Cisco Redes

Ejercicio de redistribución y filtros

By Francisco Molina
Ejercicio de redistribución y filtros

Ejercicio de redistribución y filtros

En el siguiente ejercicio se configurará redistribución y filtros en routers CISCO con protocolo de enrutamiento EIGRP, OSPF y RIPv2.

La topología es la siguiente:

Ejercicio de redistribución y filtros

Objetivos:

  1. Lograr convergencia.
  2. Aplicar los siguientes filtros de redistribución:
    1. la ruta externa no debe ser conocida por RIP,
    2. el área 60 no debe ser conocida por EIGRP
    3. OSPF debe conocer las rutas L7 y L8 como E1, y
    4. la ruta L2 no debe ser conocida por RIP.

Configuración básica

ROUTER R1

R1#conf t

R1(config)#int s1/0
R1(config-if)#ip address 20.0.0.1 255.255.255.252
R1(config-if)#clock rate 128000
R1(config-if)#no shutdown
R1(config-if)#exit

R1(config)#int loopback 0
R1(config-if)#ip address 10.10.0.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit

R1(config)#int loopback 1
R1(config-if)#ip address 10.20.0.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit

R1(config)#int loopback 2
R1(config-if)#ip address 10.30.0.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit

ROUTER R2

R2#conf t

R2(config)#int s1/0
R2(config-if)#ip address 20.0.0.2 255.255.255.252
R2(config-if)#no shutdown
R2(config-if)#exit

R2(config)#int s1/1
R2(config-if)#ip address 20.0.0.5 255.255.255.252
R2(config-if)#clock rate 128000
R2(config-if)#no shutdown
R2(config-if)#exit

R2(config)#int loopback 200
R2(config-if)#ip address 200.2.2.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit

ROUTER R3

R3#conf t

R3(config)#int s1/1
R3(config-if)#ip address 20.0.0.6 255.255.255.252
R3(config-if)#no shutdown
R3(config-if)#exit

R3(config)#int s1/2
R3(config-if)#ip address 20.0.0.9 255.255.255.252
R3(config-if)#clock rate 128000
R3(config-if)#no shutdown
R3(config-if)#exit

R3(config)#int loopback 3
R3(config-if)#ip address 30.3.3.3 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#exit

R3(config)#int loopback 4
R3(config-if)#ip address 60.1.1.1 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#exit

R3(config)#int loopback 5
R3(config-if)#ip address 60.1.2.1 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#exit

R3(config)#int loopback 6
R3(config-if)#ip address 60.1.3.1 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#exit

ROUTER R4

R4#conf t

R4(config)#int s1/2
R4(config-if)#ip address 20.0.0.10 255.255.255.252
R4(config-if)#no shutdown
R4(config-if)#exit

R4(config)#int loopback 7
R4(config-if)#ip address 172.70.0.1 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#exit

R4(config)#int loopback 8
R4(config-if)#ip address 172.80.0.1 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#exit

Enrutamiento

ROUTER R1

R1(config)#router eigrp 50
R1(config-router)#no auto-summary
R1(config-router)#network 20.0.0.0 0.0.0.3
R1(config-router)#network 10.10.0.0 0.0.0.255
R1(config-router)#network 10.20.0.0 0.0.0.255
R1(config-router)#network 10.30.0.0 0.0.0.255
R1(config-router)#exit

ROUTER R2

R2(config)#router eigrp 50
R2(config-router)#no auto-summary
R2(config-router)#network 20.0.0.0 0.0.0.3
R2(config-router)#exit

R2(config)#router ospf 1
R2(config-router)#network 20.0.0.4 0.0.0.3 area 0
R2(config-router)#exit

ROUTER R3

R3(config)#router ospf 1
R3(config-router)#network 20.0.0.4 0.0.0.3 area 0
R3(config-router)#network 30.3.3.0 0.0.0.255 area 0
R3(config-router)#network 60.1.1.0 0.0.0.255 area 60
R3(config-router)#network 60.1.2.0 0.0.0.255 area 60
R3(config-router)#network 60.1.3.0 0.0.0.255 area 60
R3(config-router)#exit

R3(config)#router rip
R3(config-router)#version 2
R3(config-router)#no auto-summary
R3(config-router)#network 20.0.0.8
R3(config-router)#exit

ROUTER R4

R4(config)#router rip
R4(config-router)#version 2
R4(config-router)#no auto-summary
R4(config-router)#network 20.0.0.8
R4(config-router)#network 172.70.0.0
R4(config-router)#network 172.80.0.0
R4(config-router)#exit

Redistribución

ROUTER R2

R2(config)#router eigrp 50
R2(config-router)#redistribute connected
R2(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500
R2(config-router)#exit

R2(config)#router ospf 1
R2(config-router)#redistribute eigrp 50 subnets
R2(config-router)#exit

ROUTER R3

R3(config)#router ospf 1
R3(config-router)#redistribute rip subnets
R3(config-router)#exit

R3(config)#router rip
R3(config-router)#redistribute ospf 1 metric 2
R3(config-router)#exit

