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Lab — Inter-VLAN Routing
1 router (R1) + 1 switch (SW1) con VLAN 10, 20, 99. Router-on-a-stick: configura trunk, sotto-interfacce dot1Q, IP gateway. PC di VLAN diverse devono comunicare.
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Router-on-a-Stick
R1
Gi0/0 (trunk)
Gi0/0 (trunk)
— trunk 802.1Q —
SW1
SW1 porte pre-configurate:
Fa0/1 = trunk verso R1
Fa0/2 = VLAN 10 (access) → PC1: 192.168.10.10
Fa0/3 = VLAN 20 (access) → PC2: 192.168.20.10
Fa0/4 = VLAN 99 (access) → PC3: 192.168.99.10
R1 sotto-interfacce da configurare:
Gi0/0.10 → encap dot1Q 10, IP 192.168.10.1/24
Gi0/0.20 → encap dot1Q 20, IP 192.168.20.1/24
Gi0/0.99 → encap dot1Q 99, IP 192.168.99.1/24
Fa0/1 = trunk verso R1
Fa0/2 = VLAN 10 (access) → PC1: 192.168.10.10
Fa0/3 = VLAN 20 (access) → PC2: 192.168.20.10
Fa0/4 = VLAN 99 (access) → PC3: 192.168.99.10
R1 sotto-interfacce da configurare:
Gi0/0.10 → encap dot1Q 10, IP 192.168.10.1/24
Gi0/0.20 → encap dot1Q 20, IP 192.168.20.1/24
Gi0/0.99 → encap dot1Q 99, IP 192.168.99.1/24
1SW1: Crea le VLAN
vlan 10 → name Vendite
vlan 20 → name IT
vlan 99 → name Management
vlan 20 → name IT
vlan 99 → name Management
2SW1: Trunk verso R1
int fa0/1 → switchport mode trunk
switchport trunk allowed vlan 10,20,99
switchport trunk allowed vlan 10,20,99
3R1: Interfaccia fisica up
int Gi0/0 → no shutdown
⚠️ Niente IP sull'interfaccia fisica!
⚠️ Niente IP sull'interfaccia fisica!
4R1: Sotto-interfacce
int Gi0/0.10 → encapsulation dot1Q 10 → ip address 192.168.10.1 255.255.255.0
Ripeti per .20 e .99
Ripeti per .20 e .99
5Verifica e test
show vlans su R1 (vede le sub-if)
show vlan brief su SW1
Da PC1: ping 192.168.20.10 (cross-VLAN!)
show vlan brief su SW1
Da PC1: ping 192.168.20.10 (cross-VLAN!)
💡 L'interfaccia fisica Gi0/0 deve essere up (no shutdown) ma NON ha un IP. Gli IP stanno solo sulle sotto-interfacce!
R1 — Console
R1
SW1
PC1
PC2
PC3
R1>