Chapter 5: Layer 3 Interface Configuration 73
Section 5-2
Note The default port operation for the 4500 and 6500 series switches running IOS is
routed mode; the Catalyst 2900, 3500, and 3700 defaults to switchport mode. Also, on the
Catalyst 4500 and 6500, the interfaces are shutdown by default.
3. Assign an IP address:
(interface) ip address address netmask
When an interface begins acting as a Layer 3 interface, you must configure it with
information about the network connected to the broadcast domain. For IP networks,
this means the interface must be given an IP address. This address becomes the gate-
way address used by clients in the broadcast domain to which the interface is con-
nected.
Note The information presented here for configuring protocol information on a Layer 3
interface is the minimal requirements. You can find more detailed information concerning
protocol configuration in Cisco Field Manual: Router Configuration, published by Cisco
Press.
4. Enable the interface:
(interface) no shutdown
The default status of many Layer 3 interfaces is shutdown, which is a disabled state.
To ensure that the interface is operational, enable the interface with the command no
shutdown.
Verifying the Configuration
After you configure a protocol on an interface, use the following command to verify the
configuration:
(privileged) show ip interface type mod/port
Feature Example
The following example shows the configuration of interface Gigabit Ethernet 1/1 on
Distribution_Switch_A for Layer 3 processing. This interface acts as the gateway for all
the clients connected to Access_Switch_A. Figure 5-1 shows the network topology for
this example.
An example of the configuration for Distribution_Switch_A follows:
Distribution_Switch_A(config)# interface gigabitethernet 1/1
Distribution_Switch_A (config-if)# no switchport
Distribution_Switch_A (config-if)# ip address 192.168.10.1 255.255.255.0
Distribution_Switch_A (config-if)# no shut
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