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)
no didnt give default network r1 ???
i write the same commands here
eigrp
I completed ccna last week. I did exactly like in this example answer. but adj. did no occured. I don’t know why. :(
what xx ????
u apply the exam ??
@ Saaf
check run config first… find the different AS. change that to 212 (the one with eigrp 22) then add the netwrok. make sure you no auto-summary
@pranshu: Please use version 5.3.3 or above to open it.
i make all of them
i take 40%
why ???
in eigrp router 1 need passive ??????
or no ???
tommorrow exam can any body tell me about the exams and labs ?
hi guys question if i dont put the command copy runing-config startup-config at the end of the eigrp lab what will be the problem? is there a conflict to my configuration tanx
????? how should the save ??
Does anyone out there have Packet Tracer 6 or later? Please send to aaegh7@gmail.com. My version (V5) does not support iBGP…I’m preparing for CCIE.
Thanks in advance.
@saaf maybe what you did is you do what exactly the above code and change only AS and the IP that is given in the exam. There’s a modification comment above regarding passive interface from R1 to R3 to R2 and R4. you will see that passive interface when you do show running-config on all local router if you see this then remove it.
@9tut
I just want to connect All routers with ISP…..Applying configuration U provided on R1
BUT on R1
!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
THIS IS NOT WORKING!!
HELP @9tut
@9tut
In above file i.e EIGRP_SIM_ANSWERED,u applied default route on ISP router,not on R1.
And i applied default network command as well as default route on R1[as guided by u"A static route from R1 to ISP & “ip default-network” command in R1 are the correct answers."]
BUT ITS NOT WORKING!!HELP
@9tut
In exam v need 2 provide Connectivity 2 ISP from R1
and need 2 give ip route and ip default-network command on R1
I did,in practice.
BUT ITS NOT WORKING
PLS HELP>>NEED 2 provide connectivity 2 ISP by applying Commands on R1
@pranshu
i dont write passive commands on r1 !!!!!1
ham
only change as ????
i take the same questions above and write the same commands but i take 40& why ??
Hi folks, took the exam today and failed. Actually got confused with the Eigrp sim because I was unable to ping the serial interfaces on the adjacent router.
The running config on the adjacent router showed that the serial interfaces, 3 of them had the shutdown configure, don’t know if this could have been the problem. Tried doing the no shutdown command but the sim rejected it, with the message; shutdown not accepted.
Guys, do anyone has an idea what could have been the issue?
Note: the was the usual vtp and acl sims, some drag and drops, and couple of ospf questions.
Thanks guys.
Rosche
how this ???
@ saaf did you do show running-config on all local routers.
when you see this in any router as you execute router#show running-config
router eigrp 212
passive-interface FastEthernet0/0
passive-interface Serial1/0
network 192.168.36.0
network 192.168.60.0
network 198.0.18.0
network 192.168.77.0
no auto-summary
then you should remove passive interface fa0/0 which is the connection in R3
i cleared my CCNA today with 933/1000…….got sims of VTP, ACL & EIGRP…..thanks a ton to 9tut for helping….your help is greatly appreciated !!
@Gaurav, congrats. Please, I need your help, can you show us how you wrote your commands for EIGRP sim, I really got confuse when I took the exam. I had the serial interfaces on R1 shutdown and I got confuse on what to do. My pings did not work.
Can you help or anyone, 9tut can you help, just write out the commands for us?
Do we have to configure any ip route?
@9tut…help pls
Hi, I downloaded this sim to practice but packet tracer gives me an error saying the file is not compatible with this version of packet tracer. Can someone help please.
@Rosche: Are you sure that the serial interface on R1 was shutdown? Please notice that R1 has many serial interfaces. In fact in this sim they don’t require us to ping to R1. They just require:
“The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.”
So we don’t need to the ISP router.
@Pranshu: Please try it on GNS3, Packet Tracer sometimes does not act like real routers.
