EIGRP OSPF Redistribution Sim
Question
Answer and Explanation:
First we need to find out 5 parameters (Bandwidth, Delay, Reliability, Load, MTU) of the s0/0/0 interface (the interface of R2 connected to R4) for redistribution :
R2#show interface s0/0/0
Write down these 5 parameters, notice that we have to divide the Delay by 10 because the metric unit is in tens of microsecond. For example, we get Bandwidth=1544 Kbit, Delay=20000 us, Reliability=255, Load=1, MTU=1500 bytes then we would redistribute as follows:
R2#config terminal
R2(config)# router ospf 1
R2(config-router)# redistribute eigrp 100 metric-type 1 subnets
R2(config-router)#exit
R2(config-router)#router eigrp 100
R2(config-router)#redistribute ospf 1 metric 1544 2000 255 1 1500
Note: If the delay is 20000us then we need to divide it by 10, that is 20000 / 10 = 2000
Note: “usec” here means microsecond (which is 1/1000 milliseconds). According to this link: http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml#eigrpmetrics: “The delay as shown in the show ip eigrp topology or show interface commands is in microseconds”)
For R3 we use the show interface fa0/0 to get 5 parameters too
R3#show interface fa0/0
For example we get Bandwidth=100000 Kbit, Delay=1000 us, Reliability=255, Load=1, MTU=1500 bytes
R3#config terminal
R3(config)#router ospf 1
R3(config-router)#redistribute eigrp 100 metric-type 1 subnets
R3(config)#exit
R3(config-router)#router eigrp 100
R3(config-router)#redistribute ospf 1 metric 100000 100 255 1 1500
Finally you should try to “show ip route” to see the 172.16.100.1 network (the network behind R4) in the routing table of R1 and make a ping from R1 to this network.
Note: If the link between R2 and R3 is FastEthernet link, we must put the command below under EIGRP process to make traffic from R1 to go through R3 (R1 -> R2 -> R3 -> R4), which is better than R1 -> R2 -> R4.
R2(config-router)# distance eigrp 90 105
This command sets the Administrative Distance of all EIGRP internal routes to 90 and all EIGRP external routes to 105, which is smaller than the Administrative Distance of OSPF (110) -> the link between R2 & R3 will be preferred to the serial link between R2 & R4.
A reader on our site has a closer explanation for the “distance eigrp 90 105” command so we quote it here for your reference:
|
The “distance” refers to the administrative distance of the routes provided by a given routing process. By default, internal (which means non-redistributed) EIGRP routes are given an administrative distance of 90 while external (redistributed from another routing process) EIGRP routes are given an administrative distance of 170. The default administrative distance of OSPF is 110. The administrative distance measures the “distance from the truth” and tells the router which routes are more trustworthy. Lower administrative distance = more trustworthy. For this reason, connected routes have an administrative distance of 0. They are the MOST TRUSTWORTHY, because they are physically connected to the router. When making a decision about which route to install in the routing table, the router looks at administrative distance first. The metric (or cost) is only considered if two routes have the same administrative distance. In this case, R2 will learn about R4’s loopback network from both R4 and R3. The route from R4 will be in OSPF (admin distance of 110) because R2 is also running OSPF while the route from R3 will be an external EIGRP route (administrative distance of 170 by default). Since the OSPF route has a lower administrative distance, it will get placed in R2’s routing table and the R3-provided route will be ignored. This is not optimal, since the path through R3 is a faster, more reliable path. To fix this, we change the administrative distance of external EIGRP routes at R2 by using the “distance eigrp 90 105” command. This sets the administrative distance of internal EIGRP routes to the default of 90 and changes the administrative distance of external EIGRP routes to 105 (less than that of OSPF routes). Now, when R2 learns of the loopback network from R4 and R3, it will install the now lower administrative distance external EIGRP route from R3 and our traffic from R1 will take the faster path. |
Note: Please check the OSPF process numbers first before typing these commands.
If you want to have a closer look at this sim and understand more about the “distance eigrp” command, please read my OSPF EIGRP Redistribute Lab in GNS3.
Other lab-sims on this site:
Hey friends, who took the exam recently? the labs are still:
PBR
Redistribution
OSPF
EIGRP
OSPFv3
??
Appreciate the help.
