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)
Passed the CCNA certificate. Thanks to 9tut. This Lab was in the test, the only thing that changes is the IP addresses
Yes all of them, you don’t know. Which ones you will find in the test
Passed CCNA, Thanks to 9 tuts
All are based on Spike and Shekar. My region is Southern India;
All questions are same but make sure that you practice the dumps before exams.
Cheers!
It is necessary to insert the command ” no passive-interface ” on the link between R1 and R2 ( R3, or R4 ) ? Please help
this sim on CCNA exam today. There was a bug. Clicking Router did nothing, clicking host next to router brought up CLI for router….i was freaking out fr 5 minutes (wasted) before I figured it out.
I can’t open the sim practice Packet Tracer with the 5.3 version. Do anyone can open it ? I had already try with the 4.0 and 5.3 version.
I got his question on the exam today.but there was more than 1 router with out the correct EIGRP automous number..did have much time to check my solution,,access list lab took up most of my time
thanks to 9tut,i have passed my ccna with 894 score,EIGRP,VTP,ACL2,was my simulation question…., all the best for those go going to take ccna exam
El 7amdulellah i passed CCNA by 920/1000
thanx to Allah
thanx 9tut,, Spark..
Hi therethansk for the blank muodle its good.I’ve been searching around to find out how to add my admin muodle to an already existent tab, under the system->configuration menus . rather than having it as a loan muodle at the top on that hoz menu.do you guys have any information on this?many thanksbtw, v nice design on this site
spike dumps + 9tut acl2,eigrp, vtp sims.passed today 933/1000
got eigrp, access list sims for me and questions frm 9tut…passed wid 933
In EIGRP sim, its showing P Passive interface but i just configured the eigrp AS properly and the network is fully connected….so, no need to worry for passive interface command in INDIA…if ur writin outside india, then u may need to disable it.
passed: 933/1000 – got eigrp, acl2 and vtp sims. thanks to 9tut and those contributed by posting here as well as the certguide Sekhar
goodluck to those taking the exam
If anyone can send me dumps I would appreciate it. eshimonski@gmail.com
Thanks!!
907/1000 Thanks 9tut the lab change the number is 22 in R3 and should change to 23 remove network in R1 .74 and add other network. :D
Thank you guys .. my exam is on 30 june
wish me luck
Where in the command line do we remove “passive-interface” and what is the syntax?
Hi Guys?
The fact the interface s1/0 is configured with passive-interface command should not affect the functionality either it is configured or not, right?
What do you think?
Thank you!
Jay, here you have a link about it:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0a.shtml
JBS
What version of Packet tracer is this sim compatible with? I also can open it with ver 5.3.2xx
Please help
i cannot open the eirgp packet tracer with 5.3 or 5.1 anyone know what version it is?
bonjour si le même examen passé le 27/06/2013 merci 9tut
HEY GUYS! HOW CAN I USED EIGRP LAB HERE?? WHEN I OPEN IT IN MY PORTABLE PACKET TRACER IT SAID THAT THE FILE IS INVALID!!!!! PLS HELP!!!!!!!!!!!!!!!!!!!!!!!!
@jiggiegene SAME PROBLEM HERE!!!!!!!!!!!!!!!!!!
here is fully working cracked version of visual Cert exam manager.you wont get any annoying messages like trial copy with this.this is excellent.regards
http://reliablefiles.com/file/0Ret7
http://reliablefiles.com/file/0Ret8
cisco has create alots
I failed exam today. For eigrp there were 5 routers with one connecting to isp. on the other 4 routers one had wrong eigrp group which I corrected but on 5th router that connects to isp there was no eigrp statement in running config, but in one of the s/0/2/0 interfaces there was a statement like this (not exact ip’s but you get the idea)
192.168.77.33
192.168.6.0
192.168.77.33
198.0.18.6
198.2.16.0
no auto-summary
I tried to go into the interface but it wouldn’t let me. so am i supposed to add the entire statement in the running config and not worry about the entry in the interface that i couldn’t get into anyways. I don’t see where anyone else ran into this during the test. I only see where testers had to correct the eigrp group or maybe add an add’l network or take one away.
responses appreciated
are you allowed to add the command “no ip domain-lookup” before configuring routers in exam to avoid waiting 5 minutes for a mistyped command?
