Cisco Systems CISCO1751 quick start Saving the Configuration, Router# show startup-config

Page 13
Saving the Configuration

Configuring Voice-over-IP

For complete information about the global configuration commands and about configuring LAN and WAN interfaces on your router, refer to the Cisco IOS configuration guides and command references.

The rest of this guide explains how to configure your router for VoIP traffic.

Note Voice configuration uses a number of Cisco IOS commands. For complete information about these commands, refer to the Cisco 1751 Router Software Configuration Guide. You can also enter a question mark after a command or partial command at the Router(config)# prompt to get syntax and argument help.

Note At any point, you can see the operating configuration, including changes you just made, by entering the show running-configcommand. To enter this command, you have to exit from configuration mode by pressing Ctrl-Zor entering the end global configuration command.

Saving the Configuration

You must save the new configuration to nonvolatile RAM (NVRAM) periodically during the configuration process and also when you finish configuring the router.

Cisco IOS software uses two configuration files—startup config and running config. The startup-config file is a backup file that has all the information you specified about the router interfaces and is used by the router on the next restart. The running-config file has the current operating configuration with the changes you have just made. You can make any changes to the running-config file; however, these changes will be lost when the router powers down. To make these changes permanent, copy the running-config file to the startup-config file stored in NVRAM.

Follow these steps for each router to write the new configuration to NVRAM:

Step 1 Exit configuration mode, and return to the enable prompt by pressing Ctrl-Zor entering the end global configuration command.

Step 2 To see the startup configuration stored in NVRAM, enter the following command at the enable prompt:

Router# show startup-config

Step 3 To see the operating configuration, including any changes you have just made, enter the following command:

Router# show running-config

Step 4 To write your changes to NVRAM and make them permanent, enter the following command:

Router# copy running-config startup-config

Building configuration. . .

[OK]

Router#

The router is now configured to boot in the new configuration.

Cisco 1751 Voice-over-IP Quick Start Guide

 

78-11259-05

13

 

 

 

Image 13
Contents Configuring Voice-over-IP, page List of Terms, page Installing WAN and Voice Interface Cards, pageAudience Audience, page Conventions, pageIf You Are Installing Voice Interface Cards Installing WAN and Voice Interface CardsConventions WIC and VIC Installation Procedure Figure 2 Inserting a WIC or VIC in the Router Connecting the FXS, FXO, and E&M VICs to the NetworkSignal Connector Pinouts for FXS, FXO, and E&M VICs2-Port ISDN BRI Card Checking FXS VIC InstallationDescription RJ-48S Wiring for E&M ConnectorsConnecting the 2-Port ISDN BRI Card ISDN BRI Card LEDs Determining Voice Port NumberingNT Interface use TE Interface useExample Cisco Router and Security Device ManagerConfiguration Tools Configuring Voice-over-IPCisco ConfigMaker Application Cisco IOS Command-Line Interface Major Voice over IP Configuration TasksInformation for International Users Entering Configuration ModeRouter# show startup-config Saving the ConfigurationWildcards and Number Expansion Dial PlanWestconfig-dial-peer# port 0/0 Num-Exp Command Entry Configuring FXS InterfacesDestination ExtensionTelephone Number Local Dial PeersVoice Port Dial-Peer TagThese commands are summarized in Figure Figure 14 East Router Configured for Local Dial Peers Destination PatternFigure 13 Basic Voice Network East Router 919 FXS VIC 1/0Calling Between Routers Checking Dial Peer ConfigurationRemote Location Destination Pattern1919555 Checking FXS Configuration Configuring FXO InterfacesOther Routers on the Network Remote LocationWest Figure 18 FXO Gateway to PSTNChecking FXO Configuration Configuring E&M InterfacesCommand signal wink-start immediate delay-dialFigure 20 Linking PBXs over the IP Network Remote Dial Peers Checking E&M Interface Configuration Tuning Parameters for Real-Time Voice TrafficIP Precedence Need for Quality of ServiceRSVP Configuring RSVPMultilink PPP Interleaving Configuring RTP Header Compression Configuring Multilink PPP InterleavingRouterconfig-if# ip rtp reserve lowest-UDP-port range-of-ports RTP Header CompressionConfiguring Frame Relay for VoIP List of Terms Cisco.com Obtaining DocumentationOrdering Documentation Documentation Feedback Submitting a Service RequestObtaining Technical Assistance Cisco Technical Support WebsiteObtaining Additional Publications and Information Definitions of Service Request SeverityiQ Magazine is the quarterly publication from Cisco Systems designed to help growing companies learn how they can use technology to increase revenue, streamline their business, and expand services. The publication identifies the challenges facing these companies and the technologies to help solve them, using real-world case studies and business strategies to help readers make sound technology investment decisions. You can access iQ Magazine at this URL