Francisco Molina

Ingeniero en Conectividad y Redes

Cisco Redes 

Ejercicio BGP

Francisco Molina , ,

Ejercicio BGP

Este es un nuevo ejercicio CISCO, ahora del protocolo BGP. Está desarrollado según la imagen que está inserta a continuación.

1.-  Direccionar las interface físicas y lógicas.

ESTA PARTE ES SOLO ASIGNAR LAS IPs Y LEVANTAR LAS INTERFACES

R1#conf t
R1(config)#int s1/0
R1(config-if)#ip address 10.1.102.1 255.255.255.248
R1(config-if)#clock rate 128000
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#int s1/2
R1(config-if)#ip address 10.1.103.1 255.255.255.248
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#int f0/0
R1(config-if)#ip address 192.168.14.1 255.255.255.252
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#int lo 1
R1(config-if)#ip address 10.1.1.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit

R2#conf t
R2(config)#int s1/0
R2(config-if)#ip address 10.1.102.2 255.255.255.248
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#int s1/1
R2(config-if)#ip address 10.1.203.2 255.255.255.248
R2(config-if)#clock rate 128000
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#int lo 2
R2(config-if)#ip address 10.2.2.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit

R3#conf t
R3(config)#int s1/1
R3(config-if)#ip address 10.1.203.3 255.255.255.248
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#int s1/2
R3(config-if)#ip address 10.1.103.3 255.255.255.248
R3(config-if)#clock rate 128000
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#int s1/3
R3(config-if)#ip address 192.168.34.1 255.255.255.252
R3(config-if)#clock rate 128000
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#int lo 3
R3(config-if)#ip address 10.3.3.3 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#exit

R4#conf t
R4(config)#int s1/3
R4(config-if)#ip address 192.168.34.2 255.255.255.252
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#int f0/0
R4(config-if)#ip address 192.168.14.2 255.255.255.252
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#int lo 4
R4(config-if)#ip address 172.16.4.1 255.255.252.0
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#int lo 8
R4(config-if)#ip address 172.16.8.1 255.255.252.0
R4(config-if)#no shutdown
R4(config-if)#exit

2.- Configurar EIGRP SA 65001 en ITA. No informar las redes 192.168.14.0/ 30 y 192.168.34.0/30.

ACA CONFIGURAMOS EIGRP CON LA RED 10.0.0.0 O CON CADA RED CONECTADA DIRECTAMENTE.
LO HICE DE ESTA MANERA PORQUE ES MAS RAPIDO
OJO, ES SOLO EN LAS REDES DE ITA, LAS INTERFACES QUE VAN HACIA TDP NO SE INCLUYEN.

R1(config)#router eigrp 65001
R1(config-router)#no auto-summary
R1(config-router)#network 10.0.0.0
R1(config-router)#exit

R2(config)#router eigrp 65001
R2(config-router)#no auto-summary
R2(config-router)#network 10.0.0.0
R2(config-router)#exit

R3(config)#router eigrp 65001
R3(config-router)#no auto-summary
R3(config-router)#network 10.0.0.0
R3(config-router)#exit

3.- Configurar IBGP en el SA 65001 en ITA (malla completa).

Usar la dirección de las interfaces loopback para la relación de vecindad.
Informar las direcciones de las redes de las loopback.

ESTA ES LA CONFIGURACION DE IBGP:

  • SE AGREGAN LAS NEIGHBOR CON EL AS
  • SE AGREGAN LAS NEIGHBOR CON EL LOOPBACK DE LA RED
  • SE AGREGAN LAS NEIGHBOR INFORMANDO LA RED CON NEXT-HOP-SELF
R1(config)#router bgp 65001
R1(config-router)#neighbor 10.2.2.2 remote-as 65001
R1(config-router)#neighbor 10.2.2.2 update-source lo 1
R1(config-router)#neighbor 10.2.2.2 next-hop-self
R1(config-router)#neighbor 10.3.3.3 remote-as 65001
R1(config-router)#neighbor 10.3.3.3 update-source lo 1
R1(config-router)#neighbor 10.3.3.3 next-hop-self
R1(config-router)#exit

R2(config)#router bgp 65001
R2(config-router)#neighbor 10.1.1.1 remote-as 65001
R2(config-router)#neighbor 10.1.1.1 update-source lo 2
R2(config-router)#neighbor 10.1.1.1 next-hop-self
R2(config-router)#neighbor 10.3.3.3 remote-as 65001
R2(config-router)#neighbor 10.3.3.3 update-source lo 2
R2(config-router)#neighbor 10.3.3.3 next-hop-self
R2(config-router)#exit

