Escenario de enrutamiento multiprotocolo

Fecha: 4 de septiembre del 2012

 

Mediante este escenario se puede verificar el ingreso de una ruta específica en la tabla de enrutamiento, dependiendo de la

distancia administrativa (AD) de cada protocolo, y de las falencias del enrutamiento estático ante los  cambios en la topología.

 

Escenario (puede bajarse de ftp://ftp.vilarrasa.com.ar/ ,  user y pass: ccna)

 

Pruebas de tráfico

 

PC>ping 192.168.1.10 (verificamos conectividad)

 

Pinging 192.168.1.10 with 32 bytes of data:

 

Reply from 192.168.1.10: bytes=32 time=141ms TTL=125

Reply from 192.168.1.10: bytes=32 time=156ms TTL=125

Reply from 192.168.1.10: bytes=32 time=156ms TTL=125

Reply from 192.168.1.10: bytes=32 time=156ms TTL=125

 

Ping statistics for 192.168.1.10:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 141ms, Maximum = 156ms, Average = 152ms

 

PC>

 

PC>tracert 192.168.1.10 (determinamos la ruta)

 

Tracing route to 192.168.1.10 over a maximum of 30 hops:

 

  1   16 ms     31 ms     31 ms     192.168.2.1 (router Cordoba)

  2   78 ms     94 ms     78 ms     10.0.0.1 (router estático)

  3   110 ms    110 ms    141 ms    10.0.0.9 (router Rosario)

  4   141 ms    156 ms    156 ms    192.168.1.10

 

Trace complete.

 

PC>

 

Verificación

 

Cordoba#sh ip route

---resumido---

 

     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

C       10.0.0.0/29 is directly connected, FastEthernet0/1

R       10.0.0.8/30 is possibly down, routing via 10.0.0.4, FastEthernet0/1

D       10.0.0.12/30 [90/2172416] via 10.0.0.2, 00:08:42, FastEthernet0/1

O       10.0.0.16/30 [110/65] via 10.0.0.3, 00:08:24, FastEthernet0/1

R       10.0.0.20/30 [120/1] via 10.0.0.4, 00:00:02, FastEthernet0/1

S    192.168.1.0/24 [1/0] via 10.0.0.1 (ver AD 1)

C    192.168.2.0/24 is directly connected, FastEthernet0/0

Cordoba#

 

Caída del vínculo de enrutamiento estático

 

 

%LINK-5-CHANGED: Interface Serial0/0/0, changed state to down

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to down

 

PC>tracert 192.168.1.10 (el tracert no llega)

 

Tracing route to 192.168.1.10 over a maximum of 30 hops:

 

  1   32 ms     31 ms     31 ms     192.168.2.1 (router Cordoba)

  2   *         *         *         Request timed out.

  3   *         *         *         Request timed out.

  4   *

Control-C

^C

PC>

 

Verificación desde Rosario

 

Rosario#sh ip route (no hay estáticas ya que la red está directamente conectada)

---resumido---

 

     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

D       10.0.0.0/29 [90/2172416] via 10.0.0.14, 00:11:29, Serial0/0/1

C       10.0.0.12/30 is directly connected, Serial0/0/1

C       10.0.0.16/30 is directly connected, Serial0/1/0

C       10.0.0.20/30 is directly connected, Serial0/1/1

C    192.168.1.0/24 is directly connected, FastEthernet0/0

D    192.168.2.0/24 [90/2174976] via 10.0.0.14, 00:07:19, Serial0/0/1 (vía EIGRP)

Rosario#

 

Verificación desde Córdoba

 

Cordoba#sh ip route

---resumido---

 

     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

C       10.0.0.0/29 is directly connected, FastEthernet0/1

R       10.0.0.8/30 is possibly down, routing via 10.0.0.4, FastEthernet0/1

D       10.0.0.12/30 [90/2172416] via 10.0.0.2, 00:08:42, FastEthernet0/1

O       10.0.0.16/30 [110/65] via 10.0.0.3, 00:08:24, FastEthernet0/1

R       10.0.0.20/30 [120/1] via 10.0.0.4, 00:00:02, FastEthernet0/1

S    192.168.1.0/24 [1/0] via 10.0.0.1 (aún existe ya que hay un salto intermedio)

