how to configred three routers cisco 2620 with console cablee with ip routing steps as follows below 2026

 how to configred three routers cisco 2620 with console cablee with ip routing steps as follows below 2026

Network Topology Example

We will configure three Cisco 2620 Router routers using serial connections and static IP routing.

Topology

PC ---- R1 ---- R2 ---- R3 ---- PC

Router	Interface	IP Address	Connected To
R1	Fa0/0	192.168.1.1/24	PC1
R1	S0/0	10.0.0.1/30	R2
R2	S0/0	10.0.0.2/30	R1
R2	S0/1	20.0.0.1/30	R3
R3	S0/0	20.0.0.2/30	R2
R3	Fa0/0	192.168.3.1/24	PC2

---

Step 1: Connect the Routers

Use:

• Console cable from PC to router console port

• Serial DCE/DTE cable between routers

• Ethernet cable for PCs

Example:

• R1 S0/0 ↔ R2 S0/0

• R2 S0/1 ↔ R3 S0/0

---

Step 2: Open Cisco CLI

Using:

• HyperTerminal

• PuTTY

• Tera Term

Console settings:

9600 baud
8 data bits
No parity
1 stop bit
No flow control

---

Step 3: Configure Router R1

enable
configure terminal

hostname R1

interface fastethernet0/0
ip address 192.168.1.1 255.255.255.0
no shutdown
exit

interface serial0/0
ip address 10.0.0.1 255.255.255.252
clock rate 64000
no shutdown
exit

ip route 192.168.3.0 255.255.255.0 10.0.0.2

end
write memory

---

Step 4: Configure Router R2

enable
configure terminal

hostname R2

interface serial0/0
ip address 10.0.0.2 255.255.255.252
no shutdown
exit

interface serial0/1
ip address 20.0.0.1 255.255.255.252
clock rate 64000
no shutdown
exit

ip route 192.168.1.0 255.255.255.0 10.0.0.1
ip route 192.168.3.0 255.255.255.0 20.0.0.2

end
write memory

---

Step 5: Configure Router R3

enable
configure terminal

hostname R3

interface fastethernet0/0
ip address 192.168.3.1 255.255.255.0
no shutdown
exit

interface serial0/0
ip address 20.0.0.2 255.255.255.252
no shutdown
exit

ip route 192.168.1.0 255.255.255.0 20.0.0.1

end
write memory

---

Step 6: Configure PCs

PC1

IP Address: 192.168.1.2
Subnet Mask: 255.255.255.0
Gateway: 192.168.1.1

PC2

IP Address: 192.168.3.2
Subnet Mask: 255.255.255.0
Gateway: 192.168.3.1

---

Step 7: Verify Configuration

Check Interfaces

show ip interface brief

Check Routing Table

show ip route

Test Connectivity

From PC1:

ping 192.168.3.2

If replies are received, routing is working successfully.

---

Important Notes

• Apply clock rate 64000 only on the DCE serial interface.

• Use no shutdown on all interfaces.

• Save configuration using:

write memory

or

copy running-config startup-config

---

Simple Network Diagram

192.168.1.0/24                    192.168.3.0/24

PC1 --- R1 ===== R2 ===== R3 --- PC2
        10.0.0.0     20.0.0.0

Where:

• ===== = Serial cable connection

• --- = Ethernet connection