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::: please concern
my friend also faced the problem that pinging to ISP, the comments regarding this matter
the guy
czona
February 22nd, 2012
Solution no.2.:
is working… so is it possible to apply this in exam…. please reply for this (ADMIN )
aslam o alikum Thanks God i passed exam with 972 marks labs were vtp , eigrp and access list 2 and in eigrp topology was same but different ip address and router names were different there was alos showing passive interface between Router 1 and ISP, but i not apply no passive interface command and passed it
@dj: In the exam, you don’t need to ping to the ISP. Just make sure you can ping all routers (R1, R2, R3, R4) from a specific router and you will get 100% for this lab.
exam is easy…. if question asks to ping either ISP router or any other router, dont get panic… its not a big deal…. just stay focus with EIGRP …. everything will work fine …. ppl who report abt some commands not working, i doubt if they typed the command properly … this website is really helpful for learning purpose …. dont just learn the answers but try to get the concept …… if you dont find any explanation here visit cisco documentation … Good Luck!!!
can anyone confirm, that he got 100% to this LAB while typing
permit ip any any
instand of..
permit ip any host ?
i will take my exam in 3h – please !
@9tut::
I’m a very good follower of 9tut. so tomorrow i’m going to sit for my CCNA. i have few questions from you 9tut ADMIN… please concern…
1) one of my friend got 4 labs yesterday.. telling that NAT sim included with EIGRP applied do you heard abt this matter any one from world
2)Is CISCO changed their pattern or pool???
but CISCO change their payment policy and we have to pay the payment before 24 hrs.
please SIR kind enough to reply for this matters. I humbly requesting from you…
passed 960/1000
EIGRP, VTP, ACL-2
8 – 10 q i didn’t face on collisio..
i have not configured NAT on EIGRP to ping the ISP-Router.. Because the task is to tshoot the connectivity in the core ..
I’ve learned:
* 9tut – Labs
* Collisio
i’ve used permit ip any any on ACL..
god bless 9tut and good luck to y’all!
@Jinys from Finnland
Could you please write here some new questions? Thanks a lot! :))
@heida
something about chap authentification
something like “how mutch ports musst be configured with “ip nat inside” the topology looked similar to the eigrp.. the answer i choose was “3″
there was a access-list in wrong order you have to choose the correct order
a new drag&drop but i can’t remeber (it was a easy basic question)
for now i cant remember more..
Just pass with 933/1000 lab vtp,acl2,eigrp same as this
By the Grace of Allah today i have passed CCNA for 986/1000 . thumbs up for jericho collisio and specially 9tut.
New question was added
—–>whether ip nat inside applied on each sub interface of router connected to the lan or on the main interface.
——>some people are spreading rumour that “in the EIGRP Lab Central router and all other router are not connected to the ISP router and the solution will be to use NAT to connect the EIGRP routers to ISP ”
NOOO000. i also had EIGRP LAB and central router and all other routers of EIGRP 212 were not connecting the ISP but they said in the Question that All other routers are connecting the ISP. then i just concentrated on the EIGRP not on the connection of EIGRP routers to ISP..and Never Ever use NAT in the EIGRP LAB just focus on the EIGRP configuration as discussed in the 9tut.
i passed CCNA exam today with 100% … in Eigrp i was stuck bcoz they ask to configure all routers so they can access internet and complete configuration of newly added router.. i try to configure Nat as was suggest by “czona” but was got error command unrecognized or some thing like that.. so i spend alot time on this lab n leave the lab with only AS xx routers conectivity.. at the end i got 100% :) so it means u not need to ping to ISP its FYI …
Passed with 920. Eigrp, VTP, ACL2 Labs. couple of questions insert the source ip source mac destination ip source ip, IPv6 questions which address is link local, overall advice is to study the colliso 420 and do the eigrp, acl2 lab. Do not make the labs complicated, understand what they are asking you to do and do it…nothing else. They dont want you to configure NAT in the EIGRP lab. You should be able to finish the labs with about 8 commands. I see many people on this thread who have knowledge outside CCNA scope and that is great, but keep this one simple and you will pass.
oh btw thanks to 9tut great lab preparation, helped out tremendously
Guys even if they are asking to ping ISP gateway IP from all the routers, we have a pretty good solution for that. I am pasting the configuration of R1 router, just configure your R1 according to the text and you can ping ISP IP from all the routers…
R1#sh run
Building configuration…
Current configuration : 1127 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R1
!
enable password cisco
!
interface FastEthernet0/0
ip address 192.168.77.33 255.255.255.252
ip nat inside
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0
ip address 192.168.36.13 255.255.255.252
ip nat inside
clock rate 500000
!
interface Serial0/1
ip address 192.168.60.25 255.255.255.252
ip nat inside
clock rate 500000
!
interface Serial1/0
ip address 198.0.18.6 255.255.255.252
ip nat outside
clock rate 500000
!
router eigrp 212
network 192.168.36.0
network 192.168.60.0
network 198.0.18.0
network 192.168.77.0
no auto-summary
!
ip nat inside source list 101 interface Serial1/0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Serial1/0
!
access-list 101 permit ip 192.168.77.0 0.0.0.255 any
access-list 101 permit ip 192.168.60.0 0.0.0.255 any
access-list 101 permit ip 192.168.36.0 0.0.0.255 any
!
line con 0
line vty 0 4
login
!
end
I, myself, am going to attempt the exam tomorrow, wish me luck ;)
All the best Waqas Maqbool – I need the luck too, I’ll also be attempting it tomorrow.