Hello,
Why are they using metric-type 1 instead of redistribute eigrp 100 subnets??? I don’t get it
router ospf 1
R2(config-router)# redistribute eigrp 100 metric-type 1 subnets
Airon, check this one https://learningnetwork.cisco.com/thread/10435
@elv thanks for sharing the link. Now I understand the reason of using metric-type 1
Hello, what is the difference for case1 and case2?
i see the distance command, but for me looks like we should use it in both cases
I don’t think that you’re required to use the distance command in the sim. The guy tried to go extra mile to show you how you can dictate/control which path you should go thru to get to router 4.
Can anyone please send me the latest 300-101 dump to me ?
jigar231@gmaildotcom
Hello!
Why on the router R2 and R3 redistribution is done in OSPF 1, when on the topology it is visible that the interface s0/0/0 of the router R2 is connected in the direction of Ospf 24 and R3 in the ospf 34 fastethernet connection
I think the config should be so
R2 (config)#router ospf 24
R2 (config-router)#redistribute eigrp 100 metric-type 1 subnets
R2 (config-router)#exit
R3 (config)#router ospf 34
R3 (config-router)#redistribute eigrp 100 metric-type 1 subnets
R3 (config)#exit
And what do you think?
@bakstot The OSPF process for all routers is 1. The area is 24 and 34 but all OSPF routers participate in process 1.
This simple, at first glance, lab requires more time to understand it than it may seem. I have tested it and now it’s looks clear. Just a little bit for understanding about metrics of type E1. I think in real life we don’t need specify type E1 distinctly. Yes, in this case we will get the same metrics for R1’s network on both links on R4 – 20. But, in this case, R4 will use the best path to ASBR(s) as tiebreaker. The path via R3 is better, because there a Fastethernet link between R4 and R3, so it will be used for reaching ASBR and R1’s network. Thus, doesn’t matters will we use E1 or E2. But using E1 makes this choice more clearer, of course. Besides, the implementation of OSPF algorithm in SIM environment may be incomplete, so it’s better to distinctly specify the E1 type.
From all the above, one more conclusion follows. If there is no FastEthernet between R2 and R3, we MUST specify the E1 type on R2 for the same reason – path to ASBR(s) as tiebreaker. Otherwise R4 will always prefer path via R3. But when we will redistribute with E1 type on R2 and E2 type on R3 the best path from R4 will be via R2 (in case with Serial link between R2 and R3). Possible, this SIM doesn’t delve into subtleties of OSPF so much and just test our competence in E1/E2 choice. May be we need to specify different types on each link anyway. I don’t know.
@J Thanks. I fooled.
In this scenario we can use metrics type E1 or E2 as the next-hop is the ASBR. The reported metrics will be exactly the same on R4 (20).
Thanks for better explanation.
I completely understand the lab now
Hi guys, I passed my route exam today. Despite the fact that i mistakenly moved to the next question in the exam without configuring a lab sim. I totally lost hope initially until the result was out. You can also make the exam once
email me to get preparation material i used and guide.
tomiwas64 @ gmail . com
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hello ,
if i do ping from R1 TO R4 the ping route is
R1-R2-R4
AND WHEN THE PING RETURN THE ROUTE IS:
R4-R3-R2-R1
i dont understand the metric type 1 …
I’ve just noticed that doing this lab like it’s explained in the solution we have ASYMMETRIC routing!! is this expected?
The way from R1 to R4 will be R1 -> R2 -> R4, that’s OK.
But the way back from R4 to R1 will be R4 -> R3 -> R2 -> R1
And that’s because when we configure redistribution of EIGRP to OSPF on both R2 and R3, we see that metric is better in the redistribution of R3 since the link R3-R4 is FastEthernet and has better bandwith and delay than the link betwen R2-R4. So R4 chooses R3 in the way back to 192.168.1.0 as we can see in the routing table:
R4#sh ip route
…
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.100.0 is directly connected, Loopback0
C 192.168.4.0/24 is directly connected, FastEthernet0/0
O E1 192.168.1.0/24 [110/30] via 192.168.4.2, 00:02:35, FastEthernet0/0 <—
O E1 192.168.2.0/24 [110/30] via 192.168.4.2, 00:02:35, FastEthernet0/0
C 192.168.3.0/24 is directly connected, Serial0/0
R4#
Does anybody else noticed that? what do you think? is correct?
Why we need to use metric-type 1 command?
If we don’t use it, It will be E2 type in osps.
Can some one please explain.
