EIGRP is an advanced distance vector routing protocol created by Cisco that uses the Diffusing Update Algorithm to calculate paths and backup paths. It establishes neighbor adjacencies, uses reliable transport for packet delivery, and sends partial and bounded updates only when there are changes.

1. EIGRP
Juan Zambrano
CCNA/NSE4/F5 CA
Juan Zambrano Burgos
Network Engineer
Juan.zambrano@outlook.com

2. EIGRP
Enhanced Interior Gateway Routing es un protocolo de enrutamiento creado
por Cisco. Es llamado Hibrido o Vector distancia avanzado.
 Released in 1992 as a Cisco proprietary protocol.
 2013 basic functionality of EIGRP released as an open standard.
 Advanced Distance Vector routing protocol.
 Uses the Diffusing Update Algorithm (DUAL) to calculate paths and back-up paths.
 Establishes Neighbor Adjacencies.
 Uses the Reliable Transport Protocol to provide delivery of EIGRP packets to neighbors.
 Partial and Bounded Updates. Send updates only when there is a change and only to the
routers that need the information.
 Supports Equal and Unequal Cost Load Balancing.

3. EIGRP Packet Types

4. EIGRP Hello Packets
Used to discover EIGRP neighbors.
Used to form and maintain EIGRP neighbor adjacencies.
Sent as IPv4 or IPv6 multicasts.
IPv4 multicast address 224.0.0.10.
IPv6 multicast address FF02::A.
Sent every 5 seconds (every 60 seconds on low-speed NBMA
networks).
EIGRP uses a default Hold timer of three times the Hello interval
before declaring neighbor unreachable.

5. EIGRP Update & Acknowledgement Packets
Update packets are sent to
propagate routing information,
only when necessary.
Sends Partial updates – only
contains information about route
changes.
Sends Bounded updates-sent
only to routers affected by the
change.
Updates use reliable delivery,
therefore, require an
acknowledgement.

6. EIGRP Query and Reply Packets
Used when searching for networks.
Queries use reliable delivery, which can be multicast or unicast.
Replies use reliable delivery.

7. EIGRP
Tablas de EIGRP
 Utiliza Hellos para generar
adyacencia con sus vecinos.
(Neighbor table).
 Cuando ya establece adyacencia,
intercambia información de
enrutamiento con sus vecinos
(Topology Table).
 El mejor camino es copiado a la
tabla de enrutamiento. (Routing
Table)

8. EIGRP Neighbor Adjacency

9. EIGRP Topology Table

10. EIGRP Convergence
Convergence – All routers have the correct, most up-to-date information
about the network.

11. EIGRP
Topology Table.
Contiene la información de todos los
caminos posibles a través de EIGRP.
Para seleccionar el mejor camino,
Eigrp define los siguientes términos:
 Advertised Distance: Distancia
Anunciada por mi vecino hacia el
destino.
 Feasible Distance: Distancia total
hasta el destino.
 Succesor: Mejor camino hacia el
destino.
 Feasible Succesor: Camino Backup.
Regla:
Advertised distance of feasible successor < Feasible distance of successor.

12. EIGRP
Topology Table.
Contiene la información de todos los
caminos posibles a través de EIGRP.
Para seleccionar el mejor camino,
Eigrp define los siguientes términos:
 Advertised Distance: Distancia
Anunciada por mi vecino hacia el
destino.
 Feasible Distance: Distancia total
hasta el destino.
 Succesor: Mejor camino hacia el
destino.
 Feasible Succesor: Camino Backup.
Regla:
Advertised distance of feasible successor < Feasible distance of successor.

13. EIGRP
Métricas de Eigrp
Para el calculo de la métrica utiliza los siguientes valores K:
 Banwidth
 Delay
 Load
 Reliability
Adyacencia entre vecinos
Para formar adyacencia entre vecinos con EIGRP los siguientes valores deben ser iguales:
 El Sistema Autónomo en ambos debe ser el mismo
 Interfaces deben estar dentro del mismo segmento de red
 Las interfaces no deben estar como pasivas
 Los valores K de la métrica deben ser iguales
 La Autenticación debe ser aceptada (En caso de exista)
Por defecto se solo vienen habilitados el
Bandwidth y el Delay.

14. Configuración
Comandos:
R1(config)#router eigrp 1 <1-65535> Autonomous system number
R1(config-router)#network 192.168.12.0 0.0.0.255 <Red Wildcard>
R1(config-router)#network 192.168.13.0 0.0.0.255
R1(config-router)#network 192.168.16.0 0.0.0.255
R1(config-router)#passive-interface loopback 0 <Interface>
R1(config-router)#no auto-summary <Deshabilita sumarización auto>
 The router eigrp autonomous-system command
enables the EIGRP process.
 The autonomous system number is only significant to the EIGRP
routing domain.
 The EIGRP autonomous system number is not associated with the
Internet Assigned Numbers Authority (IANA) globally assigned
autonomous system numbers used by external routing protocols

15. Verificación
R1#show ip protocols
Routing Protocol is "eigrp 1 "
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 1
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
192.168.12.0
192.168.13.0
192.168.16.0
Passive Interface(s):
Loopback0
Routing Information Sources:
Gateway Distance Last Update
192.168.13.3 90 169559657
192.168.16.6 90 169618418
192.168.12.2 90 169663419
Distance: internal 90 external 170

16. Verificación
R1#show ip eigrp topology
IP-EIGRP Topology Table for AS 1/ID(10.1.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - Reply status
P 10.2.2.0/24, 1 successors, FD is 2297856
via 192.168.12.2 (2297856/128256), Serial0/0/0
via 192.168.13.3 (2300416/156160), Serial0/0/1
P 10.3.3.0/24, 1 successors, FD is 2297856
via 192.168.13.3 (2297856/128256), Serial0/0/1
via 192.168.12.2 (2300416/156160), Serial0/0/0
P 10.6.6.0/24, 1 successors, FD is 156160
via 192.168.16.6 (156160/128256), FastEthernet0/0
P 192.168.12.0/24, 1 successors, FD is 2169856
via Connected, Serial0/0/0
P 192.168.13.0/24, 1 successors, FD is 2169856
via Connected, Serial0/0/1
P 192.168.16.0/24, 1 successors, FD is 28160
via Connected, FastEthernet0/0
P 192.168.123.0/24, 2 successors, FD is 2172416
via 192.168.13.3 (2172416/28160), Serial0/0/1
via 192.168.12.2 (2172416/28160), Serial0/0/0

17. Verificación
R1#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
10.0.0.0/24 is subnetted, 4 subnets
C 10.1.1.0 is directly connected, Loopback0
D 10.2.2.0 [90/2297856] via 192.168.12.2, 00:09:03, Serial0/0/0
D 10.3.3.0 [90/2297856] via 192.168.13.3, 00:10:19, Serial0/0/1
D 10.6.6.0 [90/156160] via 192.168.16.6, 00:09:29, FastEthernet0/0
C 192.168.12.0/24 is directly connected, Serial0/0/0
C 192.168.13.0/24 is directly connected, Serial0/0/1
C 192.168.16.0/24 is directly connected, FastEthernet0/0
D 192.168.123.0/24 [90/2172416] via 192.168.13.3, 00:10:19, Serial0/0/1
[90/2172416] via 192.168.12.2, 00:08:52, Serial0/0/0

18. Verificación
Router#show ip eigrp neighbors

19. LAB1. EIGRP
Instrucciones:
- Abrir archivo LAB1 EIGRP.doc
- Responder las 4 preguntas
asociadas a cada uno de los
archivos PKT que se
encuentran en la guía.