how to configured three routers cisco 1841 leased line configuation with console cable

 

Configure Three Cisco 1841 Routers with Leased Line Using Console Cable

This guide explains how to connect and configure three Cisco 1841 Integrated Services Router routers using:

• Console cable

• Serial leased line connection

• Static routing

• IP addressing

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Network Topology

PC1 ---- R1 ---- R2 ---- R3 ---- PC2

Interface Connections

Router	Interface	Connected To
R1	Serial0/0/0	R2 Serial0/0/0
R2	Serial0/0/1	R3 Serial0/0/0
R1	FastEthernet0/0	LAN1
R3	FastEthernet0/0	LAN2

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IP Addressing Table

Device	Interface	IP Address	Subnet Mask
R1	Fa0/0	192.168.1.1	255.255.255.0
R1	S0/0/0	10.0.0.1	255.255.255.252
R2	S0/0/0	10.0.0.2	255.255.255.252
R2	S0/0/1	20.0.0.1	255.255.255.252
R3	S0/0/0	20.0.0.2	255.255.255.252
R3	Fa0/0	192.168.2.1	255.255.255.0

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Required Devices

• 3 Cisco 1841 Routers

• Console cable

• Serial DCE/DTE cables

• 2 PCs

• Power cables

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Step 1: Connect Console Cable

Connect the console cable from PC to router console port.

Open:

• PuTTY

• Tera Term

• HyperTerminal

Console settings:

Setting	Value
Speed	9600
Data bits	8
Parity	None
Stop bits	1
Flow control	None

---

Step 2: 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 serial0/0/0
ip address 10.0.0.1 255.255.255.252
clock rate 64000
no shutdown
exit

ip route 192.168.2.0 255.255.255.0 10.0.0.2

end
write memory

---

Step 3: Configure Router R2

enable
configure terminal

hostname R2

interface serial0/0/0
ip address 10.0.0.2 255.255.255.252
no shutdown
exit

interface serial0/0/1
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 192.168.2.0 255.255.255.0 20.0.0.2

end
write memory

---

Step 4: Configure Router R3

enable
configure terminal

hostname R3

interface fastethernet0/0
ip address 192.168.2.1 255.255.255.0
no shutdown
exit

interface serial0/0/0
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

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Step 5: Configure PCs

PC1

IP Address : 192.168.1.2
Subnet Mask: 255.255.255.0
Gateway    : 192.168.1.1

PC2

IP Address : 192.168.2.2
Subnet Mask: 255.255.255.0
Gateway    : 192.168.2.1

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Step 6: Verify Configuration

Check Interfaces

show ip interface brief

Check Routing Table

show ip route

Test Connectivity

From PC1:

ping 192.168.2.2

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Important Notes

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

• Use no shutdown on all interfaces.

• Save configuration using:

write memory

---

Expected Result

After configuration:

✅ R1 communicates with R2
✅ R2 communicates with R3
✅ PC1 can ping PC2 through leased line network
✅ Static routing works correctly

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