Configuring Loopback Interfaces; Configuring Fast Ethernet Interfaces - Cisco MWR 1941-DC - 1941 Mobile Wireless Router Software Configuration Manual

Configuring Loopback Interfaces

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 1941-DC 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:
Create a loopback interface for each multilink interface:
Step 1
Router(config)# interface loopback number
Router(config-if)# ip address ip_address subnet_mask
Note
Exit interface configuration mode:
Step 2
Router(config-if)# exit

Configuring Fast Ethernet Interfaces

To configure the FE interface of the MWR 1941-DC, complete the following tasks:
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Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide
4-4
For the health and revertive interfaces, you do not need to assign an IP address.
Configuring the FE Interface IP Address
Setting the Speed and Duplex Mode
Configuring Routing Protocol Attributes
Configuring PIM
Configuring HSRP Support
Enabling the FE Interface
Chapter 4 Configuring the MWR 1941-DC in an IP-RAN
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