Please peeps…..i have booked my CCNP route, can i get any latest 300-101 dumps please. please i really need it guys. Appreciate
{email not allowed}
@Cy use the link on the right side of your screen, “Share your ROUTE v2.0 Experience” to get all the latest information as regards the route exam from people who just wrote theirs.
could the interface S0/0/0 output be shown in this page? To compare between what is expected to see on the interface versus what to configure in the redistribution command, please!
In the GNS3 file, Router 1 does not have a loopback address…
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Please I need if you can get me the latest CCNP tesking,
for certification, my email is {email not allowed}
Hello, One question!
show interface s0/0/0 on GNS, gives this output:
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
there are two load numbers Which one should I write for load number????
I hope it is not so in the exam :)
Should we use the distance command or not?
Can anyone share the question of this lab? Thank you
Who exam during these days
Is there a change in SIM LAB
Hi
somebody could send me actual question to sys.yuriy at gmail.com.
Thanks a lot.
Asymmetric route happen because ospf is advertising the route 172.16.100.x to R2 and R3 with only 110 as AD. Remember that we have 170AD in eigrp external. If you will enter the distance eigrp 90 105 – the R3 will now be preferred. OSPF 105<110 EIGRP EX . Hope this helps :)
Apologies correction
Asymmetric route happen because ospf is advertising the route 172.16.100.x to R2 and R3 with only 110 as AD. Remember that we have 170AD in eigrp external. If you will enter the distance eigrp 90 105 – the R3 will now be preferred. ***EIGRP EX 105<110 OSPF***. Hope this helps :)
Failed on my exam last saturday with a 683/790 score.
I get this SIM and increased the distance form ospf on router R2 to 255 and solve the path problem.
But i forgot to check the traffic from R4 to R2 and R3.
Hi, unfortunately I have failed the exam. Used the pass4sure material that can be renamed to fail4sure! If you are thinking on purchase these material, you better think twice.
The labls are quite the same. Just do the labs from here and you will be ready to do the labs in the real exam.
There are a lot of questions related to Frame-relay LMI, NAT-PT, NAT64, ACLs , A/A/A, mGRE, uRPF loose/strict and EVN.
@ciscondiro rxload=input late, txload=output late. But don’t mind about it and just write 1.
GL for your exam.
i think the distance eigrp 90 105 or 109 is required to choose the link on R2 to R3 to R4. and
it doesn’t matter is we use E1 or E2 on the redistribution.
Hi ALL!
EIGRP and OSPF Redistribution Lab
Can anyone tell me if the distance eigrp 90 105 is still needed even if the connection on R2 and R3 is serial link?.
Based on the note on the lab use distance eigrp 90 105 if the link between R2 and R3 is Fastethernet, what if the link is serial do i still need to use distance eigrp 90 105?.
Thank you.
hi all
why the value of fa 0/0 on r3 and no of s0/0???
Hello all,
I have some doubts that I step to expose, I understand that in the tables of routes OSPF of R2 and R3 we will find a route towards the 172.16.100.0/24 with an AD of 110, now, so that this network can be accessible from all the domain EIGRP (R1) it is necessary to redistribute as much in R2 as in R3, as it shows the LAB, with which R2 and 3 announced the route towards the domain EIGRP with an AD of 170.
Is that correct?
Regards
I passed ccnp route exam 300-101 on october 11 2018 with 880 scores.I had 3 sims:
– EIGRP OSPF Redistribution Sim
– IPv6 OSPF Virtual Link Sim
– OSPFvirtual link
all IPs, names, configs are same.and also I had 53 questions.
Today’s exam 834 score, Lab eigrp – ospf – redistribute-Drag – Drops Frame-Relay – GRE – Trafic
The network requirements state that you must be able to ping and telnet from loopback 101 on R1 to the OPSF domain test address of 172.16.100.1.
On the configs there is no lo 101 ??
The ping should be from the looback interface
ping 172.16.100.1 source loopback 101
Are you guys sure there is no any part missing from this lab ?
Hi guys any latest dumps for 300-101.
my exam is in the end of the month
this is my email : {email not allowed}
thank you
Hi guys any latest dumps for 300-101.
my exam is in the end of the month
this is my email id : omermuktaryan at gmail dot com
thank you
Hi guys.
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@team_shark
you didnt reply about your paper
Can you please share question for this Lab – EIGRP OSPF Redistribution Sim