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Configure port IPs for the core switch

Configure port IPs for the core switch

Core switch ports can be configured as Layer 2 access ports with VLANs or Layer 3 routed ports with IP addresses, depending on the network design and device connectivity.Layer 2 Port ConfigurationFor ports connecting to servers or end devices, configure them as access ports within a specific VLAN. Assign the VLAN to the port and ensure a gateway IP is available via an SVI (Switched Virtual Interface) on the core switch. Example steps on a Cisco switch:Enter interface configuration:CodeCopyinterface GigabitEthernet0/1 switchport mode access switchport access vlan 105 spanning-tree portfast The SVI for VLAN 105 provides the IP gateway for devices in that VLAN:CodeCopyinterface Vlan105 ip address 192.168.105.1 255.255.255.0 no shutdown This setup allows multiple hosts in the VLAN to communicate and access routed networks through the SVI .Layer 3 Port ConfigurationFor uplinks to routers, firewalls, or other core switches, configure routed ports with a single IP address:CodeCopyinterface GigabitEthernet0/2 no switchport ip address 10.0.0.1 255.255.255.252 no shutdown This is suitable for point-to-point links where the port itself acts as a Layer 3 interface .VLAN and VPN Instance ConsiderationsCreate interconnection VLANs for links to BRASs, firewalls, or other core devices.Bind VLANIF interfaces to a VPN instance if network segmentation is required, isolating public and private routes .Example for Huawei switches:CodeCopyvlan 10 interface Vlanif10 ip address 192.168.10.1 255.255.255.0 vpn-instance vpn1 Routing and ConnectivityConfigure OSPF or static routes on the core switch to ensure connectivity between VLANs and egress networks.Assign a default route pointing to the egress router for external traffic .Ensure VLAN interfaces have IP addresses for inter-VLAN routing.Best PracticesUse spanning-tree portfast on access ports to reduce downtime during link flaps.Avoid using VLAN 1 for management; create a dedicated management VLAN.For trunk ports connecting switches, configure allowed VLANs and disable DTP negotiation:CodeCopyinterface GigabitEthernet0/24 switchport mode trunk switchport trunk allowed vlan 10,20,30 switchport nonegotiate Verify configuration with show ip interface brief and ping tests to confirm connectivity. By following these steps, you can properly assign IPs to core switch ports, configure VLANs, and ensure both Layer 2 and Layer 3 connectivity for servers, firewalls, and inter-switch links.

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