Cisco Systems 78-13983-04 Configuring Loopback Interfaces, Exit to global configuration mode

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Chapter 4 Configuring with the Command-Line Interface

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 issued.

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 changes 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

Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide

 

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Contents Customer Order Number DOC-7813983= Text Part Number Corporate HeadquartersCopyright 2002 Cisco Systems, Inc All rights reserved Audience Software FeaturesLimitations and Restrictions First-Time Configuration About This GuideConfiguring PPP Multiplexing Using the Setup Command FacilitySaving Configuration Changes Configuring PIMAssigning a QoS Boilerplate to an Interface Configuring RedundancyWhere to Go Next Mode y-cablePage Chapter Title Description ObjectivesAudience OrganizationBoldface screen Document ConventionsConvention Description Boldface fontWorld Wide Web Additional InformationRelated Documentation Obtaining DocumentationDocumentation Feedback Obtaining Technical AssistanceDocumentation CD-ROM Ordering DocumentationCisco.com To access Cisco.com, go to the following websiteTechnical Assistance Center Contacting TAC by Telephone Benefits Overview of the MWRMLP, PPP Control Path IPCP, NCP, LCP, Clns Software FeaturesCisco IOS Software Network Processor SoftwareRTP/UDP Header Compression PPP Multiplexing/DemultiplexingRTP Header Compression Redundancy SupportRFC1253-MIB MIB SupportMWR 1900 supports the following MIBs RFC1213-MIB802.1Q VLANs Frame Relay FR Limitations and RestrictionsBefore You Begin Understanding Boot ImagesUnderstanding Interface Numbering Interface type Slot number/Interface number Configuring Global Parameters Using the Setup Command FacilityBefore Starting Your Router Enter a host name for the router this example uses Viewing the configurationYou are then prompted to configure the specified interface Completing the ConfigurationSummary of interfaces is displayed First-Time Configuration Where to Go Next Where to Go NextGetting Help Cisco IOS Software BasicsAs interface serial 0/0 Understanding Command ModesConfigure terminal Exit , or logoutSaving Configuration Changes Undoing a Command or FeaturePage Configuring with the Command-Line Interface Verifying the Version of Cisco IOS Software Configuring the Host Name and PasswordEnter global configuration mode Prompt changes to Routerconfig#Change the name of the router to a meaningful name Configuring Loopback InterfacesExit to global configuration mode Exit interface configuration modeConfiguring the FE Interface IP Address Configuring Fast Ethernet InterfacesSetting the Speed and Duplex Mode Configuring PIM Configuring Routing Protocol AttributesSpecify the speed Configuring Hsrp Support Enabling the FE Interface Configuring Multilink InterfacesSpecify a priority Configuring IP Address Assignment Configuring Multilink PPPEnable multilink PPP operation To set the maximum length of the subframe, enter Configuring PPP MultiplexingConfiguring RTP/UDP Compression To set the default PPP protocol ID, enterRPM-3config-if#ip rtp header-compression Configuring T1 Interfaces Configuring T1 and E1 InterfacesSet the carrier delay for the serial interface Configuring E1 InterfacesConfiguring QoS Attributes Creating a Policy Map Creating a Class Map78-13983-04 Assigning a QoS Boilerplate to an Interface Configuring RedundancyRedundant MWR 1900s Stand-Alone MWR Exit y-mode configuration modeSpecify the interface to be used for backhauling MWR1900-1#show running-config Verifying the ConfigurationMatch access-group Ip ospf message-digest-key 1 md5 mymd5pw Ip ospf Hello-interval Ospf Dead-interval Monitoring and Managing the MWR Command Purpose Show Commands for Monitoring the MWRShow interface type slot / port Show controllersShow protocols Command Reference Clear ip rtp header-compression Clear ppp mux interface interface Command Modes Command History Usage Guidelines ExamplesRelated Commands Description Clear ppp muxIp rtp compression-connections Syntax Description Defaults Command ModesConnections Interface configuration Ip rtp header-compressionEnables RTP header compressionIp rtp header-compression Syntax Description Defaults Command Modes Command HistoryPassive Related Commands Description Standby use-interface Mode y-cableMode y-cable StandalonePpp mux Command Modes Command HistoryPpp mux delay integer no ppp mux delay Ppp mux delayUsage Guidelines Examples Related Commands Ppp mux frame integer no ppp mux frame Defaults Command Modes Command HistoryDefault maximum length is Interface configuration Ppp mux framePpp mux pid integer Ppp mux pidPpp mux subframe length integer No ppp mux subframe length Ppp mux subframe lengthPpp mux subframe count Default maximum is Interface configurationPpp mux subframe count integer No ppp mux subframe count Redundancy Global configurationFollowing example enables redundancy mode Invoked y-cable modeField Description Show ip rtp header-compressionShow ip rtp header-compression type number detail 1describes the significant fields shown in the displayThat can exist on an interface Interface interface Show ppp mux2describes the significant fields shown in the display Ppp mux Enables PPP multiplexing/demultiplexingShow redundancy This command has no attributesStandby Invokes y-cable modeInvokes redundancy mode Stand-alone configurationNo standalone Syntax Description DefaultsCable configuration StandaloneStandby use-interface interface health revertive backhaul Standby use-interfaceStandby use-interface loopback102 revertive Page IP address Cisco IOS About Command modes Enable modeCounters, PPP multiplexing IN-2 MIB support Mode y-cableConfiguring CommandIN-4