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)
@anonymous:
from router 1 do show running-config,here is an exple:
router eigrp 212
passive-interface Serial0/1
passive-interface Serial1/0
network 192.168.36.0
network 192.168.60.0
network 198.0.18.0
no auto-summary
!
ip classless
!
!
!
!
–More–
THX
Thanks Doumbia! Much appreciated!
Hello I have seen where people who post say they have to remove an Network IP but 9tut doesn’t show that in there diagram can somebody explain this to me? Thanks in advance!
Question why do we check router 1 and input this information and not check the other routers such as 2,3,4 routers I want to know how we know to check Router 1 and why do we put this info below into router 1? I am confused? So if we update ROuter 1 with info of router 2 it updates vis EIGRP to the other routers?
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
I am sorry here is the revised question:
Question why do we check router 1 and input this information into router 1 and not check the other routers such as 2,3,4? I want to know how we know to check Router 1 and why do we put this info below into router 1? I am confused? So if we update Router 1 with info of router “3″ it updates vis EIGRP to the other routers? 2,3,4??
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
@Moez I just passed my exam 2day (thank god for that) ! And In my exam they let me use IOS help and tab ! but i don’t use it anyway bc i allready remember it and I still recomend you to learn it by heart though.
I wish you a very good luck Mike and I wish you will pass it. I’m still preparing and I didn’t book mine yet.
if you failed two weeks ago are you likely to get the same acl2 vtp and eigrp sims?
@mina
Thanks Mina;)
has anyone had a retake and the sims were pretty much the same?
if console is connected to r1, how do you telnet to r3 to make config changes?
Sir
i am going to take exam tomorrow .i download 9tut Eigrp sim question lab”
but i see in “eigrp question aswers sim” that when i ping the Isp from R1 ..its successful and when i try to ping ISP from other routers ..its fail ..why?
kindly tell me ..is this necessary that ISP should communicate with other routers in EXAm..if necessary, what types of the commands should on R1 with ip addresses .
kindly Answers me urgently
@Hamid: You don’t need to ping the ISP router. Just make sure you can ping among routers.
But already Explained in sim .that verify all routers communicate to each other?
느그들은 영어 잘해서 좋겠다.
@Hamid: Without looking into SIM… I’m pretty sure the reason is because NAT translation neet to be installed on Router 1 to simulate a true connection to public addressing. However, you could just set up static routes between R1 and ISP.
This seems to be a good example of possibly reading into the sim too much. It states in the scenario “inter connectivity and Internet access for the existing locations of the computer are working properly.” Therefore, you ignore any other issue you might see because this SIM is focusing on troubleshooting EIGRP and not NAT/Static routes unless it otherwise states to do so. Hope this helps. Look into the NAT SIM if you are uncomfortable with NAT.
THank u very much Sir
Using 9tut eigrp sim i run the command
R1#show ip eigrp neighbor
IP-EIGRP neighbors for process 212
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.77.34 Fa0/0 11 00:00:35 40 1000 0 15
1 192.168.36.14 Se0/0 12 00:00:27 40 1000 0 11
2 192.168.60.26 Se0/1 12 00:00:26 40 1000 0 11
R1#show ip eigrp topology
IP-EIGRP Topology Table for AS 212
Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply,
r – Reply status
P 192.168.77.32/30, 1 successors, FD is 28160
via Connected, FastEthernet0/0
P 192.168.36.12/30, 1 successors, FD is 2169856
via Connected, Serial0/0
P 192.168.60.96/30, 1 successors, FD is 2172416
via 192.168.36.14 (2172416/28160), Serial0/0
P 192.168.60.112/30, 1 successors, FD is 2172416
via 192.168.36.14 (2172416/28160), Serial0/0
P 192.168.60.24/30, 1 successors, FD is 2169856
via Connected, Serial0/1
P 192.168.60.128/30, 1 successors, FD is 2172416
via 192.168.60.26 (2172416/28160), Serial0/1
P 192.168.60.144/30, 1 successors, FD is 2172416
via 192.168.60.26 (2172416/28160), Serial0/1
P 198.0.18.4/30, 1 successors, FD is 20512000
via Connected, Serial1/0
here is “p” indicates the passive interface ..is it necessary to remove all passive invidually running with “no passive-interface”
command on every interface?
Passive route it’s good, active bad. Passive routes EIGRP using as successors, to forward traffic
Are the how to pass questions valid for exam?
