Lab.6 Troubleshoot EIGRP 1

First Time Troubleshoting EIGRP Lab it's Going To Be Fun In This Troubleshooting

So This is the Topology : 

The Purpose is simple just to connect all router so all router can get information from all router 😄☺😃 also in R1 there are 2 loopback interface we must make 2 of them can parsing data with all router too

I have configured this topology like this :

R1 :

interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback2
 ip address 11.11.11.3 255.255.255.254
!
interface FastEthernet0/0
 ip address 12.12.12.1 255.255.255.0
 duplex auto
 speed auto
!
router eigrp 10
 network 1.0.0.0
 network 12.0.0.0
 no auto-summary

R2 :

interface FastEthernet0/0
 ip address 12.12.12.2 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 23.23.23.10 255.255.255.252
 duplex auto
 speed auto
!
router eigrp 10
 network 12.0.0.0
 network 23.0.0.0
 no auto-summary

R3 :

interface FastEthernet0/0
 ip address 23.23.23.9 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 34.34.34.30 255.255.255.192
 duplex auto
 speed auto
!
router eigrp 10
 network 23.0.0.0
 network 34.0.0.0
 no auto-summary

R4 :

interface FastEthernet0/0
 ip address 34.34.34.29 255.255.255.192
 duplex auto
 speed auto
!
router eigrp 10
 network 34.0.0.0
 no auto-summary

By the configuration that have made before there is a big mistake of making the EIGRP topology and that mistake is just wrong putting the network that we want to advertise it so if we want to make ALL router and loopback can communicate each other

we have to put the netmask of the network but in this EIGRP configuration we have to put the Wildcard

and what is Wildcard,A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, they are used in several places, for example:

List of Wildcard Mask

Slash	Netmask	Wildcard Mask
/30	255.255.255.252	0.0.0.3
/29	255.255.255.248	0.0.0.7
/28	255.255.255.240	0.0.0.15
/27	255.255.255.224	0.0.0.31
/26	255.255.255.192	0.0.0.63
/25	255.255.255.128	0.0.0.127
/24	255.255.255.0	0.0.0.255
/23	255.255.254.0	0.0.1.255
/22	255.255.252.0	0.0.3.255
/21	255.255.248.0	0.0.7.255
/20	255.255.240.0	0.0.15.255
/19	255.255.224.0	0.0.31.255
/18	255.255.192.0	0.0.63.255
/17	255.255.128.0	0.0.127.255
/16	255.255.0.0	0.0.255.255
/15	255.254.0.0	0.1.255.255
/14	255.252.0.0	0.3.255.255
/13	255.248.0.0	0.7.255.255
/12	255.240.0.0	0.15.255.255
/11	255.224.0.0	0.31.255.255
/10	255.192.0.0	0.63.255.255
/9	255.128.0.0	0.127.255.255
/8	255.0.0.0	0.255.255.255
/7	254.0.0.0	1.255.255.255
/6	252.0.0.0	3.255.255.255
/5	248.0.0.0	7.255.255.255
/4	240.0.0.0	15.255.255.255
/3	224.0.0.0	31.255.255.255
/2	192.0.0.0	63.255.255.255
/1	128.0.0.0	127.255.255.255

And here are the true configuration for this topology :
R1 :

interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback2
 ip address 11.11.11.3 255.255.255.254
!
interface FastEthernet0/0
 ip address 12.12.12.1 255.255.255.0
 duplex auto
 speed auto
!
router eigrp 10
 network 1.1.1.1 0.0.0.0
 network 11.11.11.2 0.0.0.1
 network 12.12.12.0 0.0.0.255
 no auto-summary

R2 :

interface FastEthernet0/0
 ip address 12.12.12.2 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 23.23.23.10 255.255.255.252
 duplex auto
 speed auto
!
router eigrp 10
 network 12.12.12.0 0.0.0.3
 network 23.23.23.8 0.0.0.3
 no auto-summary

R3 :

interface FastEthernet0/0
 ip address 23.23.23.9 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 34.34.34.30 255.255.255.192
 duplex auto
 speed auto
!
router eigrp 10
 network 23.23.23.8 0.0.0.3
 network 34.34.34.0 0.0.0.63
 no auto-summary

R4 :

interface FastEthernet0/0
 ip address 34.34.34.29 255.255.255.192
 duplex auto
 speed auto
!
router eigrp 10
 network 34.34.34.0 0.0.0.63
 no auto-summary

After so much changing configuration finally we have done configure the EIGRP Troubleshooting you can test it by yourself and i'm going to give you the Lab you can lab this topology this one i have configured so you may see the configuration or delete the configuration to try this troubleshooting again

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