Reference Guide

380 | Interfaces
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Assign an IP address to an interface with the following command the INTERFACE mode:
Figure 19-10 shows a sample configuration of a VLAN participating in an OSPF process.
Figure 19-10. Sample Layer 3 Configuration of a VLAN
Loopback Interfaces
A Loopback interface is a virtual interface in which the software emulates an interface. Packets routed to it
are processed locally. Since this interface is not a physical interface, you can configure routing protocols
on this interface to provide protocol stability. You can place Loopback interfaces in default Layer 3 mode.
To configure a Loopback interface, use the following command in the CONFIGURATION mode:
To view Loopback interface configurations, use the
show interface loopback number command in the
EXEC mode.
To delete a Loopback interface, use the
no interface loopback number command syntax in the
CONFIGURATION mode.
Many of the same commands found in the physical interface are found in Loopback interfaces.
See also Configuring ACLs to Loopback.
Command Syntax Command Mode Purpose
ip address ip-address mask
[
secondary]
INTERFACE Configure an IP address and mask on the interface.
• ip-address mask: enter an address in
dotted-decimal format (A.B.C.D) and the mask
must be in slash format (/24).
•
secondary: the IP address is the interface’s
backup IP address. You can configure up to eight
secondary IP addresses.
Command Syntax Command Mode Purpose
interface loopback number CONFIGURATION Enter a number as the loopback interface.
Range: 0 to 16383.
interface Vlan 10
ip address 1.1.1.2/24
tagged GigabitEthernet 2/2-13
tagged TenGigabitEthernet 5/0
ip ospf authentication-key force10
ip ospf cost 1
ip ospf dead-interval 60
ip ospf hello-interval 15
no shutdown
!