IF console is connected to R1, how do you telnet to R3 to make config changes ON EXAM?
theres console connections to all routers
now how to check that the task done correctlly in EIGRP sim ?
i mean how to check that
is that by ping the isp router interface through any host ?
help plz
Thanks Bob
@mido… This lab is about EIGRP and the question states
“All other inter connectivity and Internet access for the existing locations of the company are working properly.”
The only goal in this SIM is to have R3 form adjacency with its neighbor (R1). There is no need to ping to other routers because the are “working properly”.
Your ping to ISP will fail due no NAT configuration.
You only need to verify the routing table = SHOW IP ROUTE
and EIGRP neighbor adjacencies = SHOW IP EIGRP NEIGHBORS
Open the lab and run those commands first (on R3 and R1), then follow the instructions above and use the commands again. That is how you know you fixed this issue.
Do not forget that you have to anouce the network of the link between R1 and R3.
I had this one and forgot about that.. spent 30 minutes trying to figure it out.
I had to anouce the network that was attached to the R1 and the link.
Normaly you see that you just have to make one anoucement in the R1.
Is it necessary to add the 192.168.77.0 statement to R1 since it is a directly connected route for R1?
failed .. 815 after doing 2 sim complete ..Acl,vtp and Eigrp there is adjancy among routers and ping successfully .i dont know why???
thought the pass mark is 800 or am i wrong?
DDY
maybe in the multiple choice questions or maybe its either in acl or eigrp configurations
goodluck to me this coming thursday..
Pass mark is 825. I got 811. Resitting the exam this week
Which cmd shows your active telnet connections?
shekar dump = show sessions
jerico dump= show users
which 1?
Bob,
Show sessions is the correct answer.
cheers red.
show YOU active telnet connections = show users
show YOUR acive telnet connections= show sessions
@ bob you took the real exam and there were con port on all the routers?
Yes @melo.
Bob were the simulations you saw pretty close to 9tut? If so what were the major changes you saw on the exam that was different from 9tut? Thanks in advance for your response.
ACL SIM: similar but host D instead of host C.
EIGRP: Incorrect AS # on the new router & missing a network statement on R1
VTP: different to 9tut but if you know your concepts, its ok.
Thanks Bob!
thanks bob
No problem.. good luck in the exam
May i take Exam
on voucher again in retake date ..if i failed in exam????
I thinks these 2 commands:
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
shoud be replaced with:
ip route 0.0.0.0 0.0.0.0 198.0.18.5
router eigrp 212
redistribute static
because this is the way to redistribute default route to EIGRP that taught in CCNA course. The ip default-network is just introduce in a few lines and with a link to learn more.
Any idea?
Passed exam today.Just 881. Had this sim with EIGRP. Almost the same, except for the the names of the routers, ip address and AS number.
Don’t know if the sim had bugs, but i couldn’t solve it.
The AS was 12 on the routers and 22 on the new router. Had to issue no router eigrp 22 command and then router eigrp 12 along with the network commands and the no auto-sum. That was all. Also had to make sure that on the link between the new router and the one attached tot it was advertised.
Did all that. No adjacency formed. No debuging allowed, no eigrp restart, no nothing. K values where the same, ping worked, but no adjacency. Tried to put passive-interface and then could not issue the no passive-interface. Lost points on this question :|
Praise be to ALLAH, passed today narrowly with 841. thanks to 9tut and examcollection EIGRP, ACL2 and VTP were the labs. watch out for drag and drop questions.
wish you all the best.
God bless.
@MAURIS. When I first sat the ccna, there was an interface that needed the “no shut” command. That could be the issue with your non-adj.
You passed, which is the main objective.
@bob.
Ping was successful between the routers, so “no shut” is out of the question. I am 99.99% sure it was a simulation bug. My main objective is to be confident on my Cisco (networking) knowledge, not to pass some exams. I have prepared (academy and self study) for the CCNP R&S before taking my CCNA exam. This is why i am upset about this “misunderstanding exam question” :)
All the best!
Anybody know if pass4sure are valid? I know I have heard of colliso and Jericho dumps, but arent those the same as pass4sure?
@Marius
I’m with you mate. Sims are having bugs. When I was taking my exam, on ACL2 sim set all access-list, checked everything, aplyed on interface saved it. Then issued show startup-config, just to make sure it’s saved and its showed me only half of my configuration, another half was missing. I double check running config, again copy run start, after show start same picture. But in the end got 100%. Strange