Disable a specific IP address from accessing the switch

You can disable an IP address on a switch by either removing the IP from the VLAN interface or administratively disabling Layer 3 routing on the VLAN.Removing or Disabling the IP AddressUsing CLI to Remove IP from VLAN Interface On many managed switches, you can remove the IP address assigned to a VLAN interface. For example, on a Cisco or Cambium switch:Enter global configuration mode: configure terminalSelect the VLAN interface: interface vlan 1Remove the IP address: no ip addressExit configuration mode: end This effectively disables the switch's IP for management or routing purposes while keeping the VLAN active for Layer 2 switching .Disabling Layer 3 Routing on VLANs Some switches, like Aruba or HPE models, allow you to administratively disable IP functionality without removing the Layer 3 configuration:Use the command or management interface to toggle Layer 3 routing inactive on the VLAN.The switch continues Layer 2 switching but will not respond to IP traffic on that VLAN until re-enabled .Removing Default Gateway (Optional) If the switch has a default gateway configured, you can remove it to prevent routing to external networks:Enter global configuration mode: configure terminalRemove the default gateway: no ip default-gateway [gateway-ip] This ensures the switch does not forward traffic outside its local subnet .Additional ConsiderationsDHCP-Assigned IPs: If the switch is using DHCP, disable it first with no ip address dhcp before assigning or removing a static IP .Backup VLANs: Disabling IP on a VLAN can be useful for backup configurations, allowing quick reactivation of Layer 3 routing when needed .Saving Configuration: After making changes, save the configuration to ensure the IP remains disabled after a reboot, typically with write memory or copy running-config startup-config. By following these steps, you can effectively disable the IP address on a switch while maintaining Layer 2 functionality or preparing the VLAN for backup routing.

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Disable a specific IP address from accessing the switch