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)
Finally in router 1 you have 4 network statements?
Regards ¡¡
somebody help, i take my exam on saturday 11 please what drag and drop can i use thanks !!
how will i know if passive-interface is set on routers? what command should i use?
Did the exam today, passed. Change: hostnames (didn’t matter anyway), the router is on the left hand side, eigrp 23 is the AS. Rest is still valid to the bit (as far as i can remember XD).
to see if an interface is passive issue the show running-config command, there you will see beneath
router eigrp 22 passive-interface fa0/0
or something like that.
i recommend to issue show running command always at first, you have enough time 90min in the exam (especially if your mother language is other than english 120min) I finished in 65min. and did the sims in 6-7mins. But you can take your time, you won’t get extra points from being fast XD.
on the real exam i saw passive interface between r1 and r3 the passive is in the r1(G) do we still in to do the no passive interface? thanks
@bumbum thanks alot this will help me tomorrow
thanks 9tut
@ nikhil.. there u go buddy!!
http://www.4shared.com/file/Z3Ipz6dI/Packet_Tracer_53___setup.htm
@ 9TUT
if passive-interface is between R1 and ISP .MUST SET STATIC ROUTE ON R1 TO ISP
IP ROUTE 0..0.0.0 0.0.0.0 198.0.18.6
No we do not seed to set, just take an example
you are client ie R1 and ISP is admin, will he provide full access of ISP router to you.
No, i never do it
This ccna exam does not allow us configure ISP
why we use passive-interface and no auto-summary command in eigrp lab?
what is the actual purpose of it?
in R3 show running-config , in table
interface fastethernet 0/0
ip address 192.168.77.34 255.255.255.252
my Question is , how last parameter 252 comes i can’t understand , bcz , there was no subnetmask mentioned, how we determined it . other also 240 in next……………
Hi all ¡¡
I have 2 doubts.
-Finally i remove the passive-interface command in all the interfaces of R1 except the link to the isp. ¿Its correct?
-Its necesary to put the default-information-originate in R1 if the command not exist?
Best regards
hello……if we r asked to make all the hosts to access the internet, in the same EIGRP lab, how could we do it??
does any1 know abt this?????
Anybody know how to do this sim
Regional 1
regional 2
store 1
store 2
Did anyone here have a problem with going back to the network diagram (when taking the test) once you’re in the router via console port? I tried exiting but all I can see is that term window. It’s like I can not go back to the net diag once I access the routers?
@9tut
Hey…why dont you update pkt labs here, so many are facing doubts regarding labs
guys i need the latest dumps link
i will give my exam on 20th june
hey guys… i have noticed these are for the 640-802 exam (ccna)
i have already passed the 640-822 and am getting ready to sit for the 640-816 exam. has anyone sat for the 816 and gotten the sims that are listed here?
i would hate to focus on VTP, ACL and EIGRP and then get different sims because its the ICND 2 exam. of course i am going to study and learn concepts for it all regardless but would like to be able to focus in on the important ones.
thanks,
nvm… i just found the other site… cheers!!
@9tut
If the “passive-interface” is in the link between R1 and R3 (or R2, R4) then we have to do like this:
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
===============
do we still need to put this:
If the “passive-interface” is in the link between R1 and R3 (or R2, R4) then we have to do like this:
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#network 192.xxx.xxx.xxxx
R1(config-router)#end
R1(config-router)#copy running……
or this is the only command if theres a passive
:
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
============
thank u….. waitng for the quick reply.
@Safi: In fact, these networks have been already configured so we don’t need to type them again. But if you find a directly connected network which is not advertised then you have to advertise it.
@9tut,
so if we so passive we only need to do this command
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#end
R1(config-router)#copy run config startup config
many thanks 9tut
and if ever we saw that theres a network that is not advertised thats the time we do this command?
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#network 192.xxx.xxx.xxxx
R1(config-router)#end
R1(config-router)#copy running……
================
Right 9tut? many things waiting for kind reply
@Safi: Yes you got it! Maybe in the exam you will only see the “passive-interface” between ISP & R1 routers and we just ignore it.
Be careful with the VTP sim as some candidates accidentally clicked “next” after answering the first question. This action will ignore all other questions in that sim! So make sure you answer all 5 questions in that sim before clicking “next”.
Best wishes in your exam!
