Scenario:
At your job, you’ve recently installed a new serial link to a neighboring site to perform equal-cost load balancing with EIGRP. However, your boss refuses to issue you another IP network for this link, and he forbids you to variably subnet the existing network. Can you make it work?
Goal:
- Nothing has been preconfigured for you!
- Make the proper physical connections as outlined in the diagram.
- Configure 1.1.1.1/32 as a loopback on R1.
- Configure 2.2.2.2/32 as a loopback on R2.
- Using only the 192.168.12.0/24, assign an IP address to all (4) serial interfaces in use, establish an EIGRP neighborship on each link, and ensure traffic is load balanced between router loopback addresses. These tasks can be performed in any order.
IOS:
c3725-adventerprisek9-mz.124-7.image
Topology:
Do you want your CCNA or CCNP Certificate?
The How to Master series helps you to understand complex topics like spanning-tree, VLANs, trunks, OSPF, EIGRP, BGP and more.
Written by René Molenaar - CCIE #41726
This must be done on GNS3 as packet tracer does not seem to support this lab.
how in the world did I not receive an Overlap error message?
any one can tell us why there arent any error msg , note if you make configuration step by step you will find the error is appeared but after i configure the eigrp is working fine and the
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/2297856] via 192.168.12.3, 00:03:52, Serial0/1
[90/2297856] via 192.168.12.1, 00:03:52, Serial0/0
how is working ????????!!!
if you traceroute from one loopback to another one.you give an error message.hehe
Can someone explain why this is working, and not getting an overlap error when assigning 192.168.12.1/24 and 192.168.12.2/24 on the same router to 2 serial interfaces?
You will need to bind the interfaces together using ppp multilink. Then, you will be able to assign the multilink interface the IP address.
why the attached file which contain the topology on gns3 didn’t open although i have the ios to open this file
the following message appears each time i am trying to open the file :
ios can not be found for this hypervisor 170.0.0.1:7200
so where is the problem
[size=large][b]you should give one interface serial 0/0 an IP Address in the subnet 192.168.12.0/24 and make the other interface in the same router inherit the first interface ip through the command –(ip unnumbered serial 0/0) and make the same on the other router
then make EIGRP and advertise the networks [/b][/size]
You can also make this through Multilink
You all have good ideas, but this is NOT a multilink problem, nor it is an unnumbered problem.
The key is in the “order of operations”. Try configuring something else first … before you configure interface IP addresses.
Each interface must have a different IP address. For example 12.1, 12.2, 12.3, and 12.4.
That rules out IP unnumbered and MLPPP.
I did this lab and used ppp multilink. To put two addresses from the same subnet on two different interfaces on the same router goes against everything I have learned thus far. Can anyone please explain how both serial interfaces can be assigned different addresses from the same subnet? Wow… just did it again:
Gateway of last resort is not set
C 192.168.12.0/24 is directly connected, Serial1/0
is directly connected, Serial1/1
Cisco never ceases to amaze…
have you a video solution, pls?
Solution to above Lab:
=================
on R1
en
conf t
!
int loopback 0
ip address 1.1.1.1 255.255.255.255
!
! create a virtual template and assign it an ip address that is to be assigned on s0/0 & s0/1
int virtual-template 1
ip address 192.168.12.1 255.255.255.0
!
int s0/0
ip unnumbered virtual-template 1
no shutdown
!
int s0/1
ip unnumbered virtual-template 1
no shutdown
!
router eigrp 1
no auto-summary
network 192.168.12.0
network 1.1.1.1 0.0.0.0
!
==================
on R2
en
conf t
!
int loopback 0
ip address 2.2.2.2 255.255.255.255
!
! create a virtual template and assign it an ip address that is to be assigned on s0/0 & s0/1
int virtual-template 1
ip address 192.168.12.2 255.255.255.0
!
int s0/0
ip unnumbered virtual-template 1
no shutdown
!
int s0/1
ip unnumbered virtual-template 1
no shutdown
!
router eigrp 1
no auto-summary
network 192.168.12.0
network 2.2.2.2 0.0.0.0
!
