EIGRP OSPF Mutual Redistribution and Filter Lab
Topology:
Tasks:
1) Ensure R2, R3 can learned all the prefixes from EIGRP 10 as EIGRP External Route (D EX).
2) Guarantee if R2 or R3 dies R1 and R4 can still access services on R7. No default route is allowed in this lab.
You can download the initial configuration file here: http://www.rstut.com/download/route_map_distribute_list_redistribute_initial_config.zip.
The IOS I used to run this lab is c2691-adventerprisek9-mz.124-5a.bin but you can use others.
Solution
Initial Configuration
| R1: int s0/0 ip address 10.10.12.1 255.255.255.0no shutint s0/1ip address 10.10.14.1 255.255.255.0no shut router ospf 1 net 10.10.12.1 0.0.0.0 area 0 net 10.10.14.1 0.0.0.0 area 0 |
R2:int s0/0ip addr 10.10.12.2 255.255.255.0no shutint s0/1
ip addr 10.10.23.2 255.255.255.0 no shut int f0/1 ip addr 10.10.26.2 255.255.255.0 no shut router ospf 1 net 10.10.23.2 0.0.0.0 area 0 net 10.10.12.2 0.0.0.0 area 0 router eigrp 300 net 10.10.26.0 0.0.0.255 no auto-summary |
R3:int f0/1ip addr 10.10.35.3 255.255.255.0no shutint s0/0
ip addr 10.10.34.3 255.255.255.0 no shut int s0/1 ip addr 10.10.23.3 255.255.255.0 no shut router ospf 1 net 10.10.23.3 0.0.0.0 area 0 net 10.10.34.3 0.0.0.0 area 0 router eigrp 300 net 10.10.35.0 0.0.0.255 no auto-summary |
| R4:int s0/0ip addr 10.10.14.4 255.255.255.0no shutint s0/1
ip addr 10.10.34.4 255.255.255.0 no shut router ospf 1 net 10.10.34.4 0.0.0.0 area 0 net 10.10.14.4 0.0.0.0 area 0 |
R5:int f0/0ip addr 10.10.56.5 255.255.255.0no shutint f0/1
ip addr 10.10.35.5 255.255.255.0 no shut int f1/0 ip addr 10.10.57.5 255.255.255.0 no shut router eigrp 10 net 10.10.57.0 0.0.0.255 no auto-summary router eigrp 300 net 10.10.35.0 0.0.0.255 net 10.10.56.0 0.0.0.255 no auto-summary |
R6:in f0/0ip addr 10.10.56.6 255.255.255.0no shutint f0/1
ip addr 10.10.26.6 255.255.255.0 no shut router eigrp 300 net 10.10.56.0 net 10.10.26.0 no auto-summary |
| R7:int f0/0ip addr 10.10.57.7 255.255.255.0no shutrouter eigrp 10
net 10.0.0.0 no auto-summary int lo0 ip addr 10.10.7.7 255.255.255.0 |
Note: On R5 and R7 if we do not write the wildcard masks in network statements under “router eigrp”, R5 will summarize to classful networks. For example on R5 if we only write the networks without wildcard masks like this:
| R5:router eigrp 10net 10.10.57.0router eigrp 300net 10.10.56.0
net 10.10.35.0 |
Then “network 10.10.57.0”, “network 10.10.35.0” & “network 10.10.56.0” will be summarized to “network 10.0.0.0” and all three interfaces of R5 will run EIGRP AS 10 and 300 simultaneously:
By using wildcard masks R5 can identify which interfaces to run EIGRP 10 and 300:
1) Ensure R2, R3 can learned all the prefixes from EIGRP 10 as EIGRP External Route (D EX)
To make R2 & R3 learn prefixes from EIGRP 10 as External routes we have to redistribute EIGRP 10 into EIGRP 300. We will redistribute EIGRP 10 & 300 mutually so that they can communicate.
Redistribute between EIGRP AS 10 & 300:
| R5:router eigrp 300redistribute eigrp 10router eigrp 10redistribute eigrp 300 |
Note: Redistribution from EIGRP to another EIGRP process does not need to declare metric but redistribution from other routing protocols to EIGRP does need to declare metric.
Now check the routing table of R2, R3 to see they have learned all prefixes from EIGRP AS 10 (including 10.10.7.0 & 10.10.57.0) as external routes.
=> So now we completed the first task “On R2, R3 ensure that all prefixes learned from EIGRP 10 should be seen as EIGRP
External Route (D EX)”.
