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)
show ip protocols will show the wrong eigrp AS number
Hi Guys, I want to write the CCNA exam not sure where to start? any suggestions?
dude can anyone explain eigrp , i dont know how to start pls friends explain me
friends pls update complete eigrp cmds for me
pls frinds explain full concept its definitely will helpful to many friends
@go
first check AS number on each router with sh run command, should be the same fro all routers. You deffinetly will find dif one, change it for right one add networks, no auto-summary, Done. Easy as it is
Only this much sim will do or do i have to refer more for the exam ? any suggestions?
@ DNT
for non native english spoken person call pearson vue and ans for the ESL program (english as second language)
Please
if I put this configuration for EIGRP’s network does it work? does it have incidence on the note?
router eigrp 212
network 192.168.60.64 0.0.0.3
network 192.168.60.80 0.0.0.3
network 192.168.77.32 0.0.0.3
no auto-summary
Thank
hii den this works according to you wildcard the subnet mask should be 255.255.255.252
since eigrp is support classfull routing you better type network 192.168.60.0 this will display both netwoks. BUT DONT FORGET NO AUTO-SUMMARY
HII CRINKS – THE SIMS FROM HERE MAKE ME TO PASS THE CCNA. SO PRACTICE ALL THE SIMS MANY TIMES IT WILL HELP YOU.
hi go
example eigrp
>en
conf t
router eigrp 12
network 192.168.1.0
network 172.16.0.0
network 10.0.0.0
no auto-summary
(this is how enable eigrp As number 12 with networks 192.168.1.x, 172.16.x.x, 10.x.x.x )
but dont forget to type no auto-summary
hi GUYS I PASSED MY CCNA ANY QUESIONS ABOUT CCNA ?
I Geedud you re right the problem is on -no passive-interface s1/0-
In the real exam when passive-interface was on on the s1/0 and when i try to do the cmd: no passive-interface s1/0 i received the popup message saying : – cmd not supported in this version – …
hello everybody plz help me when i configure R3 in the eigrp lab and when i give the show ip route command the eigrp is not configure there even i did configure the network in r1 for r3 but its not pinging kindly let me know whats the problem
Thanks hi
hi maria–
try this command – show ip eigrp proto
and check “passive interfaces”
and advertise your networks let say r1 connected to r2 with the subnet 192.168.2.1 /30
r1 network =192.168.2.0
r3 network =192.168.2.0
good luk crinkiks
@Bobb & Geedub
why u want no passive interface on S1/0 of R1..!?!?!?
S1/0 of R1 have to remain passive…
Passed my ccna exam today!!! Praise GOOOOOOOOOOOOOOOOOOOOd!!!!! Jesus Christ is my Lord!!!!! He is the way and the truth and the life!!!!1
Quick question everybody:
i am confused…if i get a passive interface on a line connected to the main router (not considering the line connected to the ISP)
do i have to do : “no passive interface …. ” on that respective line connected to the main router ?
Please reply need help
hi kunal
if passive interface on isp interface leave as it is
if passive interface on any other interface u can use no passive inter fa?/? according to your requirments.
plz help…..
R3#show ip route
Codes: C – connected, S – static, I – IGRP, R – RIP, M – mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2, E – EGP
i – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, ia – IS-IS inter area
* – candidate default, U – per-user static route, o – ODR
P – periodic downloaded static route
Gateway of last resort is not set
192.168.36.0/30 is subnetted, 1 subnets
D 192.168.36.12 [90/2172416] via 192.168.77.33, 00:09:46, FastEthernet0/0
192.168.60.0/30 is subnetted, 7 subnets
D 192.168.60.24 [90/2172416] via 192.168.77.33, 00:09:46, FastEthernet0/0
C 192.168.60.64 is directly connected, FastEthernet0/1
C 192.168.60.80 is directly connected, FastEthernet1/0
D 192.168.60.96 [90/2174976] via 192.168.77.33, 00:09:46, FastEthernet0/0
D 192.168.60.112 [90/2174976] via 192.168.77.33, 00:09:46, FastEthernet0/0
D 192.168.60.128 [90/2174976] via 192.168.77.33, 00:09:46, FastEthernet0/0
D 192.168.60.144 [90/2174976] via 192.168.77.33, 00:09:46, FastEthernet0/0
192.168.77.0/30 is subnetted, 1 subnets
C 192.168.77.32 is directly connected, FastEthernet0/0
198.0.18.0/30 is subnetted, 1 subnets
D 198.0.18.4 [90/20514560] via 192.168.77.33, 00:09:46, FastEthernet0/0
R3#ping 192.168.60.24
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.60.24, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 2/3/5 ms
R3#ping 192.168.60.64
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.60.64, timeout is 2 seconds:
hello…..Is thr any mistakes over here? plz see the ping output..
@ hi
Thank you for your reply…and please answer my one more question…..if default-network and static route to ISP is not configured…should i set it?
for eigrp what are given in 9tut is it enogh comment or i wana change anything pls guys help me ,i did all thing but not working for me on 7thi have exam pls friends help me
Alhamdulillah! I passed my CCNA exam today thanks to 9tut and exam collections. The colisio dumps is still about 95% valid and there were new questions in the exam . Moreover it will be better if you understand the basis.
Hey ppl,,,
One small doubt:::Just for clarity!!