R3(config)#router bgp 65001
R3(config-router)#neighbor 10.1.1.1 remote-as 65001
R3(config-router)#neighbor 10.1.1.1 update-source lo 3
R3(config-router)#neighbor 10.1.1.1 next-hop-self
R3(config-router)#neighbor 10.2.2.2 remote-as 65001
R3(config-router)#neighbor 10.2.2.2 update-source lo 3
R3(config-router)#neighbor 10.2.2.2 next-hop-self
R3(config-router)#exit

4.- Configurar EBGP entre el SA 650001 y el SA 65002. Todos los routers deben estar participando en el proceso BGP.

CONFIGURACION DE EBGP:

  • SE AGREGAN LAS NEIGHBOR CON EL AS DEL VECINO
  • SE AGREGAN LAS NETWORK DE CADA ROUTER
  • ES POSIBLE AGREGAR LAS REDES DE LAS SERIALES, PERO NO ES NECESARIO (NO LAS AGREGUE)
R1(config)#router bgp 65001
R1(config-router)#neighbor 192.168.14.2 remote-as 65002
R1(config-router)#network 10.1.1.0 mask 255.255.255.0
R1(config-router)#exit

OJO CON ESTA PARTE. EL R2 NO TIENE NEIGHBOR CON TDP, PERO IGUAL SE INGRESA SU NETWORK A BGP O NO SERA VISTA ESA RED.

R2(config-router)#network 10.2.2.0 mask 255.255.255.0
R3(config)#router bgp 65001
R3(config-router)#neighbor 192.168.34.2 remote-as 65002
R3(config-router)#network 10.3.3.0 mask 255.255.255.0
R3(config-router)#exit

R4(config)#router bgp 65002
R4(config-router)#neighbor 192.168.14.1 remote-as 65001
R4(config-router)#neighbor 192.168.34.1 remote-as 65001
R4(config-router)#network 172.16.4.0 mask 255.255.252.0
R4(config-router)#network 172.16.8.0 mask 255.255.252.0
R4(config-router)#exit

5.-  Revisar la información de las tablas BGP y las tablas de enrutamiento.

R1(config)#do sh ip route
192.168.14.0/30 is subnetted, 1 subnets
C 192.168.14.0 is directly connected, FastEthernet0/0
172.16.0.0/22 is subnetted, 2 subnets
B 172.16.8.0 [20/0] via 192.168.14.2, 00:06:32
B 172.16.4.0 [20/0] via 192.168.14.2, 00:06:32
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
D 10.3.3.0/24 [90/2297856] via 10.1.103.3, 00:44:55, Serial1/2
D 10.2.2.0/24 [90/2297856] via 10.1.102.2, 00:44:55, Serial1/0
C 10.1.1.0/24 is directly connected, Loopback1
C 10.1.103.0/29 is directly connected, Serial1/2
C 10.1.102.0/29 is directly connected, Serial1/0
D 10.1.203.0/29 [90/2681856] via 10.1.103.3, 00:44:56, Serial1/2
[90/2681856] via 10.1.102.2, 00:44:56, Serial1/0

R1(config)#do sh ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 10.1.1.0/24 0.0.0.0 0 32768 i
r>i10.2.2.0/24 10.2.2.2 0 100 0 i
r>i10.3.3.0/24 10.3.3.3 0 100 0 i
* i172.16.4.0/22 10.3.3.3 0 100 0 65002 i
*> 192.168.14.2 0 0 65002 i
* i172.16.8.0/22 10.3.3.3 0 100 0 65002 i
*> 192.168.14.2 0 0 65002 i
*> 192.168.14.0/30 0.0.0.0 0 32768 i

R2(config)#do sh ip route
192.168.14.0/30 is subnetted, 1 subnets
B 192.168.14.0 [200/0] via 10.1.1.1, 00:07:43
172.16.0.0/22 is subnetted, 2 subnets
B 172.16.8.0 [200/0] via 10.1.1.1, 00:07:12
B 172.16.4.0 [200/0] via 10.1.1.1, 00:07:12
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
D 10.3.3.0/24 [90/2297856] via 10.1.203.3, 00:45:36, Serial1/1
C 10.2.2.0/24 is directly connected, Loopback2
D 10.1.1.0/24 [90/2297856] via 10.1.102.1, 00:45:36, Serial1/0
D 10.1.103.0/29 [90/2681856] via 10.1.203.3, 00:45:36, Serial1/1
[90/2681856] via 10.1.102.1, 00:45:36, Serial1/0
C 10.1.102.0/29 is directly connected, Serial1/0
C 10.1.203.0/29 is directly connected, Serial1/1

