Configuring EIGRP

CCNP Route labs. EIGRP Basic Configuration

EIGRP Basic Configuration -Charter 7 -Study Guide for CCNP Route



  1. :
     Configure EIGRP for the shown network using EIGRP AS 90. Corporate policy dictates that you must use specific wildcard masks on R2 and R3. In addition, EIGRP should be configured in such a way that it does not operate like a classful routing protocol. Finally, the BB router has a static route to; R2 and R3 should receive this route via EIGRP without using redistribution

  2.  R2 and R3 should have a default route pointing to the network at the corporate office. No static routes can be used to accomplish this.

  3.  In order to meet security standards, EIGRP should not form neighbor relationships on any interface where other EIGRP routers do not exist.

  4.  To improve the efficiency of the remote routers R2 and R3, the corporate BB router should summarize – into a single network advertisement.
  5.  To best utilize available network bandwidth, the corporate BB router should perform unequal load balancing to reach the network.

Exercise #5 CBT nuggets, CCNP Route     




         Paragraph #1

Configuration BB

Start  , enable, conf t
Asignation of the ip of each interface on R1
interface  Loopback2
ip address

interface  Loopback3
ip address
interface  Loopback4
ip address
interface  Loopback5
ip address
interface  Loopback6
ip address
interface  Loopback7
ip address
interface  Loopback8
ip address
interface  Loopback0
ip address
interface  Loopback1
ip address
Interface Serial0/0
Description Connection al R2
Bandwidth 128
Ip address    ( el “252”  viene del subneting del /30)
No shut

Interface Serial0/1
Description Connection al R3
Bandwidth 256
Ip address    ( el “252”  viene del subneting del /30)
No shut

Exit, exit
Verification of IP and conection to R1
Show ip interface  brief  
Bb#conf t
BB(config)#router eigrp 90 That number 90 is the Autonomus system and must be in all the router)
BB(config-router) #network
#No auto  ( para que no halla auto-summary)

 ( explicacion: es class B, y es el subnet mask…lo que estamos hacienda son 2 cosas:  A)sending hellos    a los ultimos 255.255 pues  que sean cualquiera.. no nos importa..
B)Advertising  to R2 y R3
We need to enable our SERIAL interfaces in R1
#BB(config-router)#  crtl y “z”
#BB (config-router)#network
#BB (config-router)# network  ( no mencionado hasta el min. 20
No auto-summary
Ip default-network                                           ( to connect statically)
Ip route null0

# show ip protocols

(Vemos que hay eigrp 90,   y que esta routing estos networks: y  el default network que no tiene /16)
Configuration of R2
Asigning the ip to the interfaces
Enable  Conf t, Hostname
Interface Serial0/0
Description Coneccion al BB
Bandwidth 128
Ip address
No shut

Interface f0/1
Description Conneccion al Switch1
Ip address
No shut 
  No auto-summary              (Nota: leer bien en la consola como esta escrito f 1/0, f 0/0, f 0/1)

Interface FastEthernet0/0
Description Conneccion al Switch2
Ip address
No shut

(Nota : 1.- ir al cuadrito de show interfaces en GNS3 que parece una paleta
            2.- despues vamos a darle un enable  de eigrp)
R2#conf t
R2(config) #router eigrp 90
R2((config-router)#do show run int fa0/0             (para ver cual es el IP especifico del fa0/0)
no auto                                          ( para que no halla auto-summary, se aplica no a los IP  no a los network)
ctrl Z
#show IP route                                                           ( para  aver las connecciones)
#Show ip eigrp neighbors     `               ( par aver la situacion de la conneccion, hasta ahora solo BB)

Explicacion de terminos de  show IP eigrp neighbors

H Handle:    The order that you have neighbors: 0 is the first neighbor
Holdtime  The order when you consider your neighbor dead ( never below 10 secs because it would               mean  you missing  hellos
SRTT :  source round trip timer ( hopw long  does it take  to get it the re and back in MS

RTO  Retrasmited time out

Q:    How many packets are in queued waiting to be send, if there is anything above 0, means the is a problem  with the bandwidth, , or a link problem
Seq Number :  La version de la base de dato que esta corriendo

Configuracion del R3

Enable, conf t y hostname R3
Interface s0/0
Description coneccion al BB
Bandwidth 256
Ip address
No shut

Interface f0/0
Description Coneccion al SW1
Ip address
No shut

Router eigrp 90
No auto-summary

#do show ip  int brief
#show ip eigrp neighbors
#show ip route
We see the  BB  and we checked that BB learned about the different routes:
BB#show ip routes
We can see that if connects to SW2  (  and using because is the fastest  bandwidth connection)
An important command: BB#show ip eigrp topology      (17:49:mins.)
-It will show one successor : the less FD ( feasible distance) :
-It will show the slower : feasible successor, the back up
Second Paragraph
We verify the information’s  in show IP routes   in r2 if it’s receiving the static route of of BB
The second  paragraph explain the ip default-network for,  , when it’s marked in BB with “*” means that it’s the candidate for statid route , but when you go to R2  it’s the designated static route.You can see that in #show ip routes
Third Paragraph
On R2 we need to id the interface, so we don’t want to say  hello but  advertise to other neighbors:
#show ip int brief   ( we see it’s    =   f0/1)
#router eigrp 90
#passive-interface default     
No passive-interface s0/0
No passive-interface s0/1
No auto-summary
We confirm at “section” eigrp :  r2#show run | s eigrp

Paragraph 4
From 0 till 7 are 8  numbers..
16  ( 15 numbers would be too much)  4 3 numbers would be too small
From 8   we go to 128,64,32,16, 8, 4,2 ,1…the 8 number would be the fifth in that order  128,192,224,240,248…   it means 248
             A.-in BB#router eigrp 90
BB#int s0/0
BB#(configif)#ip summary-address eigrp 90

            B.-Now go to R2   
R2(config-router)#do show ip route
It’s different because it got ( /21)  , that mean 8+8+5.. Belove it’s where he is learning the route, it says serial and got the double of F.D.

           C.-We found out that we need to configure in BOTH SERIAL interfaces of BB
BB(config-if)#int s0/1
BB(config-if)#ip)#ip summary-address eigrp 90

      D.-Them we go to R2 and check on  R2#show IP route  and them R3
Paragraph 5

In BB#show ip eigrp topology         We see that is faster that

BB#(config)router eigrp 90
BB( config-router)variance2
 Crtl –z
BB#show IP eigrp topoly
Now you will see two path using A.S. 90 to &and did load balancing to  to as well


I hope this  page would be informative..This is basically for study purpose..
For any questions, please let me know at
Configuring EIGRP Configuring EIGRP Reviewed by victor melo on 11:34 AM Rating: 5

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