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Cisco Systems Dial NMS manual Task 3-Using Mrtg to Monitor and Graph Traffic Loads, About Mrtg

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Task 3—Using MRTG to Monitor and Graph

Traffic Loads

About MRTG

Multi Router Traffic Grapher (MRTG) is a free performance management application for Unix that monitors SNMP statistics from any SNMP capable device on your network and performs the following functions:

•Captures, stores, and graphically presents SNMP data. By default, a web page with four graphs per MIB object (OID) is created by MRTG. The graphs show the variation of MIB data over time.

•Runs from the crontab. Every five minutes, a cron job runs MRTG to query a user-configured list of OIDs and network devices. After each data collection cycle, the MRTG perl script posts updated graphs to a web page.

•Efficiently compresses and archives data samples to create graphs.

•Enables you to determine if trending data is useful for monitoring your environment before you invest in costly network performance software. If trending data is critical to manage your network, it may be necessary to purchase a commercial network performance package, such as Concord Network Health. However, you may find that MRTG is all you need.

Figure 10 MRTG Polls for OIDs; OID Values that Are Returned to MRTG

Cisco

IOS

devices Polling OID

Returning OID valves

MRTG

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Basic Dial NMS Implementation Guide

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Cisco Systems Dial NMS manual Task 3-Using Mrtg to Monitor and Graph Traffic Loads, About Mrtg

