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Lab 2 — Trunk & Inter-VLAN
Configura trunk tra SW1↔SW2 e SW1↔R1. Poi configura Router-on-a-Stick su R1 per far comunicare VLAN 10 e VLAN 20.
0%
VLAN 10: 192.168.10.0/24 — VLAN 20: 192.168.20.0/24
🖥️
PC1
.10.10
SW1 Fa0/1
PC1
.10.10
SW1 Fa0/1
🖧
SRV1
.20.10
SW1 Fa0/2
SRV1
.20.10
SW1 Fa0/2
│ │
🔀 SW1
Fa0/1-2 (access)
Gi0/1 → SW2 (trunk)
Gi0/2 → R1 (trunk)
Fa0/1-2 (access)
Gi0/1 → SW2 (trunk)
Gi0/2 → R1 (trunk)
│ Gi0/1 Trunk │ Gi0/2 Trunk
🔀 SW2
Fa0/1-2 (access)
Gi0/1 → SW1 (trunk)
Fa0/1-2 (access)
Gi0/1 → SW1 (trunk)
🌍 R1
Gi0/0 → SW1 (trunk)
Gi0/0.10 → .10.1
Gi0/0.20 → .20.1
Gi0/0 → SW1 (trunk)
Gi0/0.10 → .10.1
Gi0/0.20 → .20.1
│ │
🖥️
PC2
.10.20
SW2 Fa0/1
PC2
.10.20
SW2 Fa0/1
🖧
SRV2
.20.20
SW2 Fa0/2
SRV2
.20.20
SW2 Fa0/2
1VLAN su SW1 e SW2
Su ciascuno switch:
vlan 10 → name UFFICIO → exit
vlan 20 → name SERVER → exit
vlan 10 → name UFFICIO → exit
vlan 20 → name SERVER → exit
2Access ports su SW1
int Fa0/1 → switchport mode access → switchport access vlan 10
int Fa0/2 → switchport mode access → switchport access vlan 20
int Fa0/2 → switchport mode access → switchport access vlan 20
3Access ports su SW2
Stesso procedimento: Fa0/1 → VLAN 10, Fa0/2 → VLAN 20.
4Trunk SW1 ↔ SW2
Su SW1:
int Gi0/1 → switchport mode trunk → switchport trunk allowed vlan 10,20
Su SW2:
int Gi0/1 → switchport mode trunk → switchport trunk allowed vlan 10,20
int Gi0/1 → switchport mode trunk → switchport trunk allowed vlan 10,20
Su SW2:
int Gi0/1 → switchport mode trunk → switchport trunk allowed vlan 10,20
5Trunk SW1 ↔ R1
Su SW1:
int Gi0/2 → switchport mode trunk → switchport trunk allowed vlan 10,20
int Gi0/2 → switchport mode trunk → switchport trunk allowed vlan 10,20
6Router-on-a-Stick su R1
Passa a R1:
int Gi0/0 → no shutdown
int Gi0/0.10 → encapsulation dot1Q 10 → ip address 192.168.10.1 255.255.255.0
int Gi0/0.20 → encapsulation dot1Q 20 → ip address 192.168.20.1 255.255.255.0
int Gi0/0 → no shutdown
int Gi0/0.10 → encapsulation dot1Q 10 → ip address 192.168.10.1 255.255.255.0
int Gi0/0.20 → encapsulation dot1Q 20 → ip address 192.168.20.1 255.255.255.0
7Test inter-VLAN
Da PC1:
ping 192.168.10.20 → ✅ (stessa VLAN via trunk)
ping 192.168.20.10 → ✅ (inter-VLAN via router!)
ping 192.168.10.20 → ✅ (stessa VLAN via trunk)
ping 192.168.20.10 → ✅ (inter-VLAN via router!)
💡 Router-on-a-Stick: R1 ha 1 interfaccia fisica (Gi0/0) ma 2 sub-interface (.10 e .20), ognuna in una VLAN diversa. Il trunk porta i frame taggati al router che li instrada. Funziona ma il router è un bottleneck — per le grandi reti si usa lo Switch L3.
SW1 — Console
SW1
SW2
R1
PC1
PC2
SRV1
SRV2
Switch>