.168.77.0 — then i added the no auto-summary command. After I enter the no auto-summary command, I’m not able to see ANY eigrp routes. I’ve checked for passive interfaces, but do not see any. I’ve looked at the correct answers above, and my config seems to match. Is there something that I’m missing??? Thanks in advance!
@sjonesy8: If you didn’t see any EIGRP routes then maybe you entered wrong EIGRP AS number (not 212 in your exam). Please notice that in the real exam the AS number might be different.
@sjonesy8 more than likely you didnt add 77.0 route to R1 under eigrp 212
I am going to appear tomorrow for certification. Wish me luck please. I have prepared through CBT Nuggets, ACME and MASHTI. Sims I worked at are EIGRP, ACL and VTP. Any suggestions for me?
thanks blah blah…that was exactly it!
Thanx 9tut. I cleared on 30th June with 947 marks. Nearly 15 questions were out of ACME and MASHTI. All SIMS (VTP, EIGRP and ACL) were from 9tut. You people need to have good concepts to clear it on your own. Concentrate on Frame Relay and Security. Best of luck.
@ atif pls what was d question on ur eigrp sim provide solution also .tanks
@9tut
hello i have a doubt that in the exam in the simulation question once if we enter the router’s CLI then if we have some doubt on the diagram can we get back to diagram and verify and then enter the routers CLI again.. please help
@dinesh: Yes, you can!
@9tut how do u get r2,r3,r4 to reach d ISP bcos the current sim asks for that. pls reply.tankx
hi atif u have just pass your exam congrats!!!! help me can u send me what the 3 sim that have given in the exam???plz plz
I dont think i lacking experience or knowledge.
I know that because this s and i sim came up and i had to skip it because i could not finish it. even though i knew this material inside out.
I have realized that my main problem right now is fear and nerves. I get very scared and sweaty.
do not ask me why because i am trying to figured it out my self
I will give it another try later so see what happen.
Hi,
what is the exact answer if I have to give access to the PC to internet ?
and where do I have to insert the default-information originate, seems that eigrp doesn’t support this command!
thanks for your help
hi,
in eigrp configuration answer is that correct to supply only full class C network like this:
R3(config)#router eigrp 212
R3(config-router)#network 192.168.60.0
R3(config-router)#network 192.168.77.0
since it’s some of interface only has /30 mask, do we don’t need to specify wildcard mask like:
R3(config)#router eigrp 212
R3(config-router)#network 192.168.64 0.0.0.3
R3(config-router)#network 192.168.77.32 0.0.0.3
Hi all, took my exam yesterday July 7th and passed with 933 in 50 minutes. Thank you 9tut for the amazing site and assistance you provide. Sims were VTP, EIGRP and ACL2. In ACL sim requirements were
1. allow host A web access to finance server
2. do not allow host A any other access to finance server
3. do not allow any other host to access the finance server in any way
4. allow all host access to the public web server.
EIGRP sim was same except AS was 2 and router2 was configured for 22. Added route to router1 after adjusting AS on router2. Passive interface was only between router1 and ISP.
I primarily used 9tut to prepare but also used acme 356q and TK 218 new version. Thank you again 9tut, it feels so great to finally be a CCNA! Next stop CCNP!
I got the same test as ciscowill , but again my nerves killed me.
i am taking test tomorrow :) fingers crossed!!
hi everyone! i passed today, scored 92.0 :))) questions are stil the same, acme i tk_v218, sims also!!good luck everyone!!
I did my exam today and passed with 947/1000. My sims were EIGRP, ACL2 & VTP. Almost all questions were from Acme.356q (examcollection.com) and ali zain dumps (New&Recent questions: 400 to 602. link is https://rapidshare.com/files/2071410335/640-802.vce ). Thanks to God (for grace and strength), 9tut.com (Simulations),Todd Lamle (Sybex CCNA BOOK), Jeremy (CBT nuggets) and also to my MAN Chika (For all the encouragements and advice).
Go for it guys, u can do it just put in as much effort as u can.
i have a question, are we suppossed to be able to ping isp 198.0.18.5 from the routers and /or the pcs?
I check the interfaces and under eigrp 222 in the simmulation from this website and
dont see any passive interfaces configured, i make all the necessary changes and
are able to get updates between r3 and r1, however i am not able to ping the isp router
even after placing the command redistribute static on r1. can someone help?
What IPs do I need to ping?
Why is it that the network address is 192.168.77.0 and not 192.168.77.32, when it was stated that the subnet mask for this is 255.255.255.252? Is it connected to EIGRP’s auto-summary?
pls any tell me which simulation will come going to take today.
DLO
create a static route btn the ISP and R1 router.
Is R3 only concerned with R1′s networks? The networks added do not included R2′s S0/0. Thanks
In this sim ping to ISP is not working from R3
@ all , i don’t think a ping to the ISP is part of the task remember the link b/w R1 and ISP is a public IP but others are private ip so the ISP wont allow them.just type in ” default-information orginate or redistribute static” it will redistribute the static route b/w r1 and ISP to the other routers . bur the problem is this if u want the other routers to communicate to the ISP then create at static route @ ISP but u wont b given access to the ISP in the exam bcos the exam alredy exlpains that all internet connectivity is working correctly.so i think the task is b/w R1 and R3 then redistribute static route to all routers thats it. pls correct me if am wrong
@all: I updated this page with explanation about the “default-information originate” (in fact it is “ip default-network”).
i pass my cisco ccna exam today.THANKS GOD. but i m not so happy.just PASS(grade)
the same lab : eigrp,vtp and acl. i got a trouble in eigrp lab.
there was a passive-interface on s1/0 R1 interface; neither ‘ ip route’ nor ‘default-information originate’ worked.
@obione.what is the exact command for redistribute static and where to give this. is this a part of exam
@ smith, pls what was ur task in the exam.
@9tut,
from the attached cisco link these two commands will redistribute the static route to the ISP to other routers but a ping to the ISP won’t still go through 4rm other routers .getting other routers to reach the ISP is that part of the task bcos it seems not to work?.
!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
@ 9tut, pls configuring NAT on the border router allows the other routers to reach the ISP .Can it be used as a solution in the exam.bcos i think the reason the other routers are not able to reach the ISP is bcos they have private IP addresses.tried it and it work but i dont know if it can be used in the exam