Good Job Waqas Maqbool !!!!
I passed today with 973 marks!! Thank u 9tut so much …. it was great help reading all ur dumps…. I had the simulation question of EIGRP with 4 routers and the ISP. First things first… there is no need of sending a ping to the ISP. Secondly.. all you need to do is configure eigrp As number on one router, and rectify network advertisement on other router. That’s it. No need of pings to ISP and default networks or anything …. Its quite easy guys!! ;)
why change the AS number??? this is EIGRP not OSPF! EIGRP can have different AS numbers and still work OSPF can not so i could see why you would have to change it on OSPF but don’t understand why with EIGRP?
nevermind i was thinking about the process ID
i am not sure… but if u give static route from ISP to R1, we will be able to ping from all the routers to ISP….
ip route 0.0.0.0 0.0.0.0 198.0.18.6… as u cant use eigrp on ISP,so we have to use static route….
hello guys hope evry body is fine i will take my ccna exam 28 feb.
Tell me about new information for sit in exam.
Can anyone give me the latest dump and explain to me the problem in eigrp the ping from others routers to the isp . Is cisco ask for that or not ? Please i am confuse
i did not understand this part:
Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router
:(
@dj:
1) I never heard the NAT sim included with EIGRP sim. They are 2 separate sims.
2) Not yet, as I know
Best wishes in your exam!
i understand now ^_^
but i have question
the router cannot ping the isp ?
AD
can you tallied us what in the exam today i have exam today
thank you
creem.cramel@yahoo.com
Just passed! 920 – thanks 9tut labs – EIGRP and acl’s
@nak. did your EIGRP lab include pinging the ISP?
The “show mac address-table” is functioning command in the real exam? Please tell me someone! I have an exam next week.
Yes sh mac address-table is functioning command. You will need it in addition to other commands like sh cdp neighbors to answer questions about a network setup.
@warley, you don’t have to worry about the ISP connection. Read the question. Try to understand the situtaion and focus.
By the way I use
“show ip eigrp neighbor” command in the exam to make sure neighbor relatioship as well as ping and show ip route new added router.
QUESTION!!!! Do i need to remove the 198.0.18.6 advertised in Central Router??
please reply. taking my Exam tomorrow :(
guy can some one please tell me the new questions that are not being found on collisions 480 please
I have to thanks 9tut. I barely passed the CCNA because last night I practiced the VTP, ACL2, and EIGRP sims. Otherwise, I’d have failed the exam. I did not study from 9tut at all. But, yesterday I remembered that someone told me about the page and I gave it a chance. It saved me. :) The sims (VTP, ACL2, EIGRP) are valids!!
The only issue in the exam is that I couldn’t issue “ex” as exit to go back to the privileged EXEC mode from the global configuration mode.
Couple of questions on the eigrp simulation and the packet tracer practice file provided:
it states the fix as:
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
Question 1 is: considering there are other networks in the diagram with the same prefix of
192.168.60.x and 192.168.77.x wouldn’t that mean that the wildcard mask is needed in the network statements that you add??
Question 2: on the new router you are adding, the show run command in the packet tracer file provided shows all of the masks on the interfaces as 252, but the chart(show run) in the question above shows the masks as 252, 240, 240.
Could someone give me some feedback on this so I am practicing the right thing. Thanks!!
To clarify my question above, my thinking is that if you have multiple networks in the topology in the question that are subnetted as they are, and you input network statements without the wildcard mask the defines the subnet, then won’t that cause havoc since the routes are common? SO if my network is 255.255.255.252 shouldnt I be using 0.0.0.3 to define it??
should have said my mask is 255……..
Dear 9tut today i have passed my CCNA exam, and i’d like to say thank you very much for all the information you sharing you are the Best!!! :)
By the way the EIGRP Simlet was slightly changed, now it contains 6 routers with a bit different configuration. The questions remain the same more or less.
Hello guys
when we configure the router do we have to click on router and configure it or the host connected to it as in the above instructions it says use appropriate host.
the ip access-group 100 out is really workinga? it just displayed me like this only”ip access-expression 100 out”
All, I just passed exam today with 933.I would like say so thanks 9tut to share all thing also dump from Collsio 486,Jiricho 576 its correct same real exam just changed sequence of choice.
Lab same 9tut just changed as such
-EIGRP lab changed AS is 12 @router3 and changed one subnet on router1
-VTP lab just 5 questions my exam got SW-AC3 as root bridge
-ACL2 lab with HostA permit web finance server,all other deny access to finance server,all from lan and internet can access to public web server
i passed the exam today with 947,, tq you so much 9tut,, i got 3 lab : acl,this lab(eigrp), and switching,,,
@Kanchan
In real exam will configure via Host as it can’t click on router when you will access direct to router.
@eq did R3 ping the ISP? can you post me the config
@sitty were u able to ping the isp’s ip from all the routers??
Passed CCNA today Feb 29 with 960. Finished the test in 30 minutes and studied using collisio test dump. Lab sims were ACL2, VTP, EIGRP. Sims and collisio test dumps still 100% accurate. Good luck!
@dude
I unable ping to ISP for router so it correct for EIGRP lab as exam require just can ping btw router only.
@dude
^
^
See my answer above this.
Quit worrying about pinging the ISP router. You do NOT have to ping the ISP router on the exam. I just passed today with 980. Had EIGRP, ACL2, and VTP. Make the changes on R3 and as soon as you add the network on R1 a new adjacency will occur. Tab did not work, shortened commands do work (sh run, conf t, etc). Colliso is still valid. show mac address-table worked.