How to configure the gateway IP on a core switch

To configure a gateway IP on a core switch, assign an IP to a VLAN interface and set the default gateway using the ip default-gateway command.Step 1: Access the Switch CLIConnect to the switch using a console cable or SSH. Enter Enable mode by typing enable and providing the necessary password . Then enter Global Configuration mode with configure terminal.Step 2: Assign an IP Address to a VLAN InterfaceSince Layer 2 switch ports cannot have IP addresses, you need to configure a Switched Virtual Interface (SVI), usually VLAN 1 or a management VLAN:CodeCopySwitch(config)# interface vlan 1Switch(config-if)# ip address 192.168.1.10 255.255.255.0Switch(config-if)# no shutdown This IP allows the switch to be managed via Telnet, SSH, or web GUI .Step 3: Configure the Default GatewayThe default gateway is the router or Layer 3 switch IP that connects the switch's subnet to other networks. Configure it with:CodeCopySwitch(config)# ip default-gateway 192.168.1.1 This ensures the switch can communicate with devices outside its local subnet . Without this, the switch can only reach hosts in the same VLAN or subnet.Step 4: Verify the ConfigurationCheck the IP and gateway settings using:CodeCopySwitch# show running-configSwitch# show ip route The show ip route command should display a default route (0.0.0.0/0) pointing to the configured gateway . You can also test connectivity with ping 192.168.1.1 to ensure the switch can reach the gateway.Additional ConsiderationsEnsure the gateway IP is in the same subnet as the switch's SVI.For Layer 3 switches, you can also configure routing instead of ip default-gateway if the switch participates in inter-VLAN routing.Save the configuration to NVRAM to retain it after a reboot using write memory or copy running-config startup-config .By following these steps, your core switch will be able to manage traffic beyond its local VLAN and communicate with other networks efficiently.