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Lab 2.1: Subnet Design

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Emma edited this page Sep 15, 2025 · 1 revision

Overview

In this lab we are connecting and configuring VLANs on this start file:

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Part 1: The Subnetting Table

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Part 2: Building the network

Step 1: Edge Configuration

Step 1.1: Configuring Edge Switches

  1. Add vlans to the databases => 100, 110 to all => 130 in East 02 only => 140 in West 02 only
(config)#vlan x
(config-vlan)#name <vlan name>
  1. Configure ports for those VLANs on every switch
  • VLAN 100 (FacStaff) on ports 4-12 (all switches)
  • VLAN 110 (Student) on ports 13-20 (all switches)
  • VLAN 130 (Lab1) on ports 21-24 (East-Edge-02 only)
  • VLAN 140 (Lab2) on ports 21-24 (West-Edge-02 only)
(config)interface range FastEthernet0/x-y
(config-if-range)switchport access vlan z

i.e) for East-Edge-01

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Step 1.2: Configuring End User Devices

  1. Using the IP Ranges set in the first part, configure the IPs for the end devices and add default gateways.

Step 1.3: Connect devices to Edge switch

  1. Connect Devices with copper to the ports in their VLAN range
Screenshot 2025-09-15 at 10 19 35 AM

Step 1.4: Verifying that Step 1 is done

(Note: I took these screenshots after the lab was complete so I was able to ping between VLANs on different switches)

  1. Pinging all devices in the FacStaff VLAN + a random one outside of VLAN.
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  1. Pinging all devices in the Student VLAN + a random one outside of VLAN.
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  1. Pinging all devices in the Lab1 VLAN + a random one outside of VLAN.
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Step 2: Configure Trunking

  1. Configure trunk ports for the Core switches
  • Add plans 100, 110, 130, and 140 to the vlan database on core switches
vlan x
name <name>
  1. Configure FastEthernet 0/1 and 0/2 as trunk ports for the appropriate VLANS
(config)#interface FastEthernet0/x
(config-if)#switchport mode trunk
(config-if)#switchport trunk allowed vlan add <vlan #>
  1. Configure FastEthernet 0/1 as the trunk port for relevant VLANs on the edge switches

Step 3: Connect Edge Switches to Core

  • Using copper cross-over cables connect the trunk ports between edge and core switches

Step 4: Enable Routing on EAST-Core Switch

  1. Enable Routing on East-Core Switch
(config)#ip routing
  1. Assign the router addresses from VLANS 100, 110, 130, 140 to East Core
(config)#interface vlan x
(config-if)ip address 10.11.x.x 255.x.x.x

ie).

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  1. Verification: Check if you can ping between two systems on different VLANs in EAST.
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Step 5: Configure East-West Trunk

  1. Configure Gigabit Ethernet 0/1 on East and West Core switches as trunk ports
  2. Copper Cross over cable them
  3. Verification: You should be able to ping between all devices (done)

Lab Journal Entry

How to navigate different modes on a Cisco Switch/Router

  • from Switch> enable gives you privileged access and brings you to Switch#
  • from Switch# conf t (or configure terminal) enters global configuration mode which allows you to execute commands and brings you to Switch(config)#
  • from Switch(config)# if you use an interface command such as interface FastEthernet0/1 it will bring you to Switch(config-if)
  • exit will bring you back to the previous mode

Commands to create VLANS on switch

See step 1.1.1

Setting access and trunk ports on switch

Trunk

See Step 2.2

Access

(config)#interface FastEthernet0/x
(config-if)#switchport mode access
(config-if)#switchport access vlan 100

Configure interfaces in "ranges"

See step 1.1.2

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