Comprobar conectividad

ROUTER R1

R1(config)#do ping 200.2.2.2 source 10.10.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/22/52 ms
R1(config)#do ping 30.3.3.3 source 10.10.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/38/52 ms
R1(config)#do ping 60.1.1.1 source 10.10.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/46/76 ms
R1(config)#do ping 172.70.0.1 source 10.10.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/54/80 ms

Configuración loopbacks OSPF

ROUTER R3

R3(config)#int loopback 3
R3(config-if)#ip ospf network point-to-point
R3(config-if)#exit

R3(config)#int loopback 4
R3(config-if)#ip ospf network point-to-point
R3(config-if)#exit

R3(config)#int loopback 5
R3(config-if)#ip ospf network point-to-point
R3(config-if)#exit

R3(config)#int loopback 6
R3(config-if)#ip ospf network point-to-point
R3(config-if)#exit

Filtros

a) la ruta externa no debe ser conocida por RIP

SI NO DEBE SER RECONOCIDA POR RIP, ENTONCES DEBEMOS CONFIGURAR EL FILTRO EN EL ROUTER 3
QUE ES DONDE SE CONFIGURA LA REDISTRIBUCION A RIP.

PRIMERO COMPROBAMOS QUE RIP VE LA RED 200.2.2.0

R4(config)#do sh ip route
R 200.2.2.0/24 [120/2] via 20.0.0.9, 00:00:16, Serial1/2

AHORA CREAMOS EL FILTRO

R3(config)#access-list 1 permit 200.2.2.0
R3(config)#route-map deny200 deny 10
R3(config-route-map)#match ip address 1
R3(config-route-map)#exit
R3(config)#route-map deny200 permit 20
R3(config-route-map)#exit

AHORA LO AGREGAMOS A LA REDISTRIBUCION DE RIP
(PODEMOS VER EL COMANDO CON SH RUN SI NO LO RECORDAMOS)

R3(config)#router rip
R3(config-router)#redistribute ospf 1 metric 2 route-map deny200
R3(config-router)#exit

AHORA COMPROBAMOS QUE RIP NO VE LA RED 200.2.2.0

R4(config)#do sh ip route
20.0.0.0/30 is subnetted, 3 subnets
R 20.0.0.4 [120/1] via 20.0.0.9, 00:00:16, Serial1/2
R 20.0.0.0 [120/2] via 20.0.0.9, 00:00:16, Serial1/2
C 20.0.0.8 is directly connected, Serial1/2
172.70.0.0/24 is subnetted, 1 subnets
C 172.70.0.0 is directly connected, Loopback7
172.80.0.0/24 is subnetted, 1 subnets
C 172.80.0.0 is directly connected, Loopback8
10.0.0.0/24 is subnetted, 3 subnets
R 10.10.0.0 [120/2] via 20.0.0.9, 00:00:16, Serial1/2
R 10.30.0.0 [120/2] via 20.0.0.9, 00:00:16, Serial1/2
R 10.20.0.0 [120/2] via 20.0.0.9, 00:00:16, Serial1/2
60.0.0.0/24 is subnetted, 3 subnets
R 60.1.1.0 [120/2] via 20.0.0.9, 00:00:17, Serial1/2
R 60.1.3.0 [120/2] via 20.0.0.9, 00:00:17, Serial1/2
R 60.1.2.0 [120/2] via 20.0.0.9, 00:00:17, Serial1/2
30.0.0.0/24 is subnetted, 1 subnets
R 30.3.3.0 [120/2] via 20.0.0.9, 00:00:17, Serial1/2

b) el área 60 no debe ser conocida por EIGRP

PRIMERO COMPROBAMOS QUE EIGRP VE LAS REDES DEL AREA 60

R1(config)#do sh ip route
60.0.0.0/24 is subnetted, 3 subnets
D EX 60.1.1.0 [170/2195456] via 20.0.0.2, 00:15:55, Serial1/0
D EX 60.1.3.0 [170/2195456] via 20.0.0.2, 00:15:45, Serial1/0
D EX 60.1.2.0 [170/2195456] via 20.0.0.2, 00:15:45, Serial1/0

DEBEMOS CREAR EL FILTRO EN EL ROUTER 2 EN LA REDISTRIBUCION DE EIGRP

R2(config)#access-list 1 permit 60.1.1.0
R2(config)#access-list 1 permit 60.1.2.0
R2(config)#access-list 1 permit 60.1.3.0

R2(config)#route-map deny60 deny 10
R2(config-route-map)#match ip address 1
R2(config-route-map)#exit
R2(config)#route-map deny60 permit 20
R2(config-route-map)#exit

AGREGAMOS EL FILTRO A LA REDISTRIBUCION DE EIGRP

R2(config)#router eigrp 50
R2(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500 route-map deny60
R2(config-router)#exit

