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Core switches can be configured with IP addresses

Yes, core switches can be configured with IP addresses on their interfaces, VLANs, and management ports to enable routing, DHCP services, and network management.IP Address Assignment on Core Switches

Core switches, especially Layer 3 switches, can have IP addresses assigned to:

  • Physical interfaces connecting to routers, firewalls, or other switches to enable Layer 3 routing and connectivity between networks .
  • VLAN interfaces (SVIs), which allow the switch to route traffic between VLANs and act as a gateway for devices in those VLANs .
  • Management interfaces, providing remote access for configuration and monitoring. For example, a VLAN interface can be configured with an IP address and used as the default gateway for devices in that VLAN. Commands typically include creating the VLAN, assigning the interface, and specifying the IP address and subnet mask.
DHCP Services on Core Switches

Core switches can also function as DHCP servers, assigning IP addresses dynamically to connected devices such as PCs, IP phones, or access points . This involves:

  • Enabling DHCP service on the switch.
  • Creating DHCP pools for each VLAN or subnet.
  • Assigning default gateways and DNS servers for clients.
  • Excluding specific IP addresses (like the switch's own IP) from the DHCP pool to avoid conflicts.
Routing and Network Connectivity

When IP addresses are configured on core switches, they can participate in routing protocols like OSPF to manage traffic between different network segments . This allows the core switch to forward traffic efficiently between user networks and egress points, while also supporting VPN instances or isolated routing domains if needed.

Practical Considerations
  • Ensure IP addresses on SVIs or interfaces do not conflict with DHCP pools.
  • Enable IP routing on the core switch if it is performing Layer 3 functions.
  • Use trunk links for VLANs connecting to access switches to maintain proper VLAN tagging .
  • Core switches can serve as the gateway for both wired and wireless users, integrating DHCP and routing functions for campus networks . In summary, configuring IP addresses on core switches is standard practice for enabling routing, VLAN management, DHCP services, and network administration, making them central to both Layer 2 and Layer 3 network operations.
Core switches can be configured with IP addresses

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