Cisco Systems VG224 manual Debugging Commands, Configuration Register Commands

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Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

•reset or i—Reset and initialize the router, similar to power-on.

•tftpdnld—Download an image using Trivial File Transfer Protocol (TFTP) from a remote server.

•show rom-monitor—Shows version of read-only ROMMON, and if present, the upgrade version of ROMMON. It also shows the current version of ROMMON, which version will be selected for execution when the Cisco IOS software is booted again. This command is available in the Cisco IOS EXEC mode.

–showmon—Available in the ROMMON command mode. Provides the same information as the show rom-monitorcommand in the Cisco IOS EXEC mode.

•upgrade rom-monitor[file<URL>preference[readonlyupgrade]]—Installs and reloads a new version of ROMMON in the Cisco IOS exec mode. URL refers to the path where the new ROMMON image is stored. Prompts the user to save the configuration.

–upgrade rom-monitor preference [readonlyupgrade]—Selects the version of ROMMON to be loaded the next time the router is reloaded. This command is used in the Cisco IOS EXEC mode.

–rommon-pref—Used in ROMMON command mode. Provides the same information as upgrade rom-monitor preference command in the Cisco IOS EXEC mode.

–fpga-pref[readonlysystem]—Field Programmable Gate-Array (FPGA), used in ROMMON command mode. Selects which FPGA to run.

Debugging Commands

Most debugging commands are functional only when Cisco IOS software has crashed or is aborted. If you enter a debugging command and Cisco IOS crash information is not available, the following error message appears:

“xxx: kernel context state is invalid, can not proceed.”

•stack or k—Produces a stack trace.

•context—Displays processor context.

•frame—Displays an individual stack frame.

•sysret—Displays return information from the last booted system image. This information includes the reason for terminating the image, a stack dump of up to eight frames, and, if an exception is involved, the address where the exception occurred. For example:

rommon 8 > sysret

System Return Info:

count: 19, reason: a SegV exception

pc:0x802b1040, error address: 0x802b1040 Stack Trace:

FP: 0x80908398, PC: 0x802b102c

FP: 0x809083b0, PC: 0x802b0b88

FP: 0x809083d8, PC: 0x8017039c

FP: 0x809083e8, PC: 0x8016f764

Configuration Register Commands

The virtual configuration register resides in NVRAM. You can display or modify the virtual configuration register from either the ROM monitor or the operating system software.

Cisco VG224 Voice Gateway Software Configuration Guide

 

OL-5005-01

C-5

 

