Reference Guide

NOTE: To monitor VLAN interfaces, use Management Information Base for Network Management of TCP/IP-based
internets: MIB-II (RFC 1213).
NOTE: You cannot simultaneously use egress rate shaping and ingress rate policing on the same VLAN.
FTOS supports Inter-VLAN routing (Layer 3 routing in VLANs). You can add IP addresses to VLANs and use them in
routing protocols in the same manner that physical interfaces are used. For more information about configuring different
routing protocols, refer to the chapters on the specific protocol.
A consideration for including VLANs in routing protocols is that you must configure the no shutdown command. (For
routing traffic to flow, you must enable the VLAN.)
NOTE: You cannot assign an IP address to the default VLAN, which is VLAN 1 (by default). To assign another VLAN
ID to the default VLAN, use the default vlan-id vlan-id command.
To assign an IP address to an interface, use the following command.
• Configure an IP address and mask on the interface.
INTERFACE mode
ip address ip-address mask [secondary]
– ip-address mask: enter an address in dotted-decimal format (A.B.C.D). 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.
Example of a Configuration for a VLAN Participating in an OSPF Process
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
!
Loopback Interfaces
A Loopback interface is a virtual interface in which the software emulates an interface. Packets routed to it are
processed locally.
Because 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, view, or delete a Loopback interface, use the following commands.
• Enter a number as the Loopback interface.
CONFIGURATION mode
interface loopback number
The range is from 0 to 16383.
• View Loopback interface configurations.
EXEC mode
show interface loopback number
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