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How to add an IP address to a core switch

To add an IP address to a core switch, configure a VLAN interface, assign the IP address and subnet mask, enable the interface, and optionally set a default gateway.Steps to Configure an IP Address on a Core Switch

1. Access the Switch CLI Connect to the switch via console cable, SSH, or Telnet. Enter privileged EXEC mode using the enable command and then enter global configuration mode with configure terminal . 2. Configure a VLAN Interface Most switches use a VLAN interface (commonly VLAN 1) as the management interface. Enter VLAN configuration mode:

interface vlan 1

Assign the IP address and subnet mask:

ip address

Enable the interface:

no shutdown

This allows the switch to communicate over the network . 3. Set a Default Gateway (Optional) If the switch needs to communicate outside its local subnet, configure a default gateway:

ip default-gateway

This ensures proper routing for management traffic . 4. Configure Interfaces for Core Connectivity (Optional for Core Switches) For core switches connecting to BRAS, firewalls, or other routers, create interconnection VLANs and bind them to VPN instances if required. Then assign IP addresses to the VLANIF interfaces for routing and OSPF configuration . 5. Verify Configuration Check the IP address assignment and interface status:

show ip interface briefping

This confirms connectivity and proper configuration . 6. Save Configuration Ensure the configuration persists after a reboot:

write memory

or

copy running-config startup-config

By following these steps, the core switch will have a static IP address for management and routing purposes, and it can participate in network protocols like OSPF or communicate with connected devices .

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