C    192.168.2.0/24 is directly connected, FastEthernet0/0

Cordoba#

 

Solución

 

Cordoba#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Cordoba(config)#no ip route 192.168.1.0 255.255.255.0 10.0.0.1 (se elimina la ruta estática)

Cordoba(config)#^Z

Cordoba#

 

Verificación

 

Cordoba#sh ip route

---resumido---

 

     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

C       10.0.0.0/29 is directly connected, FastEthernet0/1

D       10.0.0.12/30 [90/2172416] via 10.0.0.2, 00:09:59, FastEthernet0/1

O       10.0.0.16/30 [110/65] via 10.0.0.3, 00:09:41, FastEthernet0/1

R       10.0.0.20/30 [120/1] via 10.0.0.4, 00:00:23, FastEthernet0/1

D    192.168.1.0/24 [90/2174976] via 10.0.0.2, 00:09:59, FastEthernet0/1 (ver AD 90)

C    192.168.2.0/24 is directly connected, FastEthernet0/0

Cordoba#

 

PC>tracert 192.168.1.10 (ahora el tracert llega)

 

Tracing route to 192.168.1.10 over a maximum of 30 hops:

 

  1   31 ms     31 ms     31 ms     192.168.2.1 (router Cordoba)

  2   78 ms     78 ms     94 ms     10.0.0.2 (router EIGRP)

  3   109 ms    81 ms     110 ms    10.0.0.13 (router Rosario)

  4   127 ms    141 ms    141 ms    192.168.1.10

 

Trace complete.

 

PC>

 

Caída del vínculo de enrutamiento EIGRP

 

 

%DUAL-5-NBRCHANGE: IP-EIGRP 100: Neighbor 10.0.0.2 (FastEthernet0/1) is down: holding time expired

 

Cordoba#sh ip route

---resumido---

     10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks

C       10.0.0.0/29 is directly connected, FastEthernet0/1

O       10.0.0.16/30 [110/65] via 10.0.0.3, 00:12:56, FastEthernet0/1

R       10.0.0.20/30 [120/1] via 10.0.0.4, 00:00:19, FastEthernet0/1

O    192.168.1.0/24 [110/66] via 10.0.0.3, 00:12:56, FastEthernet0/1 (ver AD 110)

C    192.168.2.0/24 is directly connected, FastEthernet0/0

Cordoba#

 

PC>tracert 192.168.1.10 (el tracert llega sin modificaciones en los routers)

 

Tracing route to 192.168.1.10 over a maximum of 30 hops:

 

  1   31 ms     32 ms     18 ms     192.168.2.1 (router Cordoba)

  2   79 ms     94 ms     62 ms     10.0.0.3 (router OSPF)

  3   110 ms    94 ms     125 ms    10.0.0.17 (router Rosario)

  4   156 ms    157 ms    156 ms    192.168.1.10

 

Trace complete.

 

PC>

 

Caída del vínculo de enrutamiento OSPF

 

 

00:41:04: %OSPF-5-ADJCHG: Process 1, Nbr 10.0.0.18 on FastEthernet0/1 from FULL to DOWN,

Neighbor Down: Dead timer expired

 

00:41:04: %OSPF-5-ADJCHG: Process 1, Nbr 10.0.0.18 on FastEthernet0/1 from FULL to DOWN,

Neighbor Down: Interface down or detached

 

Cordoba#sh ip route

---resumido---

 

     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C       10.0.0.0/29 is directly connected, FastEthernet0/1

R       10.0.0.20/30 [120/1] via 10.0.0.4, 00:00:13, FastEthernet0/1

R    192.168.1.0/24 [120/2] via 10.0.0.4, 00:00:13, FastEthernet0/1 (ver AD 120)

C    192.168.2.0/24 is directly connected, FastEthernet0/0

Cordoba#

 

PC>tracert 192.168.1.10 (el tracer llega pero después de varios intentos debido a la lentitud de RIP)

 

Tracing route to 192.168.1.10 over a maximum of 30 hops:

 

  1   18 ms     32 ms     31 ms     192.168.2.1 (router Cordoba)

  2   78 ms     63 ms     94 ms     10.0.0.4 (router RIP)

  3   110 ms    125 ms    125 ms    10.0.0.21 (router Rosario)

  4   140 ms    156 ms    157 ms    192.168.1.10

 

Trace complete.

