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)
@Mr. Papagiorgio
First congratulation for your passing, i’m gonig to take my exam tommorow – did you had to remove network 192.168.30.0 from R1 or some other unnecessary networks?
thanks
@sitty
-EIGRP lab changed AS is 12 @router3 and changed one subnet on router1
changed one subnet. did you mean you remove the wrong subnet and then add the correct subnet? or just add?
thanks
@boom
I mean at router 3 have to remove one wrong subnet then add one correct subnet also. addition,at router1 must remove current router eigrp xxx and new add eigrp 12 with command network x.x.x.x.
U clear ?
@sitty
yep. thanx a lot
Hi can any body send me latest dumps of ccna to my mail
tnx for this site, i passed my CCNA…
People keep talking about ” collisio test dump” where can I find these???
Also, everyone on here keeps saying send me the latest dumps so I’m gonna give that ago also as my exam is next Fri,
So if anyone has them please send them to chrismbowen@yahoo.co.uk
Thanks in advance.
@Bow
U can download from this link
http://www.examcollection.com/640-802.html
I passed with dump collisio 486 and Jericho 576
Thanks Sitty
why the wildcard is not needed?does it count as wrong if you insert the network command with wildcard mask?
thanks
all …just became aware of the 9tut blog, wish I knew before taking test which I failed first time around …anyone retake the test and familiar with the labs on the re-take ccna test?
please can anyone tell me if the exam requires some configurations between r1 and the isp i am confuse i am writing my exam on monday
God Bless you all, the creators of the site and you all that have been posting your comments.
i m going for exam today :)
gud luck guys!!
Hi guys i took the test last week and i fail i was so nervous, on the EIGRP simulation was the same the only think was that they put me “pasive interface” y get on this web side after my first test no i know if got the issue i just have to type no passive interface fax/x. i taking the test this week let me know if there is anohter change con the sim
If you retake the test — as I am going to — do they give you a different test?
I agree with everybody else — thanks 9tut
I have taken the Aplus and Network plus tests and they are easy compared to CCNA.
I also passed the test for windows — It was not that hard. Just practiced a lot –
Is the passive interface used with OSPF and RIP? How do you determine if you have a passive interface for the ccna?
@geedub: The passive interface can be used in OSPF, RIP & EIGRP. But you only configure passive interface when the question clearly states that you have to do so. If not, don’t try it in the exam.
I got my ccna yesterday thanks for 9tut may ALLHA bless you .
the eigrp lab did not ask for configuration between R1 and the isp so i am advising people to read the requirement carefully before go on it . Vtp and access-list sim 2 was also there
again thanks for 9tut
Junior Did you pass the test? I’m testing on Friday…
Junior congrats what abt ur ACL sim
today my exam i need some advise about the exam if you can thank you
I must to check the EIGRP AS number on all routers via telnet on all computers connected to the all routers? I must change the configuration of interfaces on routers or hosts?
Those who passed the exam, tell me pleace in detail about all the nuances!
My exam after two or three days…
Thank for participating!!!
P.S.
Not on “all computers” :-)
================================================================
I must to check the EIGRP AS number on all routers via telnet on computers connected to the routers?
and more… :-) I need to add the line “no auto-summary” after end of configuration on R1, right?
R1(config)#router eigrp 212 (or 12)
R1(config-router)#network 192.168.77.0
R1(config-router)#no auto-summary ????????????
Hi,
i going to exam on 10th march and i have prepared only 9tut simulation ac anyone tll me it is sufficient or not.
Sergey, you will have to add the the no auto-summary line at the end of the configuratoin.
If not the summarization will be enable by default.
Dani how did you do?
Hi guy, i take the exam last week and not pass… (801) :(, and i have some questions on my EIGRP i check the AS and fixed on R3, and add the network on R1 BUT i don´t remove the wrong network (i leave it) and also my EIGRP R1 has a passive-interface S1/0 and i don´t remove… that its correct…? Also i need to remove the wrong network on R1…?
The SIM on ACL and VTP were correct… 100%
Please help…!
Sorry also… which software can i use for open .VCE
For check dump collisio 486 and Jericho 576
Thanks
@ Michel: I hope it is enough – I took the exam yesterday and I had exactly the same labs…
@geedub: According to my own experience you will get a different test…
@zombi
try visual certexam
2 Sitty and 2 All!!!!
How we can see that the network is wrong?
When we write command “show running-config”?
This refers to the IP configuration?
From the description of the exam we see 3 interfaces on each router – is the wrong address?
And they should be corrected? I really do not understand …
What else can you see?
R3#show protocols
Global values:
Internet Protocol routing is enabled
FastEthernet0/0 is up, line protocol is up
Internet address is 192.168.77.34/30
FastEthernet0/1 is up, line protocol is up
Internet address is 192.168.60.65/30
FastEthernet1/0 is up, line protocol is up
Internet address is 192.168.60.81/30
@Zombi
================================================================
“I don´t remove the wrong network (i leave it)”
================================================================
How you can determined that it was wrong network?
what is the meaning for addition of network and removal of network pls explain me abou this
pls some one explain me about the addition of network and removal of network in the routers i ma confused about that pls somebody explain about this pls!!!
@Beny and all
I refer to this… the eigrp AS just need the networks that he know… for example on my test R1 has a network wrong, like a issue for connect F0/0 to R3, so I only added the correct network and I didn´t remove the other one…
R1
router eigrp 212
passive-interface s1/0
net 198.0.18.0
net 192.168.36.0
net 192.168.77.0 (I just added this network without remove the wrong)
net 192.168.60.0
net 192.168.35.0 (I didn´t remove this network “WRONG NETWORK”)
So additional to this i can ping any router to this S1/0 of R1 but not to Serial of ISP Router and i can´t obtain pass this SIM…. I don´t understand if to complete this task i need to remove the wrong network on EIGRP of R1
@zombi
first we need to go to r1
router eigrp 212
no network 192.168.36.0
no network 192.168.35.0
and add network 192.168.77.0
no auto aummary
and finally ping the 198.0.18.0 form other routers ..
is this right ??? i dont know actually this is right or wrong somebody suggest me on this!!!
2 Zombi
Yes, u must remove it with command:
R1(config)#router eigrp 212
R1(config-router)#no network 192.168.35.0
Passive DON’T need remove…
passive-interface s1/0 => ISP
2 learner:
192.168.35.0 > Yes, remove
192.168.36.0 > NO, it’s OK…
2 learner
“and finally ping the 198.0.18.0 form other routers”
No… Ping from R3 to other routers… I think…
oh actually this is the concept ah ? removing the network and adding the network..thank you very much benny
oh weed need to ping only from the R3 router ah?
@benny
we need to ping only from R3 routers to other routers ah?
from exam scenario:
“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.”
Yes… ping to R1, R2, R4 from R3 after configuration…
ok, but also… I should ping to ISP (198.0.18.5)…? I think not, because i couldn´t…
I seems that SIM has some issues or debugs because on Serial 1/0 on R1 (Link to ISP) the IP ADD has a subnetmask /24 and some testking put a subnetmask /30 and i tried to changed it but i couldn´t modify this serial…