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Configure IP address for core switch

To configure an IP address on a core switch, assign it to a management VLAN or Layer 3 interface using the CLI, then activate the interface and save the configuration.Step 1: Access the Switch CLI

Connect to the switch using a console cable or via SSH if remote access is already enabled. Launch a terminal emulator (e.g., PuTTY) and log in with your credentials. Enter privileged EXEC mode by typing enable and providing the enable password .

Step 2: Enter Global Configuration Mode

From privileged mode, enter global configuration mode using:

configure terminal

This allows you to make changes to interfaces and VLANs .

Step 3: Configure the Management VLAN or Interface

For a Layer 2 switch, assign the IP address to the management VLAN (commonly VLAN 1):

interface vlan 1ip address 192.168.1.10 255.255.255.0no shutdown

For a Layer 3 (multilayer) switch, you can assign an IP directly to a routed interface:

interface gigabitEthernet0/1no switchportip address 192.168.1.10 255.255.255.0no shutdown

Replace 192.168.1.10 and the subnet mask with your network-specific values .

Step 4: Set the Default Gateway

To allow the switch to communicate with devices outside its subnet, configure the default gateway:

ip default-gateway 192.168.1.1

This is typically the IP address of the router connected to the core switch .

Step 5: Verify the Configuration

Check the IP assignment and interface status:

show ip interface briefping 192.168.1.1

Ensure the interface is up/up and can reach the gateway .

Step 6: Save the Configuration

To make the changes persistent across reboots, save the configuration:

write memory

or

copy running-config startup-config

This ensures the IP address remains configured after a restart .

Additional Considerations
  • If the switch is part of a stack, it is recommended to use a static IP to prevent connectivity issues during a stack switchover .
  • Ensure the IP address does not conflict with other devices on the network.
  • For security, consider limiting management access to specific MAC addresses or using ACLs on the management VLAN . By following these steps, your core switch will have a properly configured IP address for management and Layer 3 routing purposes.
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