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 i just passed the exam, for this sim the question was to ensure connectivity to the isp.
i was able to ping the isp after my configuration.
the ip addresses are different in the exam, so make sure u guys understand what ip addresses you route with eigrp, i was looking for the .77 and .60 networks there..
the ip address of the isp though was 192.0.18.6 also i think.
What is the appropriate host you use when doing the configurations during the CCNA exam, is it the terminal of a pc or you can get straight into the router.
Dear Friends,
ACL2,Eigrp,VTP is the sime has been changed in CCNA exam?can anyone let me know??
why is that the network mask is not included in the configuration? any one can help and reply me..thanks a lot
I passed CCNA exam today.Got sim EIGRP,ACL2,VTP as the same in 9tut,but the ip address were diferrent.
Planning CCNP…all the best for all CCNA candidates.
cisco change CCNA in february ???
May be??
Maybe a dumb question. How do I switch routers in the test? What is the command for going from R3 to R1?
Hello 9tuters! I’m just a little bit confused regarding this EIGRP simulation. Do i need to configure the R1 a default network and ip route? Is it a requirement to ping the isp from all the routers. (routers to ISP vise versa)
Because I doubt with the comment above that there must be a full connectivity between them including the isp.
or i’ll just follow the configuration of the simulation above? then i’ll be safe.
Sorry for my bad english.
Thank you.
@mark
could you pls.. post the configuration of the eigrp simulation that you had taken? Is there any additional configuration regarding this EIGRP simulation? Is the scenario about this has changed or not.
You will be praise by the Lord ..
thank you….
@need help
it’s basically the same as this example. in my test though it said that the new router should be able to ping the isp. so i did that after the configs.
before i pinged the isp though i pinged one router (the one to the right). that should work first.
@andrew you cannot switch routers in the test.
@mark
Thanks for that. One last question, do I need to configure a default route if in the real test it will not be shown?
Mark, then how do I go from Router 3 to Router 1 in my commands?
“passive-interface …” command somewhere in R1 configuration. in the above sim 9tut explained abt that…then using which command we will check that 1 is present or not….iam going to write ma xam tomorrow so pls give me a fast rply…..thanks in advance
Do you have a other simulation in you test ?
I just got my CCNA certification and this question was in the exam. The only problem is that there where more than two faults. I did well the two faults that are explained here but I couldnt find the third one in time.
hello at all
for those who took the exam. Did you experience the “error config lock” something like that in eigrp?
Hi Anonymous,
Seems like we encountered the same problem. i took the CCNA exam last janurary 31st and experice a problem with my eigrp.. after i delete the wrong AS, my ENG router does not function at all.. it just hung up, the cursor is just blinking.. good thing i passed the exam..
dumps is still valid with 2 new questions… thanks to 9tut.com.. more power!!!!
Quick question why is that network mask is not included in the configuration?
considering that we hit the no auto-summary??? ?_? why is that the network wild card bits not included in the command?
@Kamote
I also took my exam last January 31, 2012, we encountered the same problem. Good thing, I also passed the exam. And with that “error” I expect that I would fail the exam because my eigrp simulation goes something like that. At the end of the exam, BOOM!! I passed..
I think that is a bug in the eigrp simulation or cisco intentionally put that in exam because those routers wherein that error appeared are not the priority to be answered on the eigrp simulation question.. You must focus on the task of what cisco is requiring on that eigrp sim.
You can only do a show run on those two routers then you can see duplicate networks and two ip addresses on a single interface but you cannot configure them, that’s why.
Hi Anonymous,
Maybe your right, but the router that i have reconfigured was the one with the wrong AS on it, and after deleting that AS the error appeared… Good thing we both passed the exam even we have scored zero in the EIGRP Sim… hehehe Cheeers!!!
how many time in which complete the the labs
the eigrp simulation bug ?????
@Kamote
no kamote we haved scored 100% on the eigrp sim.. ehehehe!! I got 1000/1000. Maybe I think cisco intentionally put that bec. they were not the priority to be answered.
For those who will take the exam soon…. Be careful on the eigrp simulation.
@john
maybe….