@Pranshu: Also the configuration for R1 is:
interface Serial1/0
description Link to ISP
ip address 198.0.18.6 255.255.255.252
clock rate 500000
!
router eigrp 212
passive-interface s1/0
network 192.168.36.0
network 192.168.60.0
network 198.0.18.0
network 192.168.77.0 0.0.0.255
no auto-summary
!
ip classless
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
@9tut :
network 192.168.77.0 0.0.0.255,
is it right..???
i think we remove it & give only
network 192.168.77.0
am i right or wrong…..
@9tut:
Yes the serial interfaces on R1 were shutdown. Thought it was the same as passive but apparently, it was not. Try using; no shutdown, but the system reject it.
Is it strange that they had shutdown in the command?
Any possible solutions to these shutdown interfaces?
Thanks
Passed CCNA exam yesterday. This lab, ACL and VTP. If does not work you´ve probably to check the Hello times ;)
I failed the exam because of this simulation…. I didn’t know about the passive-interface command, and the routers didn’t wanted to set up neighbour relationship… so I have lost about 40 min on that sim and wasn’t able to detect that…. so I have run out of a time and didn’t answered to 7 questions… but had 711 points…. so this thing is very important ! It was expensive lesion for me, don’t let that be for you too! :D
(btw: I had total of 120 min for my exam because the oficial language in my country is not English)
One very stupid thing in the exam is that you can not mark questions for later review and you can not go back to any of previous questions!
I too have issues with downloaded packet tracer files to practice. Its not compatible with the packet trace version I have. Can somebody help with or mail compatible version ?
Today i passed my exam & i score 960/1000,
Thanks to 9 tut for sim practice, but there is bug in exam that they asked in VTP to
“From which switch did Sw-Ac3 receive VLAN information ?”
i give command “show vtp status” but there is no ip address from which it modified & also sw-ac3 is client, therefore i give approx ans which i see here bcoz there is no option for me to give ans, & also a bug is there is not working “show mac-address-table” command when i give shortcut of “show mac” then it show mac table
Sim is ACL2, Eigrp & VTP, paper is very easy, i complete my paper in 1 hrs. therefore don’t be hurry in exam bcoz once u go to next Q. u don’t come back, therefore understand the Q. & then give confirm ans.
ACL2 :
allow host B to financial web server to access web browser
other services are deny to lan, core & also host B
to other permit all
EIGRP :
Configuration same as Here only IP address & Router name different.
Thank to 9tut, god bless u, u doing nice work to helping us.
the modifications is valid. there is a passive interface s1/0 on Hub (R1) to ISP router. And it can’t be removed. And you can’t not insert default information-originate also.
But from R3 (Servers) router, i still can’t ping ISP interface even i ping it from R1 (Hub) router, the result is Request timed out.
I don’t know this is right or wrong, i skip it.
But fortunatelly i passed CCNA with score 894.
thx 9tut
Hi guys can anyone tell me who has just done his exam if there is any questions changed? were is any question about ipv6 ?
thank you
With which version of packet tracer these SIM files open? I tried with 5.3.0 and 5.3.2. With both versions files doesnt work. please help.
@Testtaker tim – You need Packet Tracer 5.3.3. You can get it from here: http://www.packettracer.info/packet-tracer-version-5-3-3-software-downloads.html
Yesterday i clear my exam with 960/1000 marks in just 1 hrs, paper is vary easy.
Sim is VTP, EIGRP & ACL2
EIGRP & ACL sim also easy,
In EIGRP there is no passive-interface between R1 to R2, R3 or R4, therefore no need to remove it, only the passive-interface is in between R1 & ISP but we don’t need to remove it, the AS no. is 221 & other configuration is same as shown here, I right here Router name R1, R2, R3 & R4 only just for ur understanding bcoz there is router name & IP addresses are different, but configuration is same.