2) Guarantee if R2 or R3 dies R1 and R4 can still access services on R7. No default route is allowed in this lab.
“Guarantee if R2 or R3 dies R1 and R4 can still access services on R7” -> to achieve this task we need to redistribute OSPF & EIGRP on both R2 and R3.
| R2 & R3:router eigrp 300redistribute ospf 1default-metric 10000 100 255 1 1500 //When redistributing into EIGRP we need to set seed metricrouter ospf 1
redistribute eigrp 300 subnets |
Just for your information, the question says “No default route is allowed in this lab” to prevent us from configuring one-way redistribution and using a default or static route in other part.
This is the end of this task but we want to discuss another question: will it cause a routing loop when doing bi-directional redistribution on two routers? Some people explain the redistribution loop like this:
1. R7 advertises prefix 10.10.7.0/24 to R5 as internal EIGRP route (AD = 90)
2. R5 learns and advertises 10.10.7.0/24 as External EIGRP (D EX) route to R3 & R6 with an AD of 170.
3. R6 also advertises this prefix to R2 with the same AD of 170.
4. But R3 & R2 will advertise this prefix with an AD of 110 to each other because they see this route as External OSPF route (O E2).
The AD of 110 is better than the AD of 170 so R2 & R3 will consider they have just learned a new “better” route. Therefore R2 will set R3 as its next-hop to the prefix 10.10.7.0/24 and R3 will set R2 as its next-hop to the prefix 10.10.7.0/24 -> a routing loop occurs.
Is it true? Let’s check the routing tables of the prefix 10.10.7.0 to see what they have learned.
 |
 |
 |
 |
 |
 |
From the outputs above we can draw how the routing updates of 10.10.7.0 were sent out (represented by red arrows):
In fact, the routing tables only shows the optimal (best) routing updates that have been accepted and updated into the routing tables. For example R3 also sends routing updates to R5 about prefix 10.10.7.0 but it is not the best path so it is not displayed in the routing table of R5. We can check with the “show ip eigrp 300 topology all-links” on R5:
-> We can see that R5 also receives advertisement of 10.10.7.0 from R3. So does R5 sends advertisement of 10.10.7.0 to R3? The output of “show ip eigrp 300 topology all-links” command on R3 reveals this:
-> R5 still advertises 10.10.7.0 to R3 but it is not updated in the routing table of R3 because of worse AD.
Another question is if R3 sends advertisement of 10.10.7.0 to R2. We can check that with the “show ip ospf database adv-router 10.10.35.3” command.
-> R3 does not send advertisement of 10.10.7.0 to R2 because of split horizon rule (R3 has already received advertisement of that prefix from R2).
Note: “10.10.35.3” is the router-id of R3. You can check the router-id of a router by the “show ip ospf” command.
In this lab a routing loop would not occur between R2 & R3 because after R2 learned about prefix 10.10.7.0, it advertised this prefix to R3. Although R3 still learned about this prefix via redistribution (from R5) but the prefix 10.10.7.0 advertised from R2 has better AD so R3 accepted this path -> R3 sets R2 as its next-hop for this prefix.
In conclusion, mutual redistribution between EIGRP and OSPF on two or more routers does not create routing loop. In general, if the two running protocols have the concept of “internal” and “external” routes then routing loop will not occur. Routing protocol like RIP does not have these concept so it can create routing loop. But mutual redistribution on more than one routers may create suboptimal routing. In this lab to reach 10.10.7.0 R3 has to go through R2 -> R6 -> R5 which is not the best path. The suboptimal path is depended on which router advertises that prefix first.
You can download the final configuration file here: http://www.rstut.com/download/route_map_distribute_list_redistribute_final_config.zip.
good post .does anyone passed v5 lab
The network address between R5 and R7 is 10.10.57.0. Where is 10.10.7.0 coming from?
I have got this question in ccie v4 lab …but more tricky … we have to route “optimal” and no AD modification was allowed. I believe the worst part of CCIE LAB is redistribution… always corner cases
helloy guys anyone of you is using web iou?
Best material do study for CCIE LAB and Writen exam:
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🙂
I’m using Packet Tracer and a routing loop was created in my network when mutual redistribution was setup on R2 & R3. R2 and R3 both learned the route to 10.10.7.0 from each other as an External OSPF route with an AD of 110.
why not R3-R5-R2??
typo! why not through from R3-R5-R7?