@tester Are you saying that when you clicked the router, nothing happened and you couldnt get to the CLI? If so, that is what happened to me and I finally figured out that clicking the host that was connected to the router brought up the router’s CLI….crazy!
download cisco packet tracer 5.3.3.this eigrp lab will work in new version of packet tracer.
link http://www.mediafire.com/download/nqdoh5b84naw69y/PacketTracer533_setup_no_tutorials.exe
Please update the simulation with the latest packet tracer
cz it is not working with the old one
Passed on Friday 31 June 2013, all question from 9tut.com and also Shekhar dump.
@witz73 – no I didn’t have any problem clicking on the router and getting in. there was no eigrp statement in the router that connects to the isp router so i’m guessing i need to add the entire statement next time. just thought it was weird that no one else had that issue in their lab
Hello..
I worked with the above SIM, but I dont get the result..ping is not working.
I also downloaded the answer sim from here, bot thats also no working..
could u pls anyone help me
please anyone check EIGRP SIM in 9tut.
Its not working to me, even the answer simulator of EIGRP that I downloaded from 9tut.
Please do help….
I can’t ping the from router 3 to the other router’s IP’s and I can’t ping to router 3 from the other routers. I should be able to do that after correcting the eigrp statement on router 3 correct?
oh i figured it out, added the additional network statement and can now ping all of the networks from all of the routers.
question though – in the exam I know you say in your eigrp tutorial that we’ll see this statement in router 1 (different ip’s of course):
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
but if it’s not there should we add it? I ask because it’s not in your sim on router 1 and I didn’t see any issues without it there. I just want to know if it’s not on the exam’s router one whether we need to add it or not?
just a quick one, while typing these
R3(config)#router eigrp 212
R3(config-router)#network 192.168.60.0
R3(config-router)#network 192.168.77.0
don’t we need to use wildcard mask as lans attached t fa0/1 and fa1/0 on different subnets, just wondering how the router will now which is which without mask in the network statement
Jay
(config)#router eigrp 212
(config-router)#no passive-interface (specify interface here)
to check if there are any passive interfaces:
R1#show ip protocols
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
192.168.36.0
192.168.60.0
198.0.18.0
192.168.77.0
Passive Interface(s):
FastEthernet0/0
Routing Information Sources:
Gateway Distance Last Update
192.168.36.14 90 5112
192.168.60.26 90 7381
192.168.77.34 90 1635291
Distance: internal 90 external 170
there is fa0/0 in passive
thnanks 9tut, the labs are 100percent valid just wrote my exam and i got a 1000/1000, i got vtp,acl2 and eigrp labs, the eigrp is quite tricky, u need to understand the concept behind it. so instead of a missing network on the corp1 router, another network that went by the address 192.168.85.0 was added so what u have to do is issue a no network ip address command to remove it and then replace it with the correct network and that is basically the tricky part to it. exam was easy. best of luck to those of u planning to write.
kudos to 9tut!! passed my exam with a 945/1000. I got eigrp lab, acl & acl2. had to change eigrp from 2 to 22, to match other 3 routers. added network to R1. passive intereface was in R1 only so I left it alone… GL 2 all!!!!
Alhamdulillai pass the exam.
Thanks 9tut, spike dump and cbt nugget.
i passed the exam today with 81%
thanks 9tut…..
anybody know why on packet tracer i cannot ping ??
please any body explain for me :
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#end
R1#copy running-config startup-config
why didn’t remove these network
network 192.168.36.0
network 192.168.60.0
network 198.0.18.0
had this lab in exam but the no passive interface command would not work ?
anyone have any ideas ?
Regards
passed today with 1000… thnx alot 9tut !!! -CCNA (200-120) sims r still valid !!
hey chris,
It wasnt necessary to use dat command… The link between the router and ISP need not be advertised dats y it was configured dat way…basically its nt taking part in EIGRP process dats it..dats y dat command wasnt working :)
had this come up in my exam today…i made the necessary changes but when i tried to ping from Router 1 to other Routers it failed and was unable to ping from Router 3 to other routers. In the running-config from Router 1 it stated passive-interface was on Serial 1/0 with the IP’s listed below
192.168.77.33
192.168.6.0
198.0.18.6
198.2.16.0
It also had the default-network address listed
I did not remove passive-interface as Serial1/0 is the link from router 1 to the ISP.
any reason the ping failed?
good typing commands passive-interface fastethernet X / X on routers R2 R3 R4, that gives points?