 

PC>

 

Configuraciones

 

Rosario#sh runn (se muestra lo mas relevante)

Building configuration...

 

!

hostname Rosario

!

interface FastEthernet0/0

 ip address 192.168.1.1 255.255.255.0

!

interface Serial0/0/0

 ip address 10.0.0.9 255.255.255.252

 clock rate 1000000

!

interface Serial0/0/1

 ip address 10.0.0.13 255.255.255.252

 clock rate 1000000

!

interface Serial0/1/0

 ip address 10.0.0.17 255.255.255.252

 clock rate 1000000

!

interface Serial0/1/1

 ip address 10.0.0.21 255.255.255.252

 clock rate 1000000

!

!

router eigrp 100

 network 10.0.0.12 0.0.0.3

 network 192.168.1.0

 no auto-summary

!

router ospf 1

 log-adjacency-changes

 network 192.168.1.0 0.0.0.255 area 0

 network 10.0.0.16 0.0.0.3 area 0

!

router rip

 version 2

 passive-interface Serial0/0/0

 passive-interface Serial0/0/1

 passive-interface Serial0/1/0

 network 10.0.0.0

 network 192.168.1.0

!

ip classless

ip route 192.168.2.0 255.255.255.0 10.0.0.10

!

end

 

Estatico#sh runn (se muestra lo mas relevante)

Building configuration...

 

!

hostname Estatico

!

interface FastEthernet0/0

 ip address 10.0.0.1 255.255.255.248

!

interface Serial0/0/0

 ip address 10.0.0.10 255.255.255.252

!

!

ip classless

ip route 192.168.1.0 255.255.255.0 10.0.0.9

ip route 192.168.2.0 255.255.255.0 10.0.0.5

!

end

 

EIGRP#sh runn (se muestra lo mas relevante)

Building configuration...

 

!

hostname EIGRP

!

interface FastEthernet0/0

 ip address 10.0.0.2 255.255.255.248

!

interface Serial0/0/0

 ip address 10.0.0.14 255.255.255.252

!

!

router eigrp 100

 network 10.0.0.0 0.0.0.7

 network 10.0.0.12 0.0.0.3

 no auto-summary

!

ip classless

!

end

 

OSPF#sh runn (se muestra lo mas relevante)

Building configuration...

 

!

hostname OSPF

!

!

interface FastEthernet0/0

 ip address 10.0.0.3 255.255.255.248

!

interface Serial0/0/0

 ip address 10.0.0.18 255.255.255.252

!

!

router ospf 1

 log-adjacency-changes

 network 10.0.0.16 0.0.0.3 area 0

 network 10.0.0.0 0.0.0.7 area 0

!

ip classless

!

end

 

RIP#sh runn (se muestra lo mas relevante)

Building configuration...

 

!

hostname RIP

!

!

interface FastEthernet0/0

 ip address 10.0.0.4 255.255.255.248

!

interface Serial0/0/0

 ip address 10.0.0.22 255.255.255.252

!

!

router rip

 version 2

 network 10.0.0.0

!

ip classless

!

end

 

Cordoba#sh runn (se muestra lo mas relevante)

Building configuration...

 

!

hostname Cordoba

!

interface FastEthernet0/0

 ip address 192.168.2.1 255.255.255.0

!

interface FastEthernet0/1

 ip address 10.0.0.5 255.255.255.248

!

!

router eigrp 100

 network 192.168.2.0

 network 10.0.0.0 0.0.0.7

 no auto-summary

!

router ospf 1

 log-adjacency-changes

 network 192.168.2.0 0.0.0.255 area 0

 network 10.0.0.0 0.0.0.7 area 0

!

router rip

 version 2

 network 10.0.0.0

 network 192.168.2.0

!

ip classless

!

!

end

 

(2012) Routing don´t fun pretty girls

Rosario, Argentina