1.Like is it that at the end of EIGRP lab all the routers(R1,R2,R3,R4,ISP) communicate with each other?!
2.Or is it that communication between R1,R2,R3,R4 + R1 and ISP alone is enough?!
3.Is it necessary that ISP should be able to send packets to all routers or to router1 alone>?
Thanks in advance! :)
Sup Maimunah,
What was ya SIM questions in the exam? am planning to write in 5days time. Thanks.
@MVP
1. R1,R2,R3,R4 can communicate each other.. R1 and ISP can communicate..
2. is enough for the Lab.. In real life, if someone from outside wants communicate with R2,R3,R4 then ISP must have a static route to the routers..
3. its not necessary on this Lab (at the end, we can’t access to ISP router, no PC connected via console, so no modifications)
My point of view, of course
@MVP: Yes, I agree with Gio point of view.
the changing of network ip is more important..atlast copy runnning config is important… by using the show running we can get the idea….
Guys saw on 9tut itself that Couple of peoples are saying they got Eigrp lab with Passive interface,, what exactly it is? & what should we suppose to do if such thing comes as lab in exam?
@Gio,@9tut
Thanks a lot for ur inputs!! :)
Also I found that I can access the CLI mode of each router by clicking on the router itself in the sim pack that I downloaded but only through the console PC terminal we are asked to modify….In the exam is it compulsory to go to the Console PC—>TERMINAL—>and then configure or directly ROUTER—>CLI—>Configure?!
1.Which is advisable?!
2.Or is all the same or different?!
Hey guys,
passed the test today. It was a bit more difficult than i thought. I spent alot of time troubleshooting this SIM due to Cisco’s faulty. The sim said basically by the time you’re done all routers should be able to communicate with one anohter. I spent 25 mins on this SIM b/c even though i had the correct setting it wont ping from R3 to the ISP. I had to wait for at least 7-8 mins for it ping. The whole time i thought i screwed up something, but it was just the slowest convergent ever.
Just thought i shared my expierience since this site helped me so much!
Thanks 9Tut – you’re the man!!
Guys,
Do I need to apply the “no network 198.0.18.0″ command to remove the eigrp between ISP and the R1/Main router? Or should I just leave it there?
Cause I know that we always don’t include the ISP connection to the company’s eigrp network. Rather, static/default routes are the appropriate routing protocol.
Will I lose points if I remove that “network 198.0.18.0″ from the config?
Hope someone could answer this asap. Cause I will be taking my exam tomorrow.
Thanks!
Pau – bar_wiz@yahoo.com
Recommendations to troubleshoot Eigrp lab
First. Ping ISP router from any working router. This prove that routing between ISP and others router working or not so in the end u can verify your works on the third router. If ping fail so i assume we should create static route from ISP to all the subnets LAN
Second. When config Eigrp if all the router are adjacen that means u config Eigrp correctly and all internal routers should be able to ping each other. If not use your skills yo troubleshoot now. You need to help yourself first b4 rely on 9tut
@Pau
That’s good point. I dont think we need to advertise the network to isp. It should be static route. My instructor always remind me do not advertise network to isp in the lab.
@DNT
Yes. I know that. But I just want to know if it is necessary with this lab sim.
@9tut
Please help! :( I really want to perfect all lab sims.
@getcyy
If you find passive interface on interfaces connected to hand devices, its ok..
If you find passive interface on interfaces connected to another router, then you have to give the “no passive-interface” to that int..
If you find passive interface on interface connected to ISP, its ok..
Important feedback from idris:
“EIGRP with a diff AS number. But bear in mind the ping from the routers to the ISP didnt work even though the question stated it is all working and in place. Waisted too much time on this and realised it must be shortfall of the sim, got 100% in the end. So just get the routing work and make sure neighbour relationship is formed by sh ip eigrp neigh”
you need to add redistribute static command on r1 in eigrp 212. cheers :)))
@Pau
I think that, during exam, I’ll remove the network 198.0.18.0 from R1 and apply a 0.0.0.0 0.0.0.0 s1/0 and redistribute static..
At the end, router ISP its not part of AS 212… ;)
hey guys i passed ccna yesterday. Thank God for that and also 9tut i am so happy for the help. but i faced some problems in the eigrp sim. no pings were going through except from new router to the directly connected one. also i advertised all networks but the added router still did not receive eigrp adverts. though the other routers learned of it. also on the acl sim, i had four requirements to write three statements. the additional requirement was to block router C’s all other form of traffic to finance web server. the last sim was vtp which was too easy slight change of questions on the sim. subnetting only two questions. just prepare hard and you will make it
Hai guys, I am about to take my final exams this monthend. the problem is I cannot open files in vce. Iam only ending up in trial copies. somebody to help
hey guys.
i have a question.
on exam should we remove network 198.0.18.0 from R1 and redistribute static route?
failed exam. EIGRP Lab, make sure you practice this one. Rescheduled for July 24th…going to get it next time…without a doubt!!
what did you do? and what you didn’t?
Hi I am planning to give exam nxt weekend, Please provide ur valuable suggestions also is tab working in exam or not? Shud we type whole command in sims or just shrtcut?
@hi
at first, take a looh to the sh run.. in my opinion, the result will be different from what we see in packet tracer (i think we’ll find a default route/default network)
remember to set the same AS number in all routers and do network command to every segment of the internal network
at last, take a look in sh run if you see passive-interface command in some interface