Consecuencias de la mala
configuración de la distancia administrativa
Fecha: 13/9/2012 Clase: Exploration 2 (CCNA 2) módulo
4
Escenario
Se trata de investigar las consecuencias de la mala
configuración de la distancia administrativa
(AD) en un escenario multi protocolo (RIP e EIGRP) y
evaluar cual es el protocolo elegido
para agregarse a la tabla de enrutamiento y sus
consecuencias.
Se asume mala praxis del administrador de los equipos
para llegar a esta situación.
Este escenario se simuló en Packet Tracer
Escenario disponible en: ftp://ftp.vilarrasa.com.ar/ (user y
pass: ccna)
Router_1#sh ip prot (verificamos configuración)
Routing Protocol is
"eigrp 100 "
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 100
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
10.0.0.0/30 (sólo EIGRP)
192.168.1.0
192.168.0.0
Routing Information Sources:
Gateway
Distance Last Update
10.0.0.2 100 781046
Distance: internal 100 external 170
Routing Protocol is
"rip"
Sending updates every 30
seconds, next due in 9 seconds
Invalid after 180 seconds,
hold down 180, flushed after 240
Outgoing update filter
list for all interfaces is not set
Incoming update filter
list for all interfaces is not set
Redistributing: rip
Default version control:
send version 1, receive any version
Interface
Send Recv Triggered RIP Key-chain
Automatic network
summarization is in effect
Maximum path: 4
Routing for Networks:
192.168.0.0
192.168.1.0
Passive Interface(s):
FastEthernet0/0
Routing Information
Sources:
Gateway
Distance Last Update
192.168.1.2
100 00:03:59
10.0.0.2
100 00:04:25
Distance: 100
(default is 120)
Router 1#
Router_2#sh ip prot (verificamos configuración)
Routing Protocol is
"eigrp 100 "
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 100
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
10.0.0.0/30 (sólo EIGRP)
192.168.3.0
192.168.1.0
Routing Information Sources:
Gateway
Distance Last Update
10.0.0.1 100 1519656
Distance: internal 100 external 170
Routing Protocol is
"rip"
Sending updates every 30
seconds, next due in 19 seconds
Invalid after 180 seconds,
hold down 180, flushed after 240
Outgoing update filter
list for all interfaces is not set
Incoming update filter
list for all interfaces is not set
Redistributing: rip,
static
Default version control:
send version 1, receive any version
Interface
Send Recv Triggered RIP Key-chain
FastEthernet0/0 1 2 1
Automatic network
summarization is in effect
Maximum path: 4
Routing for Networks:
192.168.1.0
192.168.3.0
Passive Interface(s):
Routing Information
Sources:
Gateway
Distance Last Update
192.168.1.1
100 00:04:21
10.0.0.1
100 00:04:49
Distance: 100
(default is 120)
Router_2#
Router_1#sh ip route (verificamos)
---resumido---
Gateway of last resort is
192.168.1.2 to network 0.0.0.0
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected,
Serial0/0/1
C 192.168.0.0/24 is directly connected,
FastEthernet0/0
D 192.168.3.0/24 [100/2172416] via 10.0.0.2,
00:04:38, Serial0/0/1
R* 0.0.0.0/0 [120/5] via 192.168.1.2,
00:00:19, Serial0/0/0
Router_1#
Router_2#sh ip route (verificamos)
---resumido---
Gateway of last resort is
0.0.0.0 to network 0.0.0.0
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected,
Serial0/0/1
D 192.168.0.0/24 [100/2172416] via 10.0.0.1,
00:03:52, Serial0/0/1
C 192.168.3.0/24 is directly connected,
FastEthernet0/0
C 192.168.4.0/24 is directly connected,
Serial0/1/0
S* 0.0.0.0/0 is directly connected,
Serial0/1/0
Router_2#
Agregamos enlace (tanto RIP como EIGRP)
%LINK-5-CHANGED: Interface
Serial0/0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial0/0/0, changed state to up
%DUAL-5-NBRCHANGE:
IP-EIGRP 100: Neighbor 192.168.1.2 (Serial0/0/0) is up: new adjacency
Router_1#sh ip route (verificamos, ver métrica RIP mas baja que EIGRP)
---resumido---
Gateway of last resort is
192.168.1.2 to network 0.0.0.0
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected,
Serial0/0/1
C 192.168.0.0/24 is directly connected,
FastEthernet0/0
C 192.168.1.0/24 is directly connected,
Serial0/0/0
R 192.168.3.0/24 [100/1]
via 192.168.1.2, 00:00:05, Serial0/0/0
R* 0.0.0.0/0 [120/5] via 192.168.1.2,
00:00:19, Serial0/0/0
Router_1#
Configuramos AD RIP por defecto
Router_2#conf t
Router_2(config)#router
rip
Router_2(config-router)#no
distance 100 (volvemos a 120)
Router_2(config-router)#^Z
Router_2#
Router_1#conf t
Router_1(config)#router
rip
Router_1(config-router)#no
distance 100 (volvemos a 120)
Router_1(config-router)#^Z
Router_1#
Router_1#sh ip route (verificamos, ver métrica mas alta que RIP, pero gana por AD
baja)
---resumido---
Gateway of last resort is
192.168.1.2 to network 0.0.0.0
10.0.0.0/30 is subnetted, 1 subnets
C 10.0.0.0 is directly connected,
Serial0/0/1
C 192.168.0.0/24 is directly connected,
FastEthernet0/0
C 192.168.1.0/24 is directly connected,
Serial0/0/0
D 192.168.3.0/24 [100/2172416]
via 10.0.0.2, 00:17:23, Serial0/0/1
[100/2172416] via 192.168.1.2, 00:08:09,
Serial0/0/0
R* 0.0.0.0/0 [120/5] via 192.168.1.2,
00:00:19, Serial0/0/0 (sólo vía RIP)
Router_1#
Configuraciones de equipos
Router_1#sh runn
Building configuration...
---resumido---
!
hostname Router_1
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
!
interface Serial0/0/0
ip address 192.168.1.1 255.255.255.0
clock rate 4000000
!
interface Serial0/0/1
ip address 10.0.0.1 255.255.255.252
clock rate 4000000
!
router eigrp 100
distance eigrp 100 170
network 10.0.0.0 0.0.0.3
network 192.168.1.0
network 192.168.0.0
no auto-summary
!
router rip
passive-interface FastEthernet0/0
network 192.168.0.0
network 192.168.1.0
distance 100
!
ip classless
!
end
Router_2#sh runn
---resumido---
!
hostname Router_2
!
interface FastEthernet0/0
ip address 192.168.3.1 255.255.255.0
!
interface Serial0/0/0
ip address 192.168.1.2 255.255.255.0
!
interface Serial0/0/1
ip address 10.0.0.2 255.255.255.252
!
interface Serial0/1/0
ip address 192.168.4.1 255.255.255.0
!
router eigrp 100
distance eigrp 100 170
network 10.0.0.0 0.0.0.3
network 192.168.3.0
network 192.168.1.0
no auto-summary
!
router rip
redistribute static metric 5
network 192.168.1.0
network 192.168.3.0
distance 100
!
ip classless
ip route 0.0.0.0 0.0.0.0
Serial0/1/0
!
end
(2012) Networking
for hard times
Rosario, Argentina