Concept:
1. Neighbor table: The address of the direct-attached router and the interface to which it is connected
2. Topology table:
A. Routing Status: P (passive) a (activity)
B. Feasible distance (FD): Minimum metric to destination (metric)
C. Reporting distance (AD): The cost of a neighbor arriving at the destination network
D. Equivalent load balancing: Two link FD values at the same time as the agreed destination
E. Subsequent routing: a skip to the main route the router (R12 is the successor route of the R11)
F. Feasible successor routes: AD2<FD1, that is, a viable successor route, after the main routing failure, the feasible successor route immediately replaced
G. Non-row successor routes: AD2>FD1, when the main routing link fails, the route needs to be recalculated.
3. Routing table: shows only the best route in the top table, that is, the successor route
4. Order
Router EIGRP 100 100 is an autonomous domain system (AS) number
No auto-summery turn off automatic rollup
Network 192.168.1.254 0.0.0.0
Network interface IP Address wildcard character
.......
5. View Neighbor table, topology table, routing table
Show IP eigrp nei
Show IP eigrp topolopy
Show IP route
Experiment
1. Topology map
2. Configure
Show run on the R1
R1#show Run
Building configuration ...
Current configuration:745 bytes
!
Version 12.4
No service Timestamps log datetime msec
No service timestamps debug datetime msec
No service password-encryption
!
Hostname R1
!
!
!
No IP domain-lookup
!
!
Interface fastethernet0/0
IPAddress 172.16.12.1 255.255.255.0
Duplex Auto
Speed auto
!
Interface FASTETHERNET0/1
IPAddress 172.16.14.1 255.255.255.0
Duplex Auto
Speed auto
!
Interface ethernet1/0
IPAddress 10.10.1.254 255.255.255.0
Duplex Auto
Speed auto
!
Interface Vlan1
Noip Address
Shutdown
!
Router EIGRP 100
Network 10.10.1.254 0.0.0.0
Network 172.16.12.1 0.0.0.0
Network 172.16.14.1 0.0.0.0
Noauto-summary
!
IP classless
!
!
Line con 0
Exec-timeout 0 0
Logging synchronous
Line vty 0 4
Login
!
!
End
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Show run on the R2
R2#show Run
Building configuration ...
Current configuration:709 bytes
!
Version 12.4
No service Timestamps log datetime msec
No service timestamps debug datetime msec
No service password-encryption
!
Hostname R2
!
!
No IP domain-lookup
!
!!
Interface Loopback0
IPAddress 172.16.55.1 255.255.255.0
!
Interface fastethernet0/0
IPAddress 172.16.12.2 255.255.255.0
Duplex Auto
Speed auto
!
Interface FASTETHERNET0/1
IPAddress 172.16.23.2 255.255.255.0
Duplex Auto
Speed auto
!
Interface Vlan1
Noip Address
Shutdown
!
Router EIGRP 100
Network 172.16.12.0 0.0.0.255
Network 172.16.23.0 0.0.0.255
No auto-summary
!
IP classless
!
!
Line con 0
Exec-timeout 0 0
Logging synchronous
Line vty 0 4
Login
!
!
!
End
Show run on the R3
R2#show Run
Building configuration ...
Current configuration:709 bytes
!
Version 12.4
No service Timestamps log datetime msec
No service timestamps debug datetime msec
No service password-encryption
!
Hostname R2
!
!
No IP domain-lookup
!
!
Interface Loopback0
IPAddress 172.16.55.1 255.255.255.0
!
Interface fastethernet0/0
IPAddress 172.16.12.2 255.255.255.0
Duplex Auto
Speed auto
!
Interface FASTETHERNET0/1
IPAddress 172.16.23.2 255.255.255.0
Duplex Auto
Speed auto
!
Interface Vlan1
Noip Address
Shutdown
!
Router EIGRP 100
Network 172.16.12.0 0.0.0.255
Network 172.16.23.0 0.0.0.255
Network 172.16.0.0
Noauto-summary
!
IP classless
!
!
Line con 0
Exec-timeout 0 0
Logging synchronous
Line vty 0 4
Login
!
!
End
Show run on the R4
R4#show Run
Building configuration ...
Current configuration:625 bytes
!
Version 12.4
No service Timestamps log datetime msec
No service timestamps debug datetime msec
No service password-encryption
!
Hostname R4
!
!
No IP domain-lookup
!
!
Interface fastethernet0/0
IPAddress 172.16.14.4 255.255.255.0
Duplex Auto
Speed auto
!
Interface FASTETHERNET0/1