Configuring Physical Layer 3 Interfaces - Cisco Catalyst 4500 series Administration Manual

Configuring Physical Layer 3 Interfaces

Configuring Physical Layer 3 Interfaces
Before you can configure physical Layer 3 interfaces, you must enable IP routing if IP routing is
Note
disabled, and specify an IP routing protocol.
To configure physical Layer 3 interfaces, perform this task:
Command
Step 1
Switch(config)#ip routing
Step 2
Switch(config)# interface {fastethernet |
gigabitethernet | tengigabitethernet} slot/port}
| {port-channel port_channel_number}
Step 3
Switch(config-if)#no switchport
Step 4
Switch(config-if)# ip address ip_address
subnet_mask
Step 5
Switch(config-if)# no shutdown
Step 6
Switch(config-if)# end
Step 7
Switch# copy running-config startup-config
Step 8
Switch# show interfaces [type slot/interface]
Switch# show ip interfaces [type slot/interface]
Switch# show running-config interfaces [type
slot/interface]
This example shows how to configure an IP address on Fast Ethernet interface 2/1:
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# ip routing
Switch(config)# interface fastethernet 2/1
Switch(config-if)# no switchport
Switch(config-if)# ip address 10.1.1.1 255.255.255.248
Switch(config-if)# no shutdown
Switch(config-if)# end
Switch#
This example shows how to use the show running-config command to display the interface IP address
configuration of Fast Ethernet interface 2/1:
Switch# show running-config
Building configuration...
!
interface FastEthernet2/1
no switchport
ip address 10.1.1.1 255.255.255.248
!
...
ip classless
no ip http server
!
!
line con 0
line aux 0
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
34-12
Chapter 34
Purpose
Enables IP routing (required only if disabled)
Selects an interface to configure.
Converts this port from physical Layer 2 port to physical
Layer 3 port.
Configures the IP address and IP subnet.
Enables the interface.
Exits configuration mode.
Saves your configuration changes to NVRAM.
Verifies the configuration.
End with CNTL/Z.
Configuring Layer 3 Interfaces
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