R2(config)#do sh ip bgp
Network Next Hop Metric LocPrf Weight Path
r>i10.1.1.0/24 10.1.1.1 0 100 0 i
*> 10.2.2.0/24 0.0.0.0 0 32768 i
r>i10.3.3.0/24 10.3.3.3 0 100 0 i
* i172.16.4.0/22 10.3.3.3 0 100 0 65002 i
*>i 10.1.1.1 0 100 0 65002 i
* i172.16.8.0/22 10.3.3.3 0 100 0 65002 i
*>i 10.1.1.1 0 100 0 65002 i
*>i192.168.14.0/30 10.1.1.1 0 100 0 i

R3(config)#do sh ip route
192.168.14.0/30 is subnetted, 1 subnets
B 192.168.14.0 [200/0] via 10.1.1.1, 00:08:25
172.16.0.0/22 is subnetted, 2 subnets
B 172.16.8.0 [20/0] via 192.168.34.2, 00:07:54
B 172.16.4.0 [20/0] via 192.168.34.2, 00:07:54
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C 10.3.3.0/24 is directly connected, Loopback3
D 10.2.2.0/24 [90/2297856] via 10.1.203.2, 00:46:18, Serial1/1
D 10.1.1.0/24 [90/2297856] via 10.1.103.1, 00:46:18, Serial1/2
C 10.1.103.0/29 is directly connected, Serial1/2
D 10.1.102.0/29 [90/2681856] via 10.1.203.2, 00:46:18, Serial1/1
[90/2681856] via 10.1.103.1, 00:46:18, Serial1/2
C 10.1.203.0/29 is directly connected, Serial1/1
192.168.34.0/30 is subnetted, 1 subnets
C 192.168.34.0 is directly connected, Serial1/3

R3(config)#do sh ip bgp
Network Next Hop Metric LocPrf Weight Path
r>i10.1.1.0/24 10.1.1.1 0 100 0 i
r>i10.2.2.0/24 10.2.2.2 0 100 0 i
*> 10.3.3.0/24 0.0.0.0 0 32768 i
* i172.16.4.0/22 10.1.1.1 0 100 0 65002 i
*> 192.168.34.2 0 0 65002 i
* i172.16.8.0/22 10.1.1.1 0 100 0 65002 i
*> 192.168.34.2 0 0 65002 i
*>i192.168.14.0/30 10.1.1.1 0 100 0 i

R4(config)#do sh ip route
192.168.14.0/30 is subnetted, 1 subnets
C 192.168.14.0 is directly connected, FastEthernet0/0
172.16.0.0/22 is subnetted, 2 subnets
C 172.16.8.0 is directly connected, Loopback8
C 172.16.4.0 is directly connected, Loopback4
10.0.0.0/24 is subnetted, 3 subnets
B 10.3.3.0 [20/0] via 192.168.34.1, 00:09:18
B 10.2.2.0 [20/0] via 192.168.14.1, 00:07:14
B 10.1.1.0 [20/0] via 192.168.14.1, 00:09:18
192.168.34.0/30 is subnetted, 1 subnets
C 192.168.34.0 is directly connected, Serial1/3

R4(config)#do sh ip bgp
Network Next Hop Metric LocPrf Weight Path
* 10.1.1.0/24 192.168.34.1 0 65001 i
*> 192.168.14.1 0 0 65001 i
* 10.2.2.0/24 192.168.34.1 0 65001 i
*> 192.168.14.1 0 65001 i
* 10.3.3.0/24 192.168.14.1 0 65001 i
*> 192.168.34.1 0 0 65001 i
*> 172.16.4.0/22 0.0.0.0 0 32768 i
*> 172.16.8.0/22 0.0.0.0 0 32768 i
r 192.168.14.0/30 192.168.34.1 0 65001 i
r> 192.168.14.1 0 0 65001 i

6.- Probar conectividad desde la red ITA a la red TDP, usar el comando ping y el comando traceroute.

LAS PRUEBAS DE PING Y TRACEROUTE SIEMPRE DEBEN SER HECHAS CON EL COMANDO SOURCE.

