Vlan

Configuración de VLANs con Cisco
En este post mostraré cómo crear VLANs en un switch Cisco, configurar puertos de acceso y puertos de trunk y rutear las VLANs para que puedan comunicarse entre sí. El ruteo se hace con el método de router-on-stick.
Ambiente

La asignación de VLANs quedará:
• VLAN4: 192.168.4.0/24.
• Switch0: puertos 1 al 9.
• Switch1: puertos 1 al 9.
• VLAN5:192.168.5.0/24.
• Switch0: puertos 9, 10, 12.
• Switch1: puertos 10 al 14.
• TRUNK
• Switch0: fastEthernet 0/11, gigabitEthernet 1/1.
• Switch1: gigabitEthernet 1/1.
• Router0: fastEthernet 0/0.
Creación de las VLAN
sw0(config)# interface vlan 4
sw0(config-if)# description Vlan4
sw0(config-if)# no shutdown

sw0(config)# interface vlan 5
sw0(config-if)# description Vlan5
sw0(config-if)# noshutdown

sw1(config)# interface vlan 4
sw1(config-if)# description Vlan4
sw1(config-if)# no shutdown

sw1(config)# interface vlan 5
sw1(config-if)# description Vlan5
sw1(config-if)# no shutdown
Asignar puertos a las VLAN
sw0(config)#interface range fastEthernet 0/1 - fastEthernet 0/8
sw0(config-if-range)#switchport mode access
sw0(config-if-range)#switchport access vlan 4sw0(config-if-range)#exit

sw0(config)#interface range fastEthernet 0/9, fastEthernet 0/10, fastEthernet0/12
sw0(config-if-range)#switchport mode access
sw0(config-if-range)#switchport access vlan 5
sw0(config-if-range)#exit

sw1(config)#interface range fastEthernet 0/1 - fastEthernet 0/9
sw1(config-if-range)#switchport mode access
sw1(config-if-range)#switchport access vlan 4
sw1(config-if-range)#exitsw1(config)#interface range fastEthernet 0/10 - fastEthernet 0/14
sw1(config-if-range)#switchport mode access
sw1(config-if-range)#switchport access vlan 5
sw1(config-if-range)#exit
Configurar los puertos de Trunk
sw0(config)#interface fastEthernet 0/11
sw0(config-if)#switchport mode trunk
sw0(config-if)#switchport trunk encapsulation dot1q
sw0(config-if)#switchport trunk allowed vlan4,5
sw0(config-if)#exit

sw0(config)#interface gigabitEthernet 1/1
sw0(config-if)#switchport mode trunk
sw0(config-if)#switchport trunk encapsulation dot1q
sw0(config-if)#switchport trunk allowed vlan 4,5
sw0(config-if)#exit

sw1(config)#interface gigabitEthernet 1/1
sw1(config-if)#switchport mode trunk
sw0(config-if)#switchport trunk encapsulation dot1q
sw1(config-if)#switchport trunkallowed vlan 4,5
sw1(config-if)#exit
Ruteo entre VLANs
central(config)#interface fastEthernet 0/0
central(config-if)#no shutdown
central(config-if)#exit

central(config)# interface fastEthernet 0/0.4
central(config-if)# encapsulation dot1Q 4
central(config-if)# ip address 192.168.4.1 255.255.255.0
exit

central(config)# interface fastEthernet 0/0.5
central(config-if)# encapsulationdot1Q 5
central(config-if)# ip address 192.168.5.1 255.255.255.0
exit
Verificación de la configuración de las VLAN
sw1#show vlan brief

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/15, Fa0/16, Fa0/17, Fa0/18
Fa0/19, Fa0/20, Fa0/21, Fa0/22
Fa0/23,Fa0/24, Gig1/2
4 VLAN0004 active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9
5 VLAN0005 active Fa0/10, Fa0/11, Fa0/12, Fa0/13
Fa0/14
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default activesw1#show vlan id 4

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
4 VLAN0004 active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ --------...