=====
! verify on both router R1 & R2 – for remote side loopback we have two path via s0/0 and s0/1
show ip route
Hope Nick this provides win-win solution to network admin & satisfy the boss.
There is nothing in the final config? I guess I need to create the topology manually?
i try to configure with gns3.
it work fine with overlap ip address on serial link also.
but i wonder is it applied on serial link only?
I think its a starightforward config.Serial connection is point to point and will be accepted,If you try this with ethernet there will be an overlap.
This guy has it right. From the Cisco IP routing Q&A:
Q. Is it possible to have duplicate ip addresses for two serial interfaces that belong to the same router?
A. Yes, duplicate ip addresses are allowed on serial interfaces. It is a more efficient way of bundling links together (ie. MLPPP) and also a better way to preserve address space. Change the encapsulation from the default HDLC to PPP in order to assign duplicate ip addresses.
source: [url=]http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a008012d8f7.shtml#qa15a[/url]
So in other words, Cisco allows different serial interfaces on a router to be configured in the same subnet.
That’s the solution to the IP addressing problem. I’m not as clear on how to fulfill the load balancing requirement. I assumed that the IOS would automatically load balance across the two serial interfaces, but Wireshark captures don’t bear that out. When I source pings from the loopback interface, it always uses the same serial interface to forward the pings to the other router.
[EDIT]
Ok, I think I got it. After reading up on this a bit, I found out that when Cisco Express Forwarding is enabled (the default on recent IOS versions), load balancing is done on a per-destination rather than a per-packet basis. Process switching load balances on a per-packet basis, which is what this lab calls for.
Sure enough, I issued the command “no ip cef” and my Wireshark captures showed that both links were being utilized when I did some test pings.
That said, I don’t feel really comfortable tinkering with low-level algorithms, so if someone can do this without turning off CEF I’d love to know.
[EDIT AGAIN]
To answer my own question, I did more research and found out that you can still use CEF and do per-packet load balancing if you issue the command “ip load-sharing per-packet” on all the serial interfaces.
In case anyone is wondering, these were my sources about CEF and load balancing:
[url=]http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186a00800afeb7.html[/url]
[url=]http://www.cisco.com/en/US/tech/tk827/tk831/technologies_tech_note09186a0080094806.shtml[/url]
Wow, this lab took me on quite an unexpected ride.
Excellent Explanation. Better than Google searching it!
Wonderfually explained !!! Thanks.
Proceed with simple steps.
create the topology
connect the two routers with serial interfaces as given
give ip addresses as you want. but within the network mentioned.
create loopbacks on each router.
and traceroute from a source of one router to the second one will prove that it is already loadbalanced, since there FD are the same.
for example on router 1
traceroute 2.2.2.2 source 1.1.1.1
The Config in this lab are incorrect assuming you want to ping the Loop back from each router.
This does not work:
router eigrp 1
passive-interface Loopback0
network 192.168.12.0
no auto-summary
you will not get an eigrp route
This does work:
router eigrp 1
passive-interface Loopback0
network 1.0.0.0
network 192.168.12.0
no auto-summary
However this is very bad form and a multilink bundle should be created like this
R1
interface Multilink1
Ip address 192.168.12.1
ppp multilink
ppp multilink group 1
no shut
interface Serial0/0
bandwidth 1536
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
interface Serial0/1
bandwidth 1536
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
the question asks to make sure each interface has an ip address. I take this to mean each interface needs its own ip address. This rules out multilink, unnumbered etc, etc.
Just use per packet load sharing. To test, clear counters and send an extended ping. Then go and check the counters for each interface. There will never be an exact 50/50 split but as logn as you are within a few packets you will know it is working.
