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Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide
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Chapter4 Configuring with the Command-Line I nterface
Configuring Loopback Interfaces
Step 3 Change the name of the router to a meaningful name.
Router(config)# hostname router_name
The prompt changes from “Router” to the user-configured hostname once this command is issu ed.
Step 4 Enter an enable secret password. This password provides access to privileged EXEC mode. When a user
types enable at the EXEC prompt (Router> ), they must enter the enable secret password to access
configuration mode.
router_name(config)# enable secret password
Step 5 Enter line configuration mode to configure the console port. The prompt change s to
Router(config-line)#.
router_name(config)# line con 0
Step 6 Enter a timeout value of 0 to prevent the router’s EXEC facility from timing out if you do not type any
information on the console screen for an extended period.
router_name(config-line)# exec-timeout 0 0
Step 7 Exit to global configuration mode.
router_name(config-line)# exit
Configuring Loopback Interfaces
The loopback interface is a software-only, virtual interface that emulates an interface that is always up.
The interface-number is the number of the loopback interface that you want to create or configure. There
is no limit on the number of loopback interfaces you can create.
The multilink interface is a virtual interface, if you are not going to assign an explicit IP address to the
interface, you should create a loopback interface for the multilink interface to enable IP processing on
the interface.
In the case where the MWR 1900 is used in a redundant configuration, you must also configure loopback
interfaces for the health and revertive interfaces. The health interface monitors the status of the
redundant configuration so that the standby router can take over if there is a problem with the active
router. The revertive interface is required to ensure that the switchover takes place. We recommend that
you use 101 for the health interface and 102 for the revertive interface.
To configure a loopback interface, do the following beginning in global configuration mode:
Step 1 Create a loopback interface for each multilink interface:
Router(config)# interface loopback number
Router(config-if)# ip address ip_address subnet_mask
Note For the health and revertive interfaces, you do not need to assign an IP address.
Step 2 Exit interface configuration mode:
Router(config-if)# exit