Steps to configure the core switch

Configuring a core switch involves connecting via console, setting hostnames, securing access, configuring VLANs, assigning management IPs, and saving the configuration for network deployment.Step 1: Connect to the SwitchUse a console cable to connect your computer to the switch. Launch a terminal emulator like PuTTY and select a serial connection at 9600 baud. Verify that the switch powers on and all indicator lights are functioning properly .Step 2: Enter Privileged EXEC ModeAt the prompt, type enable to enter Privileged EXEC mode (Switch#). This mode allows you to execute configuration commands .Step 3: Set a HostnameAssign a unique hostname to the switch to identify it in the network:CodeCopySwitch(config)# hostname CoreSwitch1 This helps in managing multiple switches and maintaining a professional naming convention .Step 4: Configure PasswordsSet a strong enable secret password for privileged access:CodeCopyCoreSwitch1(config)# enable secret YourStrongPassword Also, configure passwords for console and Telnet/SSH access to secure administrative access:CodeCopyCoreSwitch1(config)# line console 0CoreSwitch1(config-line)# password ConsolePassCoreSwitch1(config-line)# loginCoreSwitch1(config-line)# exitCoreSwitch1(config)# line vty 0 4CoreSwitch1(config-line)# password TelnetPassCoreSwitch1(config-line)# loginCoreSwitch1(config-line)# exit For enhanced security, consider using AAA authentication and SSH instead of Telnet .Step 5: Configure VLANsCreate VLANs to segment network traffic:CodeCopyCoreSwitch1(config)# vlan 10CoreSwitch1(config-vlan)# name SalesCoreSwitch1(config-vlan)# exitCoreSwitch1(config)# vlan 20CoreSwitch1(config-vlan)# name ITCoreSwitch1(config-vlan)# exit Assign interfaces to VLANs:CodeCopyCoreSwitch1(config)# interface gig0/1CoreSwitch1(config-if)# switchport mode accessCoreSwitch1(config-if)# switchport access vlan 10CoreSwitch1(config-if)# exit For trunk ports carrying multiple VLANs:CodeCopyCoreSwitch1(config)# interface gig0/24CoreSwitch1(config-if)# switchport mode trunkCoreSwitch1(config-if)# switchport trunk allowed vlan 10,20CoreSwitch1(config-if)# exit Verify VLANs with show vlan brief .Step 6: Assign Management IPAssign an IP address to the management VLAN for remote access:CodeCopyCoreSwitch1(config)# interface vlan 1CoreSwitch1(config-if)# ip address 192.168.1.2 255.255.255.0CoreSwitch1(config-if)# no shutdown Set a default gateway for network connectivity:CodeCopyCoreSwitch1(config)# ip default-gateway 192.168.1.1 This allows the switch to communicate with devices outside its local subnet .Step 7: Disable Unused PortsFor security, disable unused interfaces:CodeCopyCoreSwitch1(config)# interface range gig0/2 - 23CoreSwitch1(config-if)# shutdown This prevents unauthorized access .Step 8: Save ConfigurationSave the configuration to ensure it persists after a reboot:CodeCopyCoreSwitch1# write memory orCodeCopyCoreSwitch1# copy running-config startup-config This ensures all settings, VLANs, and passwords are retained .Optional Step 9: Configure Advanced FeaturesFor core switches, you may configure Spanning Tree Protocol (STP), port security, NetFlow, or QoS to optimize network performance and security . By following these steps, your core switch will be properly configured for secure, efficient, and scalable network operation.