All,
The solution is to configure the EIGRP network statement BEFORE configuring the IP addresses. I realize now that the final configs still put the routing processes after the interfaces, so no one could see the sequence. As I said above, the trick was in the order of operations. This is a very obscure feature, and I don’t think it even works across a reload. Have never deployed it in production.
router eigr p1
no auto
net 192.168.12.0
int s0/1
no sh
ip add 192.168.12.4 255.255.255.0
int s0/0
no sh
ip add 192.168.12.2 255.255.255.0
R2#sh ip eig ne
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.12.3 Se0/1 12 00:00:16 15 200 0 6
0 192.168.12.1 Se0/0 11 00:00:16 25 200 0 3
R2#sh ip ro co
C 192.168.12.0/24 is directly connected, Serial0/1
is directly connected, Serial0/0
Brilliantly done Nicholas Russo.
I guess when Rene mentioned in the question “These tasks can be performed in any order”, that was quite intuitive.
Brilliantly done Nicholas Russo.
I guess when Rene mentioned in the question “These tasks can be performed in any order”, that could have killed it.
Hi Nicholas,
I tried simulating your solution on GNS3 but the loopbacks are not pingable from either routers.The transit interfaces are pingable from both the routers.
Here is my config.
R1#sh run
Building configuration…
Current configuration : 1224 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
ip cef
ip tcp synwait-time 5
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.12.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.12.3 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 192.168.12.0
no auto-summary
!
!
!
no ip http server
no ip http secure-server
!
no cdp log mismatch duplex
!
!
!
!
!
control-plane
!
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
!
end
R2#sh run
Building configuration…
Current configuration : 1224 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
ip cef
ip tcp synwait-time 5
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.12.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.12.4 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 192.168.12.0
no auto-summary
!
!
!
no ip http server
no ip http secure-server
!
no cdp log mismatch duplex
!
!
!
!
!
control-plane
!
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
!
end
R1#sh ip eigrp n
IP-EIGRP neighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.12.2 Se1/0 12 00:23:23 125 750 0 6
0 192.168.12.4 Se1/1 10 00:23:28 93 558 0 3
R1#sh ip route
Codes: C – connected, S – static, 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
i – IS-IS, su – IS-IS summary, 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
C 192.168.12.0/24 is directly connected, Serial1/1
is directly connected, Serial1/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
R2#sh ip eigrp n
IP-EIGRP neighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.12.1 Se1/0 11 00:24:29 118 708 0 6
0 192.168.12.3 Se1/1 14 00:24:35 89 534 0 3
R2#sh ip ro
Codes: C – connected, S – static, 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
i – IS-IS, su – IS-IS summary, 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
C 192.168.12.0/24 is directly connected, Serial1/0
is directly connected, Serial1/1
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
R1#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
…..
Success rate is 0 percent (0/5)
Plz let me know the issue or if need any outputs.
Sorry for my earlier post.I failed to enable eigrp on my loopbacks. Now both are reachable.
what is the effect of making loop back interface passive?……………….how loop back helps to bundle links?
In EIGRP, by making an interface passive you are suppressing hello packets from being sent to that interface. In addition, it also suppresses routing updates from being sent out that interface.
passive-interface command will stop outgoing and incoming routing updates of loop back interface!!!! just clear that what is the role of loop back in this lab to create link bundling?
hi all,
please how to dowload this lab?
I might have done the subnetting wrong, but saw the lab as a load balance lab across serial interfaces and not a multilink. I had to change the CEF load balance method on the interfaces. My config is as:
R2#sho run
Building configuration…
Current configuration : 1263 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
logging buffered 20000 debugging
logging console notifications
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
!
!
ip cef
no ip domain lookup
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface Serial1/0
ip address 192.168.12.2 255.255.255.252
ip load-sharing per-packet
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.12.6 255.255.255.252
ip load-sharing per-packet
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 100
network 2.0.0.0
network 192.168.12.0
maximum-paths 2
no auto-summary
!
no ip http server
no ip http secure-server
!
