Loopback Interfaces - Dell S6100 Configuration Manual

Dell Networking OS 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 TenGigabitEthernet 1/1/2/1-1/1/4/4
tagged TenGigabitEthernet 5/1/1
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
• Delete a Loopback interface.
CONFIGURATION mode
no interface loopback number
Many of the commands supported on physical interfaces are also supported on a Loopback interface.
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