Frame Relay. Maqueta backup con dos CVPs permanentes

     El objetivo de esta maqueta es:

• Implementar una red Frame Relay con 2 routers funcionando como switches y utilizando entre ellos el protocolo estándar de señalización NNI (Network-to-Network Interface). 
• Probar la funcionalidad de respaldar la conectividad a través de la nube Frame Relay mediante la implementación de 2 caminos con CVPs permanentes.

     Para ello se configuran los routers ‘HUBIBM’ y ‘HUBSAB’ como FRAD (Frame Relay Access Device) proporcionando LMI ccitt y clock (2M) a los CPE (Customer Premise Equipment) ‘IBM’ y ‘SAB’.

     La elección del camino ‘preferente’ viene determinada por el peso de las rutas.

     El esquema es el siguiente:

     Configuración nodos de red:

hostname HUBIBM

 !Habilita el switching de paquetes Frame Relay

frame-relay switching

!

interface Serial0/0

 no ip address

 encapsulation frame-relay

 clockrate 500000

 no fair-queue

 frame-relay lmi-type q933a

 frame-relay intf-type dce

!Especifica una ruta estática para el PVC switching

 frame-relay route 100 interface Serial0/2 200

!        

interface Serial0/1

 no ip address

 encapsulation frame-relay IETF

 clockrate 500000

 frame-relay lmi-type q933a

 frame-relay intf-type dce

 frame-relay route 101 interface Serial0/2 201

!

interface Serial0/2

 no ip address

 encapsulation frame-relay IETF

 clockrate 2000000

 frame-relay lmi-type q933a

!Configura el interface para NNI

 frame-relay intf-type nni

 frame-relay route 200 interface Serial0/0 100

 frame-relay route 201 interface Serial0/1 101

------------------------------------------------------------------------------------------------------

hostname HUBSAB

 !Habilita el switching de paquetes Frame Relay

frame-relay switching

!

interface Serial1/0

 no ip address

 encapsulation frame-relay IETF

 no fair-queue

 frame-relay lmi-type q933a

!Configura el interface para NNI

 frame-relay intf-type nni

!Especifica una ruta estática para el PVC switching

 frame-relay route 200 interface Serial1/1 300

 frame-relay route 201 interface Serial1/1 301

!

interface Serial1/1

 no ip address

 encapsulation frame-relay IETF

 clock rate 1000000

 frame-relay lmi-type q933a

 frame-relay intf-type dce

 frame-relay route 300 interface Serial1/0 200

 frame-relay route 301 interface Serial1/0 201

     Configuración equipos cliente:

hostname IBM

!

interface FastEthernet0/0

 ip address 40.40.40.1 255.255.255.0

!

interface Serial0/0

 no ip address

 encapsulation frame-relay IETF

 no ip route-cache cef

 no ip route-cache

 no fair-queue

 frame-relay lmi-type q933a

!

interface Serial0/0.101 point-to-point

 bandwidth 1000000

 ip address 20.20.20.1 255.255.255.0

 no ip route-cache

 no ip mroute-cache

 no cdp enable

 frame-relay interface-dlci 101  

!

interface Serial0/1

 no ip address

 encapsulation frame-relay IETF

 no ip route-cache cef

 no ip route-cache

 frame-relay lmi-type q933a

!

interface Serial0/1.100 point-to-point

 bandwidth 1000000

 ip address 10.10.10.1 255.255.255.0

 no ip route-cache

 no ip mroute-cache

 no cdp enable

 frame-relay interface-dlci 100  

!

ip route 50.50.50.0 255.255.255.0 20.20.20.2

ip route 50.50.50.0 255.255.255.0 10.10.10.2 100

----------------------------------------------------------------------------------------------------------------

hostname SAB

!

interface Ethernet0/0

 ip address 50.50.50.1 255.255.255.0

 !

interface Serial0/1

 no ip address

 encapsulation frame-relay IETF

 frame-relay lmi-type q933a

!

interface Serial0/1.300 point-to-point

 ip address 10.10.10.2 255.255.255.0

 frame-relay interface-dlci 300  

!

interface Serial0/1.301 point-to-point

 ip address 20.20.20.2 255.255.255.0

 frame-relay interface-dlci 301  

!

ip route 40.40.40.0 255.255.255.0 20.20.20.1

ip route 40.40.40.0 255.255.255.0 10.10.10.1 100

     Notas sobre las pruebas:

     - Rutas Frame Relay y estado:



HUBIBM#sh frame-relay route 
Input Intf      Input Dlci      Output Intf     Output Dlci     Status
Serial0/0       100             Serial0/2       200             active
Serial0/1       101             Serial0/2       201             active
Serial0/2       200             Serial0/0       100             active
Serial0/2       201             Serial0/1       101             active


HUBSAB#sh frame-relay route 
Input Intf      Input Dlci      Output Intf     Output Dlci     Status
Serial1/0       200             Serial1/1       300             active
Serial1/0       201             Serial1/1       301             active
Serial1/1       300             Serial1/0       200             active
Serial1/1       301             Serial1/0       201             active




     - Estado al cortar la ruta 'principal':



HUBIBM#sh frame-relay route 
Input Intf      Input Dlci      Output Intf     Output Dlci     Status
Serial0/0       100             Serial0/2       200             active
Serial0/1       101             Serial0/2       201             inactive
Serial0/2       200             Serial0/0       100             active
Serial0/2       201             Serial0/1       101             active


     - Traceroute antes y después de cortar el camino principal:


IBM#traceroute 50.50.50.1


Type escape sequence to abort.
Tracing the route to 50.50.50.1


  1 20.20.20.2 4 msec *  8 msec


IBM#
*Mar  1 21:32:15.398: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down
*Mar  1 21:32:16.398: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down


IBM#traceroute 50.50.50.1


Type escape sequence to abort.
Tracing the route to 50.50.50.1


  1 10.10.10.2 8 msec *  8