!
!
access-list 100 deny eigrp any any
access-list 100 permit ip any any
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
!
end
This is not correct. The idea is to have both links show as connected routes. I believe I answered this in some earlier comments, do you see it?
Cool lab
Where is the video, I love watching these and following along
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Multilink1
ip address 192.168.12.1 255.255.255.0
ppp multilink
ppp multilink interleave
ppp multilink group 1
ppp multilink multiclass
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
no ip address
encapsulation ppp
serial restart-delay 0
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Serial1/1
no ip address
encapsulation ppp
serial restart-delay 0
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/4
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/5
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/6
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/7
no ip address
shutdown
serial restart-delay 0
!
router eigrp 1
network 1.1.1.1
network 192.168.12.0
no auto-summary
!
This is not the correct solution, scroll up in the comment chain and you will see it. The key is in the order of operations.
if you test with traceroute.you see your problem
ANSWER:
on R1
interface Serial0/0
ip address 192.168.12.1 255.255.255.0
ip load-sharing per-packet
!
interface Serial0/1
ip address 192.168.12.3 255.255.255.0
ip load-sharing per-packet
router eigrp 1
network 0.0.0.0
no auto-summary
on R2
interface Serial0/0
ip address 192.168.12.2 255.255.255.0
ip load-sharing per-packet
!
interface Serial0/1
ip address 192.168.12.4 255.255.255.0
ip load-sharing per-packet
router eigrp 1
network 0.0.0.0
no auto-summary
Note: either use: R2(config-if)#ip load-sharing per-packet or R2(config)#no ip cef
Not correct, please scroll up in the comments to see the correct solution.
@Nicholas : Your answer is correct but then packet will be load balanced per destination based.
We need R2(config-if)#ip load-sharing per-packet or R2(config)#no ip cef but load balancing per packet based.
OK, that is true. I wasn’t really aiming for that as an objective but if you read the instructions literally, you are correct.
My Configuration –
R1 :
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
memory-size iomem 5
ip cef
!
!
!
!
no ip domain lookup
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.12.1 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 192.168.12.5 255.255.255.252
clock rate 2000000
!
router eigrp 90
network 1.1.1.1 0.0.0.0
network 192.168.12.1 0.0.0.0
network 192.168.12.5 0.0.0.0
auto-summary
!
!
!
no ip http server
no ip http secure-server
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
!
end
R2
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
memory-size iomem 5
ip cef
!
!
!
!
no ip domain lookup
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.12.2 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 192.168.12.6 255.255.255.252
clock rate 2000000
!
router eigrp 90
network 2.2.2.2 0.0.0.0
network 192.168.12.2 0.0.0.0
network 192.168.12.6 0.0.0.0
auto-summary
!
!
!
no ip http server
no ip http secure-server
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
!
end
———————————————————————–
RESULTS:
R1 – Routing table:
192.168.12.0/24 is variably subnetted, 3 subnets, 2 masks
C 192.168.12.4/30 is directly connected, Serial0/1
C 192.168.12.0/30 is directly connected, Serial0/0
D 192.168.12.0/24 is a summary, 00:12:02, Null0
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 1.1.1.1/32 is directly connected, Loopback1
D 1.0.0.0/8 is a summary, 00:12:02, Null0
D 2.0.0.0/8 [90/2297856] via 192.168.12.6, 00:11:49, Serial0/1
[90/2297856] via 192.168.12.2, 00:11:49, Serial0/0
R2 Routing table :
192.168.12.0/24 is variably subnetted, 3 subnets, 2 masks
C 192.168.12.4/30 is directly connected, Serial0/1
C 192.168.12.0/30 is directly connected, Serial0/0
D 192.168.12.0/24 is a summary, 00:12:19, Null0
D 1.0.0.0/8 [90/2297856] via 192.168.12.5, 00:12:31, Serial0/1
[90/2297856] via 192.168.12.1, 00:12:31, Serial0/0
2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 2.2.2.2/32 is directly connected, Loopback1
D 2.0.0.0/8 is a summary, 00:12:20, Null0
————————————————————————————————-
Pls comment
My Configuration :
R1 :
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
memory-size iomem 5
ip cef
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.12.1 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 192.168.12.5 255.255.255.252
clock rate 2000000
!
router eigrp 90
network 1.1.1.1 0.0.0.0
network 192.168.12.1 0.0.0.0
network 192.168.12.5 0.0.0.0
no auto-summary
!