R1(config)#do ping 172.16.4.1 source 10.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/32/60 ms
R1(config)#do traceroute 172.16.4.1 source 10.1.1.1
1 192.168.14.2 44 msec 40 msec 28 msec

R2(config)#do ping 172.16.4.1 source 10.2.2.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/61/104 ms
R2(config)#do traceroute 172.16.4.1 source 10.2.2.2
1 10.1.102.1 48 msec 36 msec 24 msec
2 192.168.14.2 124 msec 72 msec 64 msec

R3(config)#do ping 172.16.4.1 source 10.3.3.3
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/26/36 ms
R3(config)#do traceroute 172.16.4.1 source 10.3.3.3
1 192.168.34.2 24 msec 40 msec 32 msec

7.- Probar conectividad desde la red TDP a la red ITA, usar el comando ping y el comando traceroute.

R4(config)#do ping 10.1.1.1 source 172.16.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/36/52 ms

R4(config)#do traceroute 10.1.1.1 source 172.16.4.1
1 192.168.14.1 24 msec 44 msec 12 msec

R4(config)#do ping 10.2.2.2 source 172.16.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/70/108 ms

R4(config)#do traceroute 10.2.2.2 source 172.16.4.1
1 192.168.14.1 16 msec 28 msec 40 msec
2 10.1.102.2 124 msec 88 msec 52 msec

R4(config)#do ping 10.3.3.3 source 172.16.4.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/40/72 ms

R4(config)#do traceroute 10.3.3.3 source 172.16.4.1
1 192.168.34.1 24 msec 40 msec 8 msec

8.- Si todo lo anterior se ha cumplido, entonces aplicar el atributo Weight para que la red TDP
se conecte a ITA por el enlace 192.168.14.0.

PARA DAR PRIORIDAD, SE DEBE DAR UN WEIGHT MAYOR.

R4(config-router)#neighbor 192.168.34.1 weight 100
R4(config-router)#neighbor 192.168.14.1 weight 200

OJO CON ESTO. SI REALIZAMOS UN CAMBIO EN BGP Y VEMOS QUE NO APARECEN, DEBEMOS APLICAR ESTE COMANDO: clear ip bgp *
ESTO BORRA LA INFORMACIÓN BGP Y SE DEBE ESPERAR UNOS SEGUNDOS PARA QUE LAS TABLAS DE BGP TENGAN CONVERGENCIA.

R4(config-router)#do clear ip bgp *

9.- Modificar el atributo Local Preference para que la red ITA prefiera el enlace 192.168.34.0 para conectarse con la red TPD.

PARA DAR PRIORIDAD, SE DEBE DAR UNA PREFERENCIA MAYOR.

R1(config)#route-map SECUNDARIO permit 10
R1(config-route-map)#set local-preference 150
R1(config-route-map)#exit

R1(config)#router bgp 65001
R1(config-router)#neighbor 192.168.14.2 route-map SECUNDARIO in
R1(config-router)#exit

R3(config)#route-map PRIMARIO permit 10
R3(config-route-map)#set local-preference 125
R3(config-route-map)#exit

R3(config)#router bgp 65001
R3(config-router)#neighbor 192.168.34.2 route-map PRIMARIO in
R3(config-router)#exit

R3(config)#do clear ip bgp *

R3(config)#do sh ip route
192.168.14.0/30 is subnetted, 1 subnets
B 192.168.14.0 [200/0] via 10.1.1.1, 00:02:43
172.16.0.0/22 is subnetted, 2 subnets
B 172.16.8.0 [20/0] via 192.168.34.2, 00:03:44
B 172.16.4.0 [20/0] via 192.168.34.2, 00:03:44
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C 10.3.3.0/24 is directly connected, Loopback3
D 10.2.2.0/24 [90/2297856] via 10.1.203.2, 01:59:25, Serial1/1
D 10.1.1.0/24 [90/2297856] via 10.1.103.1, 01:59:25, Serial1/2
C 10.1.103.0/29 is directly connected, Serial1/2
D 10.1.102.0/29 [90/2681856] via 10.1.203.2, 01:59:25, Serial1/1
[90/2681856] via 10.1.103.1, 01:59:25, Serial1/2
C 10.1.203.0/29 is directly connected, Serial1/1
192.168.34.0/30 is subnetted, 1 subnets
C 192.168.34.0 is directly connected, Serial1/3

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