Why I cannot see CCIE written exam share experience on this website any longer?
hi, nice topology.. to recall OSPF check below..
http://ipcisco.com/single-area-ospf-configuration/
I had good time practising this lab, its awesome.
more labs pls
Hello gents,
how to get those files 192Q or Spoto to pass the CCIE WRITTEN EXAM.
Thank you
https://drive.google.com/drive/folders/0B-ob6L_QjGLpfnRCUEFYcEhWZUw3OGNQY2FUSkptUXBrZDVzeE8zdkJQUERtOUFINDBFQW8
Hello Guys,
does anyone have CCIE r&s latest lab solutions, with gz files…i tried to download from above url but that url is not working properly..
Please share the correct url
CCIE Sp lab and written
100% pass
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CCIE Sp lab and written
100% pass
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CCIE LAB 1 And 2 £800
Hello Future CCIE,
someone have tried the SPOTO materials for LAB Preparation??
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Hi guys, are this tut LAB practices any similar to the real exam? or are they actually part of the exam?
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Hi Julia
please can you share with me, I am face a predicament. I have to recertify and I have been having issues locating them. please please
khudu121atgmail.com
Hi, is this topology real exam topology?
If so, from me, an EIGRP example too
http://ipcisco.com/eigrp-configuration-with-packet-tracer/
EVE Comm Edition Reloaded version (updated to 2.0.84)
with pre-loaded Cisco ISO file which was used in web iou
now added 2 labs for practice more coming soon.
L2-ADVENTERPRISEK9-M-15.1A.bin
L3-ADVENTERPRISEK9-M-15.2.M1.bin
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Hidden Content
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IOU
https://drive.google.com/file/d/1icm9PGcaDdGnJuAG5b1bI327W-Pyyqj1/view?usp=sharing
hello guys can you please share with me the latest dumps?I am writing my exam very soon.
Hello everyone,
I am practicing for the LAB exam using eve-ng community edition.
The images that I have don’t have most of the commands enabled
does anyone have a valid ios images that works with dynamips?
Kindly share.
W ww.cci
edumps.xyz?utm_source=bbs&utm_medium=bbs
I just passed the CCIE200-101 exam last week. I bought the topic here. The topic is true and effective. I have practiced most of the exam questions, but you have to remember the answer. You can’t just remember it. The options, I have encountered several questions in it, the options for the correct answer have been changed.
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Very useful. Thanks for your sharing
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just passed the exam.
thx passhot dot com
Congratulations!!!
Hi guys
I went to the exam yesterday and it was successful!
Section 2: Layer 3 Technologies
Section-2.1: OSPF in HQ
Configure the headquarters network (BGP AS#65003) as per the following requirements:
● Both gateway routers of the headquarters network must always advertise a default
route into the OSPF domain.
● All four devices produce the exact same output as shown below. Everything must
match, except the “Dead Time” counters and line order.
Section 2.2: OSPF in DC#1
In order to speed up OSPF convergence in the datacenter#1 network, limit the number of IP prefixes that carried in OSPF LSAs that OSPF is pre-configured in all required devices in datacenter #1.
Configure datacenter#1 network as the following requirements:
● All OSPF devices must exclude the IP prefixes of connected networks when
advertising their type 1 router LSA, except for prefixes associated with the loopbacks
or passive interfaces.
● All host loopbacks are the only OSPF Intra-area prefixes that may appear in any DC device’s routing table.
● Your solution must still apply if any new interface was added to the OSPF domain.
● Do not use any prefix-list or other explicit filter anywhere.
● Do not configure any interface as unnumbered.
● Do not remove any pre-configuration.
Cisco will change in 2020, the guys who want to take the exam should hurry.
So go to the exam as soon as possible!
Good luck!
P:pass
H:hot
I used the dump of the PH to pass the exam.
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Check out the iou
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Check out the iou
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Hi guys download the RnS v5 IOU
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Hi guys download the RnS v5 IOU
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Thanks buddy for sharing it ?
@cain
the link you have posted on June 29th, 2019 are not working
koris you can visit the mentioned website and download all the iou you required.
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mega link for VM (CCIE R&Sv5 ALL Labs Loaded )
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@cain , thanks for sharing , pls share the rest other wb also if you have.
Hie,
anybody with lab 2 solution pls share
hello . can i ask something regarding ccie lab exam .
Is it allowed to use # show run ,” tab” and “?”
Yes : show run command is allowed in exam and also ? is allowed