COMPROBAMOS SI SE VEN LAS REDES DEL AREA 60

R1(config)#do sh ip route
20.0.0.0/30 is subnetted, 3 subnets
D EX 20.0.0.4 [170/2681856] via 20.0.0.2, 00:30:49, Serial1/0
C 20.0.0.0 is directly connected, Serial1/0
D EX 20.0.0.8 [170/2195456] via 20.0.0.2, 00:23:52, Serial1/0
172.70.0.0/24 is subnetted, 1 subnets
D EX 172.70.0.0 [170/2195456] via 20.0.0.2, 00:23:52, Serial1/0
172.80.0.0/24 is subnetted, 1 subnets
D EX 172.80.0.0 [170/2195456] via 20.0.0.2, 00:23:52, Serial1/0
D EX 200.2.2.0/24 [170/2297856] via 20.0.0.2, 00:30:49, Serial1/0
10.0.0.0/24 is subnetted, 3 subnets
C 10.10.0.0 is directly connected, Loopback0
C 10.30.0.0 is directly connected, Loopback2
C 10.20.0.0 is directly connected, Loopback1
30.0.0.0/24 is subnetted, 1 subnets
D EX 30.3.3.0 [170/2195456] via 20.0.0.2, 00:18:04, Serial1/0

c) OSPF debe conocer las rutas L7 y L8 como E1, y

REVISAMOS COMO VE LAS RUTAS L7 Y L8 OSPF

R2(config)#do sh ip route
172.70.0.0/24 is subnetted, 1 subnets
O E2 172.70.0.0 [110/20] via 20.0.0.6, 00:20:17, Serial1/1
172.80.0.0/24 is subnetted, 1 subnets
O E2 172.80.0.0 [110/20] via 20.0.0.6, 00:20:17, Serial1/1

LAS VE COMO O E2. PARA CAMBIAR A E1, DEBEMOS CREAR UN FILTRO Y AGREGARLO EN LA REDISTRIBUCION OSPF R3

R3(config)#access-list 2 permit 172.70.0.0
R3(config)#access-list 2 permit 172.80.0.0

R3(config)#route-map E1 permit 10
R3(config-route-map)#match ip address 2
R3(config-route-map)#set metric-type type-1
R3(config-route-map)#exit

AGREGAMOS A LA REDISTRIBUCION EL FILTRO

R3(config)#router ospf 1
R3(config-router)#redistribute rip subnets route-map E1
R3(config-router)#exit

COMPROBAMOS QUE CAMBIO A E1

R2(config)#do sh ip route
172.70.0.0/24 is subnetted, 1 subnets
O E1 172.70.0.0 [110/84] via 20.0.0.6, 00:00:30, Serial1/1
172.80.0.0/24 is subnetted, 1 subnets
O E1 172.80.0.0 [110/84] via 20.0.0.6, 00:00:10, Serial1/1

d) la ruta L2 no debe ser conocida por RIP.

COPROBAMOS QUE RIP CONOCE LA RUTA L2

R4(config)#do sh ip route
R 10.30.0.0 [120/2] via 20.0.0.9, 00:00:03, Serial1/2

CREAMOS EL FILTRO EN R3 AGREGANDO LA REGLA A LA ROUTE-MAP YA CREADA
YA QUE LA REDISTRIBUCION SOLO ACEPTA 1 ROUTE-MAP

CREAMOS EL ACCESS LIST 2 CON LA RED 10.30.0.0

R3(config)#access-list 2 permit 10.30.0.0

AHORA CREAMOS UN ROUTE-MAP CON EL MISMO NOMBRE DEL FILTRO DE LA LETRA «a)» (EL NOMBRE ES deny200)
CON EL NUMERO 15 (PUEDE SER CUALQUIER NUMERO MENOR AL 20 QUE ES EL QUE PERMITE LO DEMAS)

R3(config)#route-map deny200 deny 15
R3(config-route-map)#match ip address 2
R3(config-route-map)#exit

COMPROBAMOS QUE RIP NO RECONOCE LA RED 10.30.0.0

R4(config)#do sh ip route
20.0.0.0/30 is subnetted, 3 subnets
R 20.0.0.4 [120/1] via 20.0.0.9, 00:00:12, Serial1/2
R 20.0.0.0 [120/2] via 20.0.0.9, 00:00:12, Serial1/2
C 20.0.0.8 is directly connected, Serial1/2
172.70.0.0/24 is subnetted, 1 subnets
C 172.70.0.0 is directly connected, Loopback7
172.80.0.0/24 is subnetted, 1 subnets
C 172.80.0.0 is directly connected, Loopback8
10.0.0.0/24 is subnetted, 2 subnets
R 10.10.0.0 [120/2] via 20.0.0.9, 00:00:12, Serial1/2
R 10.20.0.0 [120/2] via 20.0.0.9, 00:00:12, Serial1/2
60.0.0.0/24 is subnetted, 3 subnets
R 60.1.1.0 [120/2] via 20.0.0.9, 00:00:12, Serial1/2
R 60.1.3.0 [120/2] via 20.0.0.9, 00:00:13, Serial1/2
R 60.1.2.0 [120/2] via 20.0.0.9, 00:00:13, Serial1/2
30.0.0.0/24 is subnetted, 1 subnets
R 30.3.3.0 [120/2] via 20.0.0.9, 00:00:13, Serial1/2

 

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Francisco Molina

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