how to configured three routers cisco 2620 dynamic ip address with ip routing steps as follows 2026

bygolla bala prathap -
0

 how to configured three routers cisco 2620 dynamic ip address with ip routing steps as follows 2026

Configure Three Cisco 2620 Routers with Dynamic Routing (RIP)

This guide explains how to connect and configure three Cisco 2620 routers using dynamic IP routing with RIP version 2.

Network Topology

PC1 ---- Router1 ---- Router2 ---- Router3 ---- PC2

Example IP Addressing:

DeviceInterfaceIP AddressSubnet Mask
Router1FastEthernet0/0192.168.1.1255.255.255.0
Router1Serial0/010.0.0.1255.255.255.252
Router2Serial0/010.0.0.2255.255.255.252
Router2Serial0/120.0.0.1255.255.255.252
Router3Serial0/020.0.0.2255.255.255.252
Router3FastEthernet0/0192.168.2.1255.255.255.0

Step 1: Connect Routers

Use:

  • Console cable for initial configuration

  • Serial DCE/DTE cables between routers

  • Ethernet cable to PCs/switches

Example:

  • Router1 S0/0 ↔ Router2 S0/0

  • Router2 S0/1 ↔ Router3 S0/0

Step 2: Access Router CLI

Connect console cable from PC to router.

Open:

  • PuTTY

  • Tera Term

  • HyperTerminal

Settings:

  • Speed: 9600

  • Data bits: 8

  • Parity: None

  • Stop bits: 1

Press Enter.

Step 3: Configure Router1

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

Configure RIP Routing on Router1

router rip
version 2
network 192.168.1.0
network 10.0.0.0
no auto-summary
exit

Save configuration:

copy running-config startup-config

Step 4: Configure Router2

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

Configure RIP Routing on Router2

router rip
version 2
network 10.0.0.0
network 20.0.0.0
no auto-summary
exit

Save configuration:

copy running-config startup-config

Step 5: Configure Router3

enable
configure terminal

hostname R3

interface fastethernet0/0
ip address 192.168.2.1 255.255.255.0
no shutdown
exit

interface serial0/0
ip address 20.0.0.2 255.255.255.252
no shutdown
exit

Configure RIP Routing on Router3

router rip
version 2
network 20.0.0.0
network 192.168.2.0
no auto-summary
exit

Save configuration:

copy running-config startup-config

Step 6: Configure PCs

PC1

IP Address: 192.168.1.2
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1

PC2

IP Address: 192.168.2.2
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.2.1

Step 7: Verify Routing

Check Interfaces

show ip interface brief

All interfaces should show:

up up

Check Routing Table

show ip route

You should see RIP routes marked with:

R

Step 8: Test Connectivity

From PC1:

ping 192.168.2.2

If configuration is correct, replies will succeed.

Useful Cisco Commands

CommandPurpose
show running-configView current configuration
show ip routeView routing table
show ip protocolsView RIP information
show controllers serial 0/0Check DCE/DTE cable
copy running-config startup-configSave configuration

Important Notes

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

  • Use no shutdown on every interface.

  • RIP supports small networks.

  • For better performance in large networks, use:

    • OSPF

    • EIGRP

Example RIP Dynamic Routing Formula

Dynamic routing automatically learns routes:

RIP\ Distance\ Metric = Hop\ Count

RIP selects the route with the lowest hop count.

You may like these posts

Post a Comment

Previous Post Next Post