@9tut,
thanks for help…. i understand now..
do u know what is the percent /score per question? thanks
@9tut,
last question what if link between R1 to R2 (or R3, r4) have passive we know that we need to remove that…. uhm but what if theres a wrong AS number in r2 or in any router…..
do we still need to correct that like this command…
R1#configure terminal
R1(config)#no router eigrp 22
R1(config)#router eigrp 212
R1(config)#network 192.xxx.xxx.xxx
R1(config)#network 192.xxx.xxx.xxx
R1(config)#no auto-summary
R1(config)#end
R1(config)#copy runn startup config
then theres an passive/not advertised the ip
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#network 192.xxx.xxx.xxxx
R1(config-router)#end
R1(config-router)#copy running……
then passive ip advertised but wrong AS
R1#configure terminal
R1(config)#no router eigrp 22
R1(config)#router eigrp 212
R1(config)#network 192.xxx.xxx.xxx
R1(config)#network 192.xxx.xxx.xxx
R1(config)#no auto-summary
R1(config)#end
R1(config)#copy runn startup config
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#end
R1(config-router)#copy running……
which one is correct or both is correct? sorry many question…..
@Safi: If you use
R1(config)#no router eigrp 22
R1(config)#router eigrp 212
then the “passive-interface fa0/0″ command will automatically be removed.
9tut,
so which command do we need to put? since you said that
R1(config)#no router eigrp 22
R1(config)#router eigrp 212
then the “passive-interface fa0/0″ command will automatically be removed.
maybe the wrong is only one…… do you happen to know that 2 wrong question on the exam…? the way i understad if theres a wrong AS no passive interface… then passive AS is correct? do you think 9tut im right? thanks many
@Safi: In general in this sim you have to fix:
+ wrong AS number in a router (maybe in R3)
+ a missing network in the main router R1
The passive-interface between R1 & ISP routers is correct and we don’t remove it.
9tut,
what if the passive is between R1-R2? and then wrong AS number in R4?
thanks
@Safi:
+ “no passive” on R1-R2
+ fix wrong AS number in R4
@9tut,
so this command is correct….
R1#configure terminal
R1(config)#no router eigrp 22
R1(config)#router eigrp 212
R1(config)#network 192.xxx.xxx.xxx
R1(config)#network 192.xxx.xxx.xxx
R1(config)#no auto-summary
R1(config)#end
R1(config)#copy runn startup config
then theres an passive/not advertised the ip
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#network 192.xxx.xxx.xxxx
R1(config-router)#end
R1(config-router)#copy running……
then passive ip advertised but wrong AS
R1#configure terminal
R1(config)#no router eigrp 22
R1(config)#router eigrp 212
R1(config)#network 192.xxx.xxx.xxx
R1(config)#network 192.xxx.xxx.xxx
R1(config)#no auto-summary
R1(config)#end
R1(config)#copy runn startup config
R1(config)#router eigrp 212
R1(config-router)# no passive-interface fa0/0
R1(config-router)#end
R1(config-router)#copy running……
many thanks
@Safi: Yes, all the above configurations are correct.
@9tut,
thanks thanks…..sorry many question….
hii , i want to know the funiction of this commands
no auto-summary
copy running-config startup-config
@phalex what do you mean you found the other site?? I am also set to do 640-816. I had assumed that the sims etc, would come from the ones on this site.
Can anyone confirm if this is the case or not, or if there is another site like 9-tut that has sims etc for 640-816?
DOH nvm, just realised there is a 9-tut.com and 9tut.net, glad i noticed this today, hoping it is all similar, fairly confident with the theory etc, just want to be sure.
@Mr Guy: 9tut.com is dedicated for CCNA 640-802 exam while 9tut.net is used for ICND1 & 2 path. You can use both sites to practice for CCNA because the concept behind is the same.
i have some pictures about the new eigrp lab, how can i send you?? we ned your help!¡¡!
@ru83n: Yes, please send it to support@9tut.com
default-information originate doesn’t work for eigrp.
it is for ospf and ripv2.
redistribute static or default-network are the options.
Suddhoshil Ghosh.
I may be overlooking something. In the table below the main picture why is the network from R1 S0/0 192.168.36.13 not listed. ??
Plz send to me lastest link 640-802 to session_zm1@yahoo.com
@ru83n: pls send me the new eigrp question i really want to study it… tnx :)
Please share the new eigrp question with me too.. my exam is on coming Monday
crest_21@hotmail.com
thanks alot
Hello share the new eigrp question or send it to f_khan0101@yahoo.com thanks
pls send me d new sim 2 i’d be writing my exam next tomorrow
my email is vickdudu@ yahoo.co.uk