@ Trigun
bec wildcard masks are only optional in eigrp
@Trigun
because wildcard masks are only optional in eigrp
Similar question was in CCNA@3 Feb2012, will not able to passed without you 9tut. Thank you
I’ve passed my exams yesterday; ACME 486 and 9tut.com is very helpful links.
hi guys
just wanna ask should i also configure the default route (ip route 0.0.0.0 0.0.0.0 198.0.18.5)
on router 1 also ?? or changing the AS number beside adding the missing route on R1 is enough??
help plz
Can you tell me if we configure the default route in the eigrp simulation
tk
Hi Mohammad, pls i can’t open acme 486q and i have me exam on saturday, can you pls post it to me @ nsikaksolomon@yahoo.com. Many thanks.
why in a trame hdlc,ppp or frame relay , they don’t have a mac address destintion or source ?
Thanks a lot 9tut..i have passed CCNA today with good score…but i have observed..
In Eigrp simulation… passive interface command is enabled at s1/0(connection to ISP) on R1 router…i was faced problem when i entered “no passive-interface s1/0″…
it was shown error at “no passive-interface s1/0″. i think it is the bug in this sim..
^
@Munna, congrats! Pls did u use acme.collisio 486q? I can.t open mine .vce. If yes could u pls forward it to me? @ spyadmin.bonny@nlng.com thanks a million.
Yeah, I took the test today and fell short with an 810, the only notable issue I had was with this lab!
I configured everything correctly and noticed the passive interfaces on R1 (I believe it was called Core Router). However, when I tried to issue the command “R1 (config-router) # no passive-interface fax/x, or sx/x” I received a pop-up box with an ok button that states “no passive-interface is not a command used in this lab”.
Will someone explain this to me? How do I get routers to exchange EIGRP routes if I can’t enable EIGRP interfaces?
Tanx 9tut i dd xam and scred 947
n there is small changes in xam ip address and AS no others are same.. and i got ACL VTP and eigrp..
I just failed my exam :D thanks 9 tut :P
@Josh you can remove the egirp from the router and then put it back in with just the network and no auto summary
@ahsen
Yep, all that went fine. One of the routers is configured with AS 12 or something like that while the others are like AS 212. Additionally some of the routers are not advertising all their attached routes – just like the lab on this page. I got all that, but still could not ping the ISP router.
“Show EIGRP topology” lists a “p” next to every route on the list on R1, which means it is in the passive state and not exchanging routes; right? I tried to enable them and got told by the exam that I couldn’t do that – and if I had, I’m pretty sure I would have passed. I’m seriously PO’d here and am almost to the point of demanding to see the graded test – I think Cisco is padding their profit margin!
In order for this lab to work, passive interfaces need to be disabled on interfaces that need to exchange EIGRP routes, if I can’t control that then I can’t solve the lab, or win – a very convenient position for Cisco to be in, and it’s making me doubt the reputability of Cisco – WTF! And in the time since I have looked up the correct command and discovered that I was 100% right – WTF Cisco? I guess raising the exam price wasn’t enough; they still need to make sure the attrition right is high enough even if they have to kill a few white mice!
Hi
I am studying towards CCNA. I need to get simulations done. How do I get GNS to work ? WHere do I get the IOS Images from. Anyone has latest dumps. Please let me know where to get it.
Tx
Can you tell me if we configure the default route in the eigrp simulation
Just passed my ccna with a score of 920/1000. I finished within 55minutes. Sims were vtp, acl2 and vtp. Many many thanks to 9tut and all.
i noticed in the sim that r1 is the only one that can connect to the ISP, the rest is not. I’m not sure if the objective was met. In actual exam, do you still need to connect the router/workstation to the ISP?
Please somebody can tell me about exam. Must we type on R1 the command :
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
Thanks
Please somebody can tell me about exam. Must we type on R1 the command :
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
Thanks
Please anyone help ?
@ LeRo
Don’t memorize these things – Cisco will change little stuff to try to mix you up anyway. Both times I took the test, the default netwrok was already configured, but that’s not to say they couldn’t change it on your test.
To answer you question, probably not, but you should be ready to just in case!
Okie, Thanks Josh