Connecting Cisco Router and Switch via Router on a Stick

Introduction

• Presenter: Abdul Basit
• Topic: Connecting Cisco router and switch using the Router on a Stick method.
• Previous video received good feedback, motivating this presentation.

Key Concepts

• Router on a Stick:

  • Only one link between router and switch.
  • Uses Cisco router for inter-VLAN routing when no Layer 3 switch is available.
  • The method involves creating sub-interfaces on the router's physical interface connected to the switch.

• Equipment Used:

  • Router: Cisco 2800 series
  • Switch: Cisco 2960 G-switch

Network Diagram

• Setup:
  • Link between Cisco router and switch is an 802.1q trunk link.
  • Multiple VLANs (10, 20, 30) will travel on this link.

Configuration Steps

1. Router Configuration:

   • FastEthernet 0/0:
     • Connect to home ISP router (configured for DHCP).
   • FastEthernet 0/1:
     • Configured for sub-interfaces based on the number of VLANs.

2. Sub-Interface Setup:

   • Create sub-interfaces for VLANs 10, 20, and 30.
   • Example command for VLAN 10:

     interface fastethernet 0/1.10  
     encapsulation dot1Q 10  
     ip address 10.10.10.1 255.255.255.0  
     

3. Static Routing:

   • Add static route to the gateway (ISP router).
   • Command: ip route 0.0.0.0 0.0.0.0 192.168.1.1

4. DHCP Configuration:

   • Configure DHCP pools for each VLAN.
   • Example for VLAN 10:
     • Pool name: 10
     • Network: 10.10.10.0/24
     • Default Route: 10.10.10.1
     • DNS Server: 8.8.8.8

5. NAT Configuration:

   • Enable NAT for interfaces:
     • ip nat outside on FastEthernet 0/0
     • ip nat inside on sub-interfaces.

6. Access List Configuration:

   • Configure access lists to permit VLAN networks.

7. Switch Configuration:

   • Configure trunk port (Gig0/48) between router and switch.
   • Create VLANs (10, 20, 30) on the switch and assign IP addresses.
   • Assign interfaces to corresponding VLANs.

Testing and Validation

• Connect laptops to switch ports corresponding to VLANs 10 and 20.
• Ensure DHCP IP assignment and internet connectivity.
• Validate intra-VLAN connectivity by pinging between laptops on different VLANs.

Conclusion

• Successfully configured a Cisco router and switch using the Router on a Stick method.
• Functionality:
  • Internet access is operational from both VLANs.
  • Intra-VLAN communication is successful.

Closing

• Encouraged viewers to like and subscribe for more videos.
• Invitation for comments and suggestions for future topics.