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)
^ I see, thanks!
How do I know in router have “passive-interface”? and how to remove it? Are there any command to show it?
Thanks,
@Needhelp
from router 3 type # sh ru
if u see f0/3 passive mode don’t care about it
we need f0/0 directed link with main router
just go to :
R3(config)#router eigrp 212
R3(config-router)#no passive-interface f0/0
#copy run start
bye
and use
#show ip eigrp neighbors
same exam today but as number 221
and same acl lab
and vtp 5 questions
Thanks you for your help ابراهيم الرميان
السلام عليكم يا شباب الحمد لله اليوم نجحته في امتحان السي سي ان ايه واحرزته 854 اللابات الموجوده في الامتحان الEIGRP & ACCESS LIST
@hamza
there is a new question??
Hi All,
After configuring all that configs. Still i am unable to ping the ISP 198.0.18.5 from other R2 R3 R4 please help.
@ karthick
what u configure just summarrzy..i think u forget to give auto summary finaly..if we won’t give this command no routing happen..or in r1 router u didn’t advertise the missing network just check it
@Anybody
@9tut
Whether can we use tab key to fill the full cmds??
Also can we use shortcut cmds in exam like we use in gns3 or packet tracer??
eg:sh run, sh ip int br, sh ip rout…
thanks..
sad news..i fail my second attemp…just got 700++…will try again later…sim..eigrp..vtp and acl..lot of new guestion on frame relay..
This lab, VTP and Access list 2 came in exam. Be sure to do them if u prepare CCNA exam.
I failed my exam today. The sims were the same EIGRP, VTP and ACL2. On this lab EIGRP I found that the router 1 was advertising 3 additional and different networks. My question is should I delete those networks next time or just leave it like that? I just did what you explained on the lab I mean add the R3 network without delete those others routes.
Shah, where do you think you went wrong on the exam? Are the frame-relay questions any different than the ones on this site? Please give more feedback if possible. Thanks
Thanks 9tut… Passed exam today got 894… lab EIGRP, VTP and ACL2..
configure terminal on routers R2 and R4 are unable to use, is that normal???
in my exam today
@mcl: In this lab you can configure on all 4 routers R1, R2, R3, R4 but only R1 and R3 need to be configured.
but my exam was today and i was unable to enter the configure terminal command con routers branch 1 & 2. Got a message “command dissable in this version”, i make a comment on the question, any idea of this???
Thanks
i fail the exam with 788, very sad….
in this sim where i can ping .and how can ping say the ip adsdress please.where i gave the no passive int command in which interface
after configuring i am not able to ping and where and which port i give no passive
int comm
say answers to my question please
By the grace of God i m ccna certified scoring 1000 in 12-12-2012 exam and very thankful to 9tut and SEKHARS & others and dont be scared like me as i m very confused by reading some comments and i got all three famous sims
1.vtp
2.eigrp
3.acl.
And good luck to all whos opting for the exam
Lot of thanks to 9tut………..
TY 9tut.
Today I have passed the CCNA. (860/825)
50 questions 3 labs (VTP, EIGRP, ACL). 35 from 9tut.
Also thanks a lot Brar and Sekhar
Ty again 9tut
Hi all, im preparing for my CCNA exam this Dec 21th. My question is, after i fixed the issue with the AS in R3 and added the network in R1, with this im available to ping all routers from R3, with this i answered the question? with this will be enough to score 100%?. Because in the SIM I tried to ping from one host to another(host in R3 to host in R4)but they didnt ping. Thanks in advance guys!
@TDy11 please could you let us know which 35 questions (sections) in 9tut are you referring..
hi 9tut ,
i wish to ask that after completing the missing configurations correctly in this eigrp , i could not able to ping ……….is that needed to give ip address in each pc(a,b,c,d,e)
hi 9tut ,
please response to my ques ….. its my humble request
any one pls give me ans
@harry: The IP addresses have been already given in each PC so you don’t need to assign them. If you could not ping then it was another fault in the configuration.
@Wero,
Hi Wero, I suspect because you cannot ping one host from another using Packet Tracer is because the IP address and Gateway for each host is not defined and need to be configured before you can actually ping hosts. But there is full connectivity between routers.
If you want to be able to be able to ping using hosts, you will need to configure the IP addresses for each host with their gateway address.
Hope that helps.
Regards,
Remy
I took the exam yesterday,
In EIGRP, router1 was configured with one additional network x.x.80.0
which not belongs to any network given, not to confuse it with the Internet network!
anyway what I did I remove x.x.80.0 and I add x.x.77.0
I got 100%
can you send the latest dumps on faizan_jehangir88@hotmail.co.uk? Thanks
router eigrp 212
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
!
ip classless
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
sorry..
did you add passive-interface on serial0/1 and
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
——————–
router eigrp 212
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
!
ip classless
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
hi 9tut,
please clarify….
in EIGRP SIM, do we need to configure on R1- serial 1/0 as passive-interface and
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
@jjjjjjjjjjjj: No, we don’t need to configure them.
sir plsss reply
@rajesh
forget the passive : ) we don’t need in the exam
just change as number
and add network
no auto-sumrry
copy run start
bye
can you send the latest dumps on satperm@gmail.com ? Thanks
passive interface was present in Serail 0/1 in my exam…
I forget to add the static route ..eventhough I lost only 20 marks in this SIM..
##### ignore the previous comment ######
passive interface was present in Serial 1/0 in my exam…
I forget to add the static route ..even though I lost only 20 marks in this SIM…
where we can gave default route cowboy
please say cow boy
@raj dont worry about passive interface on serial 1/0. had it on my exam today and i left it there. it was link to ISP. i passed 973/1000. you only remove it if it is on interfaces connecting to other routers not the interface to the ISP.
Could anyone explain me about passive interface part in eigrp?
I find it a bit confusing please help.and also commands to solve this 3rd part passive-interface
Could anyone explain me about passive interface part in eigrp? Also commands to solve this 3rd part passive-interface