genera un controlador ryu que realize enrutamiento intervlans de la vlan 20 a la vlan 30 para mininet

Aquí te muestro un ejemplo de cómo crear un controlador Ryu que realice enrutamiento intervlans entre la VLAN 20 y la VLAN 20 a la VLAN 30 en Mininet:

Primero, debes instalar Ryu y Mininet en tu sistema. Puedes hacerlo ejecutando los siguientes comandos:

```bash
sudo apt-get update
sudo apt-get install ryu
sudo apt-get install mininet
```

Luego, crea un archivo llamado `vlan_routing.py` con el siguiente contenido:

```python
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER, DEAD_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import vlan
from ryu.lib.packet import ipv4
from ryu.topology import event
from ryu.topology.api import get_link, get_switch, get_controller
from ryu.topology.event import TopologyEvent
from ryu.controller import dpset
from ryu.controller import dpset
from ryu.controller import event
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.controller.handler import CONFIG_DISPATCHER
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