Contents

Basic Dial NMS Implementation Guide Basic Dial NMS Implementation Guide Dial NMS Service Definition What is SNMPv1? What is SNMPv2?Audience ScopeTask 5-Setting Up a Web Portal for the Dial NMS Task 3-Using Mrtg to Monitor and Graph Traffic LoadsTask 1-Enabling Snmp in a Cisco IOS Device Enabling SnmpTask 7-Using HP OpenView to Create the Snmp Framework Task 6-Managing IP Addresses by Using DNSTask 8-Using CiscoWorks 2000 Resource Manager Essentials Using CiscoViewContents Basic Dial NMS Implementation Guide Scope PurposeAudience Bold ConventionsConvention Description Technical References and Support Related Documentation and SitesInternetworking Solutions Guides Cisco Connection Online Acknowledgements Documentation CD-ROMDocumentation Feedback UCD-SNMP About SnmpSite Description What are the Basic Components of SNMP?Snmp Technology TAC Page -Network Managed devicesNMS What are Snmp MIBs? Vines SNMPv1 and ASN1 Data Types What is SNMPv1?SNMPv1 Protocol Operations What is SNMPv2?SNMPv2 and SMI About Snmp ManagementAbout Snmp Security Page Introduction to the Case Study Network Design for a Dial NMS Case StudyBenefits of a Dial NMS Network Design Questions Answers Dial NMS Planning QuestionnaireTHEnet Custom-based AAA MrtgAccounting tools and database Query toolsDial NMS Service Definition Show running Show versionShow modem version Show interface accounting` show modem operational-status ` show access-lists` show modem connect-speeds Show snmp groupNetwork Topology Network Topology for One POP Cisco AS5800 access servers101 50,000 5000 Lines / 1288 = 3.88 chassis AS5800s Hardware RequirementsHardware Purpose Software and Management Systems Purpose Software RequirementsUses CLI-based Snmp freeware to explore the Snmp MIBs OIDs that are useful for operating a dial networkConfiguration Design Parameters NOC Network Name Assigned IP Subnet DescriptionSnmp Community Strings PurposeSupport Contact Phone T1 Dial-in Number Circuit ID Contract Implementation and Operation TasksABC DEFPage RFC1213-MIB Dial Related System Management MIB II / InterfacesCISCO-POP-MGMT-MIB OLD-CISCO-CHASSIS Equivalent Cisco IOS CommandShow controllers t1 Call-countersShow modem Variable DescriptionConnect-speeds Show callerShow caller user Show caller ip` UCD-SNMP About Enabling SnmpEnabling Snmp Command PurposeTypes of Snmp traps. Edit this command list to include only This command enables 14+ other commands for distinctChanges, environmental variables, and critical device ConditionsPage UCD-SNMP About Using UCD-SNMPExploring Snmp MIBs for Dial Netwo rks Installing UCD-SNMP and Downloading Cisco MIBsStep Serial1/0/00 propPointToPointSerial Setting Up Snmp Commander About Snmp CommanderSnmp Commander Tool Basic Dial NMS Implementation Guide Page About Mrtg Task 3-Using Mrtg to Monitor and Graph Traffic LoadsCISCO-POP-MGMT-MIB About Selecting Dial OIDsBase MIB and OID Description NAS CISCO-MODEM-MGMT-MIBHow to Inspect and Interpret Data Daily Graph DS0s and PPP Sessions in Use Monthly Graph DS0s and PPP Sessions in Use Configuration file used to create these graphs is posted atInterface Type Syntax Example Creating and Editing a Configuration FileExample # purpose DS0s and Analog # purpose cpmISDNNoResource and cpmModemNoResource # purpose activeDS0s and cvpdnSessionTotal Crontab from any directorySending Mrtg Graphs to a Web Server Mrtg Graphs Viewed by Using a Web Browser Page About Syslog Message Type Description Syslog Message Severity Level About Modem Call Records About NTPWeb-Based MCR Viewer Enabling NTP on a Cisco IOS Device Travis-nas-01show ntp association Setting Up an NTP ClientServer Ntpq -p command Troubleshooting the NTP ClientProblem Solution Specifies the IP address of the syslog server Console errors or logging console warningsEnables logging up to the debug level all eight levels This example, only the fourth T1 of a T3 card is shown Configuring the Syslog DaemonDaemon is not running, no ID is returned Aurora/etc -tail -f /var/log/router.log Inspecting Syslog Messages in t he Log FileViews logs on a File//var/log/router.log Local host Generic URL Syntax Description ExamplePage Utility Function About a Web PortalUtility Function Building a Device Linker Web Device Linker Management Function Formula ExampleC2511-oob#clear line tty Troubleshooting a Cisco 2511 Console ConnectionUsing Http to Access CLI Commands About Http Access to the CLIEnables the router to function as an Http server Uses the AAA facility as an authentication methodFormula Example Post the Html page that you created in to a web server Cisco IOS CLI Commander Output for the Show Caller Command Click on a CLI command and view the command output in a webAbout Managing IP Addresses Task 6-Managing IP Addresses by Using DNSNrcmd zone 101.21.172.in-addr.arpa. listRR Using Cisco Network Registrar CLI Command sOpt/nwreg2/usrbin/nrcmd zone 101.21.172.in-addr.arpa. listRR Nrcmd zone the.net. addRR bobslake-nas-02 a Following output appears Using a Batch File to Make Changes to a DNS ConfigurationRun the script by using the -b option Creating an IP Tracker Web Creating a Primary Forward ZoneIP Tracker Web Host = doc-oob-03.the.net How to Create a Reverse DNS Zone Page About HP OpenView Task 7-Using HP OpenView to Create Snmp FrameworkLast message Initialization complete Exit status Verifying the Snmp ConfigurationObject manager name snmpCollect State Click Add and Apply to submit the entries Snmp Configuration Loopback IP Address and Community StringsPerforming an Snmp Demand Poll About Snmp Demand PollsField Description Select Network Connectivity Poll NodeConfirms the interfaces were successfully pinged Testing Snmp Get RequestsYou can identify the software version running on the device Field Returned Value DescriptionVerifying that Snmp Traps Are Received Troubleshooting Snmp and a Demand PollTraps in the All Events Browser Available Interfaces and Ports for a Cisco AS5800 Unmanaging the Dial PortsCreating and Adjustin g Maps Go to View About Discovery FiltersSelect Automatic Layout Choose Off For This SubmapTheNetNodes TheNet Node List AS5800-1, AS5800-2 Setting Up and Editing a Discover y FilterConstituent parts Restart the netmon daemon by entering the following commands Using the Hpov CLI to Enter a Device into the DatabasePage Reference About CiscoWorks 2000 RMECiscoWorks 2000 TAC Support Page -Provides links to CiscoWorks 2000 Documentation Set -A collectionSelect Inventory Import from Local NMS Importing Devices from Hpov and Popul ating the DatabasesDevices are imported and a status summary appears Click NextVerifying that Device Polling is Turned On To accept the default settings, click FinishStatus of the Devices Polling the DevicesInspect the available elements for the devices Select All in the Views windowSelect one or more devices Select one or more devices from the list that appears Backing up Cisco IOS ConfigurationsSelect All Devices Select and view different system components Using CiscoViewGo to Monitor CiscoView Available Modems in the Cisco AS5800 Dial Shelf Page NTP Snmp AAAHttp UCD-SNMP FTP DNSFcaps NTP Ovstop commandOvw& command Managed devices Management Message types and commands MIBs FAQIncident tracking NMSNOC POP Touch command Troubleshooting HP OpenViewIndex Basic Dial NMS Implementation Guide