How to access the core routing switch

To enable routing on a core switch, you must activate IP routing, configure Layer 3 interfaces (SVIs or routed ports), and optionally set up routing protocols.Steps to Enable Routing1. Enable IP Routing On most Layer 3 switches, IP routing is disabled by default. Enter global configuration mode and enable it using the command:CodeCopySwitch(config)# ip routing This allows the switch to route traffic between VLANs or subnets rather than just switching at Layer 2 . 2. Configure Layer 3 InterfacesSVIs (Switched Virtual Interfaces): For VLANs, create an SVI and assign an IP address:CodeCopySwitch(config)# interface vlan 10Switch(config-if)# ip address 192.168.10.1 255.255.255.0Switch(config-if)# no shutdown Routed Ports: Convert a Layer 2 port to Layer 3 by disabling switchport mode and assigning an IP:CodeCopySwitch(config)# interface gigabitEthernet 1/0/1Switch(config-if)# no switchportSwitch(config-if)# ip address 10.0.0.1 255.255.255.0Switch(config-if)# no shutdown This is useful for point-to-point links between core switches or routers . 3. Configure Routing Protocols (Optional) If dynamic routing is required, enable a routing protocol such as OSPF or EIGRP:CodeCopySwitch(config)# router ospf 1Switch(config-router)# network 192.168.10.0 0.0.0.255 area 0 Static routes can also be configured for specific subnets:CodeCopySwitch(config)# ip route 172.16.0.0 255.255.0.0 10.0.0.2 This ensures proper routing between multiple core switches and remote sites . 4. Verify Configuration Check that routing is active and interfaces are up:CodeCopySwitch# show ip routeSwitch# show ip interface brief Ensure that all SVIs and routed ports are operational and reachable. 5. Save Configuration To retain the configuration after a reboot:CodeCopySwitch# copy running-config startup-config Best Practices for Core Switch RoutingUse SVIs for VLAN routing and routed ports for point-to-point links between core switches or routers .Ensure redundancy with HSRP or VRRP if multiple core switches are deployed.Allow only necessary VLANs on trunk links to reduce unnecessary broadcast traffic.Monitor routing tables and interface status regularly to prevent misconfigurations. By following these steps, your core switch will be able to perform Layer 3 routing efficiently, supporting inter-VLAN communication and integration with other network devices .