Notes on Configuring Static Routes in Cisco Routers

Introduction

• Free CCNA course by Jeremy’s IT Lab
• Focus: Configure static routes on Cisco routers
• Two labs for Day 11:
  • Lab 1: Configure static routes
  • Lab 2: Troubleshoot an existing network configuration

Lab Objective

• Enable PC1 and PC2 to ping each other by configuring necessary settings.
• No pre-configurations on devices to practice basic CLI commands.

Basic Configuration Steps

PC1 Configuration

• Gateway IP: 192.168.1.254 (R1)
• Network interface (FastEthernet0): 192.168.1.1, subnet mask: 255.255.255.0

R1 Configuration

1. Enter privileged exec mode: enable
2. Enter global config mode: configure terminal
3. Set hostname: hostname R1
4. Configure Interfaces:
   • G0/1 (internal LAN):
     • IP Address: 192.168.1.254
     • Description: description ## to SW1 ##
     • Enable: no shutdown
   • G0/0 (to R2):
     • IP Address: 192.168.12.1
     • Description: description ## to R2 ##
     • Enable: no shutdown
5. Check interfaces: do show ip interface brief

R2 Configuration

1. Enter privileged exec mode: enable
2. Enter global config mode: configure terminal
3. Set hostname: hostname R2
4. Configure Interfaces:
   • G0/0 (to R1):
     • IP Address: 192.168.12.2
     • Description: description ## to R1 ##
     • Enable: no shutdown
   • G0/1 (to R3):
     • IP Address: 192.168.13.2
     • Description: description ## to R3 ##
     • Enable: no shutdown
5. Check interfaces: do show ip interface brief

R3 Configuration

1. Enter privileged exec mode: enable
2. Enter global config mode: configure terminal
3. Set hostname: hostname R3
4. Configure Interfaces:
   • G0/0 (to R2):
     • IP Address: 192.168.13.3
     • Description: description ## to R2 ##
     • Enable: no shutdown
   • G0/1 (to SW2):
     • IP Address: 192.168.3.254
     • Description: description ## to SW2 ##
     • Enable: no shutdown
5. Check interfaces: do show ip interface brief

PC2 Configuration

• Gateway IP: 192.168.3.254 (R3)
• Network interface (FastEthernet0): 192.168.3.1, subnet mask: 255.255.255.0

Configuring Static Routes

• Two-way reachability necessary for PING between PC1 and PC2
• Routes Needed:
  • R1 to 192.168.3.0/24
  • R3 to 192.168.1.0/24
  • R2 to both 192.168.1.0/24 and 192.168.3.0/24 (two routes)

R1 Static Route

1. Exit interface config mode: exit
2. Configure static route: ip route 192.168.3.0 255.255.255.0 192.168.12.2
3. Verify routing table: do show ip route

R2 Static Routes

1. Exit interface config mode: exit
2. Configure route to 192.168.1.0/24:
   • ip route 192.168.1.0 255.255.255.0 g0/0
3. Configure route to 192.168.3.0/24:
   • ip route 192.168.3.0 255.255.255.0 192.168.13.3
4. Verify routing table: do show ip route

R3 Static Route

1. Exit interface config mode: exit
2. Configure route to 192.168.1.0/24:
   • ip route 192.168.1.0 255.255.255.0 192.168.13.2
3. Verify routing table: do show ip route

Testing Connectivity

• On PC1, use command prompt and try to PING: 192.168.3.1
  • First ping may fail due to ARP, subsequent pings should succeed if configured correctly.
• Successful PING confirms static routing configuration.

Conclusion

• Successfully configured static routing to allow PC1 and PC2 to communicate.
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