Configuring Layer 3 Interfaces Layer 3 Interface Configurations
User Guide
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Switch#copy running-config startup-config
2.2.2 Configuring IPv4 Parameters of the Interface
Follow these steps to configure the IPv4 parameters of the interface.
Step 1 configure
Enter global configuration mode.
Step 2 interface {
interface-type
} {
interface-id
}
Enter Layer 3 interface configuration mode.
interface-type
: Type of the Layer 3 interface, including fastEthernet, gigabitEthernet,
ten-gigabitEthernet, loopback and VLAN.
interface-id:
The interface ID.
Step 3 Automatically assign an IP Address for the interface via DHCP or BOOTP:
ip address-alloc { dhcp | bootp }
Specify the IP Address assignment mode of the interface.
dhcp: Specify the Layer 3 interface to obtain an IPv4 address from the DHCP Server.
bootp: Specify the Layer 3 interface to obtain an IPv4 address from the BOOTP Server.
Manually assign an IP Address for the interface:
ip address {
ip-addr
} {
mask
} [ secondary ]
Configure the IP address and subnet mask for the specified interface manually.
ip-addr
: Specify thse IP address of the Layer 3 interface.
mask
: Specify the subnet mask of the Layer 3 interface.
secondary: Specify the interface’s secondary IP address which allows you to have two
logical subnets. If this parameter is omitted here, the configured IP address is the interface’s
primary address.
Step 4 show ip interface brief
Verify the summary information of the Layer 3 interfaces.
Step 5 end
Return to privileged EXEC mode.
Step 6 copy running-config startup-config
Save the settings in the configuration file.
The following example shows how to configure the IPv4 parameters of a routed port,
including setting a static IP address for the port and enabling the Layer 3 capabilities:
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/1
Switch(config-if)#no switchport
Switch(config-if)#ip address 192.168.0.100 255.255.255.0
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