!
!
no ip http server
no ip http secure-server
control-plane
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
!
end
————————————————————————-
R2 :
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
memory-size iomem 5
ip cef
!
!
!
!
no ip domain lookup
!
!
interface Loopback1
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.12.2 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 192.168.12.6 255.255.255.252
clock rate 2000000
!
router eigrp 90
network 2.2.2.2 0.0.0.0
network 192.168.12.2 0.0.0.0
network 192.168.12.6 0.0.0.0
no auto-summary
!
!
!
no ip http server
no ip http secure-server
!
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
!
end
———————————————————————–
OUTPUT :
R1 routing table:
192.168.12.0/30 is subnetted, 2 subnets
C 192.168.12.4 is directly connected, Serial0/1
C 192.168.12.0 is directly connected, Serial0/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback1
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/2297856] via 192.168.12.6, 00:00:42, Serial0/1
[90/2297856] via 192.168.12.2, 00:00:42, Serial0/0
————————————————————————–
R2 routing table:
192.168.12.0/30 is subnetted, 2 subnets
C 192.168.12.4 is directly connected, Serial0/1
C 192.168.12.0 is directly connected, Serial0/0
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/2297856] via 192.168.12.5, 00:00:13, Serial0/1
[90/2297856] via 192.168.12.1, 00:00:13, Serial0/0
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback1
———————————————————————–
Pls comment 🙂
Not quite. Scroll up in the comments to see the correct configuration.
you must configure ip addressing with /24 prefix mask.
Hello, I just simply did that. It is working properly.
r1#Show ip ro
C 192.168.12.0/24 is directly connected, Serial0/0
is directly connected, Serial0/1
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/2297856] via 192.168.12.4, 00:36:25, Serial0/1
[90/2297856] via 192.168.12.3, 00:36:25, Serial0/0
D 192.168.1.0/24 [90/2681856] via 192.168.12.4, 00:35:26, Serial0/1
—————————————————————————————–
Hi Nick,
Is this right ?
R1# sh ip eigrp neigh
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.12.4 Se0/1 12 00:01:25 106 636 0 12
0 192.168.12.3 Se0/0 11 00:01:36 111 666 0 11
R1#
D 2.2.2.2 [90/2297856] via 192.168.12.4, 00:01:47, Serial0/1
[90/2297856] via 192.168.12.3, 00:01:47, Serial0/0
R1(config-router)#
Looks OK to me.
For GNS3 I need IOS that supports EIGRPv6, how can I get this?
Try 12.4(15)T
Now I have small query, not a query as such but more of a need of an analysis after the crime is solved.
How we are able to put the ip addresses of the same subnet on different ports of the network?
Does EIGRP does not detect the same?
And what did it mean by “Order of Operations issue” needed to solve this lab.
Could someone please clarify.
I really don’t have a great answer, but you must configure the EIGRP network statement before configuring the IP addresses.
Works perfectly for me.
R1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(100)/ID(1.1.1.1)
Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply,
r – reply Status, s – sia Status
P 192.168.12.0/24, 1 successors, FD is 2169856
via Connected, Serial1/0
via Connected, Serial1/1
P 2.2.2.2/32, 2 successors, FD is 2297856
via 192.168.12.2 (2297856/128256), Serial1/1
via 192.168.12.22 (2297856/128256), Serial1/0
P 1.1.1.1/32, 1 successors, FD is 128256
via Connected, Loopback1