The port connected to the Layer 3 switch is

A Layer 3 switch port is a physical or virtual interface on a switch configured to perform IP routing, connecting networks or VLANs rather than just forwarding Ethernet frames.OverviewA Layer 3 switch port differs from a traditional Layer 2 port in that it operates at the network layer (Layer 3) of the OSI model, using IP addresses to make forwarding decisions instead of just MAC addresses . Layer 3 ports enable inter-VLAN routing, allowing devices in different VLANs to communicate without requiring an external router . These ports can be physical interfaces, called routed ports, or virtual interfaces, known as Switched Virtual Interfaces (SVIs), which connect VLANs to the switch's internal routing engine .Types of Layer 3 PortsRouted Ports: Physical switch ports configured as Layer 3 interfaces. They do not participate in Layer 2 operations like Spanning Tree Protocol (STP) and are ideal for point-to-point links between switches, routers, or firewalls. Routed ports create separate Layer 3 segments, confining broadcast traffic to their subnet .Switched Virtual Interfaces (SVIs): Virtual interfaces that connect VLANs to the switch's internal router. SVIs allow Layer 3 routing for all devices within a VLAN and require at least one active Layer 2 port in the VLAN to function .Configuration and UseTo configure a Layer 3 port, you typically:Convert the port from Layer 2 to Layer 3 using commands like no switchport on Cisco devices .Assign an IP address to the port or SVI to enable routing.Enable routing protocols if dynamic routing is required.Optionally configure subinterfaces for VLAN tagging on a routed interface, allowing multiple Layer 3 subnets on a single physical port . Layer 3 ports are commonly used in core or distribution layers of enterprise networks to optimize inter-VLAN traffic, reduce reliance on external routers, and improve throughput and latency for high-density LAN environments .Key BenefitsHigh-speed routing within LANs without external routers.Segmentation and security through VLANs and ACLs.Simplified network design by combining switching and routing in one device.Efficient traffic management for latency-sensitive applications like VoIP or real-time media . In summary, a Layer 3 switch port transforms a switch from a simple frame-forwarding device into a routing-capable network node, enabling efficient communication between VLANs and subnets while maintaining high-speed switching performance.