In ACL they said
Host B should be able to use a web browser(HTTP)to access the Finance Web Server
Other types of access from host B to the Finance Web Server should be blocked
All access from hosts in the Core or local LAN to the Finance Web Server should be blocked
All hosts in the Core and local LAN should be able to access the Public Web Server
But there is much bugs in VTP :
First i tell u which Q. comes in it,
Q.1 What interface did Sw-AC3 associate with source MAC address 0010.5a0c.ffba ?
Bug : There is “Show mac-address-table” command not working therefore i used shortcut of it “show mac” & then it show me mac address but there is Fa 0/12 interface associate with it.
Q.2 Which switch is the root bridge for VLAN 1?
Ans : Ans same as here
Q.3 From which switch did Sw-Ac3 receive VLAN information ?
Bug : I used “show vtp status” command, the mode of switch is client but there is no IP address shown from which it take VLAN information therefore i have no idea what can i do, therefore i give approx ans which i seen here, i don’t know it is right or wrong in there.
Q.4 Refer to the exibit, SwX was taken out of the production network for maintenance. It will be reconnected to the Fa 0/16 port of Sw-Ac3. What happens to the network when it is reconnected and a trunk exists between the two switches?
Ans : Here is vary big twist bcoz ans is same but they right there in different form, they say that All existing switches will have only students, admin, faculty VLANs. There is no option of “The VLANs Servers, Management, Production and no-where will be removed from existing switches”
Q.5 Out of which ports will a frame be forwarded that has source mac-address 0010.5a0c.fd86 and destination mac-address 000a.8a47.e612? (Choose three)?
Ans : Same as here shown.
I think it help u guys, best of luck to all, i share it bcoz happiness is increase when it share.
When u also give exam then it share may that help anyone.
From bottom of my heart thank you vary much 9tut, u guys doing vary nice job to helping us, god may bless you…….
@Adi thank you. Its working fine now
Question to the rest. Shouldn’t we remove the 198.0.18.0 network from the eigrp configuration? It is not part of the autonomous system and a default route is configured to it. Why include it in the R1 configuration? Please explain. Thanks again
@john: the problem is that the network 198.0.18.0 should be advertised in router eigrp 212 (in the exam there are two static routes, that’s not good) but yes, unfortunately it doesn’t let you to modify the interfaces on R1 nor the default route :( [doesn't metter by the way because if all the routes are working properly and the only problem is that you cannot access the ISP they still give you approx 70% of the max points] so keep in mind that eventhough the exercise indicates that everbody is able to access the ISP it’s not true because of the wrong routing table on R1.
Could anyone elaborate on exactly where and how to remove with the “passive-interface …” between R1 to R2 (or R3, r4) routers when required?
@Eoin: it’s not needed to remove passive interface between the ISP and the main router.
Ok, so just to be sure. are you telling ignore the the suggested modifications of this simulation
thanks 9tut…i got eigrp…vtp….acl….
Passed CCNA today with 960!
EIGRP, VTP (first 5 questions) and ACL2 sims.
Watch out what you are asked! There will be some variations.
http://www.examcollection.com/cisco/Cisco.ActualTests.640-802.v2013-01-28.by.Spike.662q.vce.file.html
http://www.examcollection.com/cisco/Cisco.ActualTests.640-802.v2012-12-18.by.Acme.676q.vce.file.html
and
http://www.examcollection.com/cisco/Cisco.PrepKing.640-802.v2012-08-03.by.Brar.631q.vce.file.html
100% valid.
Thanks a lot to 9tut!
passed CCNA Exam today 907¡¡¡ im very happy thanks a lot…9 tut…
I got the passive interface configured between R1 and R4 but couldnt remove it, tried no passive-interface s0/1 but got an error message, pointing to S0/1. I eventually removed EIGRP on R1 and reconfigured. whats is the correct sysntex to remove passive interface? this killed my time!Pls help.
@PD
I think you didnt entered to the current configured eigrp
lets say EIGRP 212
>router eigrp 212
>no passive-interface serial 0/1
Cleard CCNA 973/1000 .All question frm 9tut n Shekhar. Sim(Acl 2,Eigrp, Vtp)…Thanks a lot 9tut…