Collegare Tre Router in Cisco Packet Tracer: Lab Passo dopo Passo

Lab Cisco Packet Tracer per collegare tre router con configurazione di routing di base.

Configurazione Topologia

1. Trascina 3 Router 2911 (o 1941, 4321) nell'area di lavoro
2. Etichetta: R1, R2, R3
3. Collega: R1 G0/0 → R2 G0/0 (cavo DCE)
4. Collega: R2 G0/1 → R3 G0/0 (cavo DCE)
5. Aggiungi 3 PC o Switch+PC per LAN
6. PC1 → R1 G0/1, PC2 → R2 G0/2, PC3 → R3 G0/1

Configurazione Interfacce

 R1> en R1# conf t R1(config)# int g0/0 R1(config-if)# ip address 10.1.12.1 255.255.255.252 R1(config-if)# no shut R1(config-if)# exit R1(config)# int g0/1 R1(config-if)# ip address 192.168.1.1 255.255.255.0 R1(config-if)# no shut R2> en R2# conf t R2(config)# int g0/0 R2(config-if)# ip address 10.1.12.2 255.255.255.252 R2(config-if)# clock rate 64000 R2(config-if)# no shut R2(config-if)# exit R2(config)# int g0/1 R2(config-if)# ip address 10.1.23.1 255.255.255.252 R2(config-if)# clock rate 64000 R2(config-if)# no shut R2(config)# int g0/2 R2(config-if)# ip address 192.168.2.1 255.255.255.0 R2(config-if)# no shut R3> en R3# conf t R3(config)# int g0/0 R3(config-if)# ip address 10.1.23.2 255.255.255.252 R3(config-if)# no shut R3(config-if)# exit R3(config)# int g0/1 R3(config-if)# ip address 192.168.3.1 255.255.255.0 R3(config-if)# no shut 

Configurazione Routing (Route Statiche)

 R1(config)# ip route 10.1.23.0 255.255.255.252 10.1.12.2 R1(config)# ip route 192.168.2.0 255.255.255.0 10.1.12.2 R1(config)# ip route 192.168.3.0 255.255.255.0 10.1.12.2 R2(config)# ip route 192.168.1.0 255.255.255.0 10.1.12.1 R2(config)# ip route 192.168.3.0 255.255.255.0 10.1.23.2 R3(config)# ip route 10.1.12.0 255.255.255.252 10.1.23.1 R3(config)# ip route 192.168.1.0 255.255.255.0 10.1.23.1 R3(config)# ip route 192.168.2.0 255.255.255.0 10.1.23.1 

Alternativa Routing Dinamico (OSPF)

 R1(config)# router ospf 1 R1(config-router)# network 10.1.12.0 0.0.0.3 area 0 R1(config-router)# network 192.168.1.0 0.0.0.255 area 0 ... ripeti su R2, R3 per le loro reti 

Verifica

• show ip route — controlla tutte le reti apprese
• ping 192.168.3.1 da R1 (sorgente g0/1)
• traceroute 192.168.3.1 — verifica percorso R1→R2→R3
• PC1 ping PC3 — test end-to-end

Problemi Comuni

• Mancanza clock rate lato DCE
• Mancata corrispondenza subnet su collegamenti seriali
• Route di ritorno mancanti (routing asimmetrico)
• Interfaccia non no shutdown

Salva: wr o copy run start. I file .pkt di Packet Tracer sono portatili per la valutazione.