Configuration of Security Core Switch

Configuring a core security switch involves initial setup, VLAN and port configuration, management IP assignment, and implementing security best practices like SSH, AAA, and SNMP controls.Initial Access and Basic SetupConnect to the switch using a console cable or SSH if already configured. Use a terminal emulator like PuTTY or Tera Term to access the CLI .Power on the switch and verify indicator lights to ensure hardware functionality .Set a hostname and domain name for the switch to identify it on the network .Assign a management IP address on the management VLAN to allow remote administration .Set privileged EXEC mode password using enable secret with strong encryption to secure administrative access .VLAN and Port ConfigurationCreate VLANs to segment network traffic and limit broadcast domains using vlan database commands .Assign ports to VLANs: Access ports for single VLANs and trunk ports for multiple VLANs .Configure Spanning Tree Protocol (STP) to prevent loops in the network .Disable unused ports to reduce attack surfaces .Security HardeningEnable SSH access and disable Telnet to secure remote management .Configure AAA (Authentication, Authorization, Accounting) using TACACS+ or RADIUS for centralized user management .Encrypt all passwords with service password-encryption to prevent exposure in configuration files .Configure SNMP securely: Use strong community strings, restrict access to management hosts, and apply ACLs .Apply access control lists (ACLs) to limit traffic to critical management interfaces .Final StepsAssign a default gateway for the switch to communicate outside its subnet .Save the configuration using write memory or copy running-config startup-config to ensure changes persist after reboot .Optionally configure NetFlow or other monitoring tools to track traffic and detect anomalies . By following these steps, your core switch will be secure, manageable, and optimized for network performance, providing a strong foundation for your LAN infrastructure.