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Contents Corporate Headquarters Cisco VG224 Voice Gateway Software Configuration GuideCisco VG224 Voice Gateway Software Configuration Guide N T E N T S Where to Go Next Command Descriptions C-3 Debugging Commands C-5 OL-5005-01 Audience ObjectivesChapter Title Description Document OrganizationRelated and Referenced Documents Cisco Product Document Title Ordering Documentation Obtaining DocumentationCisco.com Documentation CD-ROMCisco TAC Website Opening a TAC Case Documentation FeedbackObtaining Technical Assistance TAC Case Priority Definitions Obtaining Additional InformationXiii Xiv Identifying the Cisco VG224 Understanding Interface Numbering Cisco IOS Software BasicsCisco VG224 is used as an example. See -2 on Port Numbering ConventionsGetting Help Command ModesUnderstanding Cisco IOS Software Basics Undoing a Command or Feature Upgrading to a New Cisco IOS Release Where to Go NextSaving Configuration Changes Router# copy running-config startup-configCisco VG224 Voice Gateway Software Configuration Guide Before Starting Your Cisco VG224 Using the setup CommandConfiguring Global Parameters Using the setup CommandUsing the setup Command Configuring Global Parameters Enter a host name for the Cisco VG224 Configuring global parameters Enter host name Router VG224Configure the Isdn switch type for PRI Configuring Controller and Interface ParametersConfiguring Fast Ethernet and Serial Interface Parameters Optional Configure ChapFast Ethernet Interface Configuration Completing the ConfigurationAt this point you can proceed to the following OL-5005-01 Configuring with the Command-Line Interface Command Purpose Configuring the Host Name and PasswordTip If you are having trouble, ensure the following Verifying the Host Name and PasswordConfiguring Fast Ethernet Interfaces Saving Configuration Changes OL-5005-01 Prerequisites Configuring the Voice InterfaceRouter# show startup-config Router# show running-configCisco IOS Voice Configuration Library OL-5005-01 Cisco VG224 Configuration Example Appendix a Cisco VG224 Configuration Example Dial-peer voice 6 pots service stcapp Port 2/5 Determining the File System on a Compact Flash Memory Card Formatting ProceduresFormatting the Compact Flash Memory Cards Router# show flash all Geometry and format information is displayed in this formaRouter# show slot0 all Router# erase slot0 Geometry and format information is displayed in this format11# show flash all Copying Files File and Directory OperationsOperations for Use with Class B Flash File System Formatting Compact Flash Memory as a Class C File SystemDisplaying the Contents of a Compact Flash Memory Card Router# delete slot0cvg224-i-mz.tmp Delete Files from Compact Flash MemoryRouter# show slot0 Router# dir slot0Router# more slot0cvg224-i-mz Displaying File ContentOperations for Use with Class C Flash File System File Operations for Class C Flash File SystemRouter# show slot0 filesys Displaying Geometry and Format InformationRouter# rename flashcvg224-i-mz.tmp flashcvg224-i-mz Rename a FileRouter# delete flashcvg224-i-mz.tmp Create a New Directory Router# mkdir flash/configRouter# mkdir flash/config/test-config Directory Operations for Class C Flash File SystemEnter a Directory and Determine Which Directory You Are Router# cd flash/config Router# dir flashRouter# rmdir flash/config/test-config Remove a DirectoryRouter# cd slot0 Router# cd configPwd DirEntering the ROM Monitor Mode Using the ROM MonitorVerifying ROM Monitor CommandsConfiguring Command or Action PurposeROM Monitor Syntax Conventions Command DescriptionsCommand abc Rommon 8 dir flash /dir slot0 Showfpga-Show FPGA-related informationConfiguration Register Commands Debugging CommandsConfreg Using the show rom-monitor commandRouter# show rom-monitor Using the upgrade rom-monitor CommandThen reload the router Using the xmodem Command Recovering Boot and System ImagesRommon 1 tftpdnld Using the tftpdnld CommandOL-5005-01 Host name Command C-8 CommandsContext C-5 Debugging commands C-5dir C-4 TimeoutUser Exec command mode Meminfo Upgrade
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VG224 specifications

The Cisco Systems VG224 is a versatile VoIP (Voice over Internet Protocol) gateway designed to facilitate the integration of traditional phone systems with modern IP-based communications. This device plays a crucial role in providing connectivity between analog phones and digital networks, allowing organizations to transition smoothly from legacy telephony systems to IP telephony.

One of the standout features of the VG224 is its ability to support up to 24 analog phone lines. This scalability makes it an ideal choice for small to medium-sized businesses that require a dependable solution to handle their telephony needs without overspending on infrastructure. The VG224 acts as a bridge, converting analog voice signals into digital IP packets, thus enabling seamless communication over the Internet or intranets.

The VG224 is equipped with a range of technologies that enhance its functionality and reliability. Voice activity detection (VAD), comfort noise generation (CNG), and echo cancellation are just some examples of the advanced audio processing techniques integrated into the VG224. These technologies improve call quality by ensuring clear and uninterrupted conversations, even under varying network conditions.

In terms of characteristics, the VG224 features a user-friendly interface with a web-based management console, making it easy for network administrators to configure and manage the device remotely. This streamlined approach to management is crucial for businesses that require quick adjustments to their communication infrastructure without the need for extensive technical knowledge.

The VG224 supports multiple signaling protocols, including H.323, MGCP (Media Gateway Control Protocol), and SIP (Session Initiation Protocol). This flexibility allows it to integrate seamlessly with various IP telephony systems and offers businesses the option to utilize their preferred communication standards. Additionally, the device supports power over Ethernet (PoE), providing the convenience of powering devices through the same cable used for data connectivity, thus reducing the need for additional power sources.

In conclusion, the Cisco Systems VG224 is a robust VoIP gateway that combines advanced technology with user-friendly features. Its capacity to support up to 24 analog lines, along with its compatibility with various signaling protocols, makes it an excellent choice for businesses looking to modernize their telecommunication systems while maintaining the reliability of traditional analog connections. With its ease of management and high-quality voice processing capabilities, the VG224 stands out as a key asset for any organization aiming to optimize its communication infrastructure.
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