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How to change the core switch configuration

Fiber and communications infrastructure knowledge brief Published 12 Jul 2026

Use this reference to prepare product questions for BAGYOU FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Configuring a core switch involves initial setup, VLAN creation, management access, security settings, and optional advanced features like NetFlow. Step 1: Physical Setup and Console AccessVerify the switch hardware and cables for damage and power it on, ensuring all indicator lights function correctly. Connect to the switch using a console cable and terminal software like PuTTY, selecting a 9600 baud serial connection.

Step 2: Enter Privileged EXEC and Global Configuration ModeAt the prompt, type enable to enter Privileged EXEC mode (Switch#). Enter Global Configuration mode with configure terminal to start configuring system-wide settings. Step 3: Set Hostname and Domain NameAssign a hostname to identify the switch in the network: hostname CoreSwitch1.

Configure a domain name if needed for SSH: ip domain-name example.com. Step 4: Configure Passwords and Access ControlSet a strong enable password: enable secret YourStrongPassword. Configure console and VTY (Telnet/SSH) line passwords: CodeCopyline console 0password YourConsolePasswordloginexitline vty 0 4password YourVTYPasswordlogintransport input sshexit Optionally, configure local AAA authentication for centralized access control.

Step 5: Assign Management IP AddressAssign an IP address to the management VLAN (usually VLAN 1 or a dedicated management VLAN): CodeCopyinterface vlan 1ip address 192. 168. 1.

10 255. 255. 255.

0no shutdownexit Set a default gateway for remote management: ip default-gateway 192. 168. 1.

1. Step 6: Configure VLANs and Port AssignmentsCreate VLANs as needed: vlan 10 and vlan 20, then name them appropriately. Assign interfaces to VLANs: CodeCopyinterface gigabitEthernet0/1switchport mode accessswitchport access vlan 10exitinterface gigabitEthernet0/24switchport mode trunkswitchport trunk allowed vlan 10,20exit Verify VLANs with show vlan brief.

Step 7: Disable Unused PortsShut down unused interfaces to enhance security: CodeCopyinterface range gigabitEthernet0/2-23shutdownexit Step 8: Enable Optional FeaturesConfigure NetFlow or other monitoring tools for traffic analysis. Enable Spanning Tree Protocol (STP) to prevent loops if multiple switches are connected. Configure port security and access control lists (ACLs) as needed.

Step 9: Save ConfigurationSave the running configuration to startup configuration to ensure persistence after reboot: CodeCopywrite memory orCodeCopycopy running-config startup-config Step 10: VerificationUse commands like show running-config, show vlan brief, show ip interface brief, and ping to verify connectivity and correct configuration. Following these steps ensures that your core switch is secure, manageable, and ready for integration into your network infrastructure.

How to change the core switch configuration - BAGYOU FIBRE NETWORKS [PDF]

How to change the core switch configuration

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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