What is SNMPv1? | Cisco Systems Dial NMS specs

Overview of Basic SNMP Building Blocks

What is SNMPv1?

SNMP must account for and adjust to incompatibilities between managed devices. Different computers use different data-representation techniques, which can compromise the ability of SNMP to exchange information between managed devices.

What is SNMPv1?

SNMPv1 is the initial implementation of the SNMP protocol and is described in RFC 1157 (http://www.ietf.org/rfc/rfc1157).

SNMPv1:

•Functions within the specifications of the Structure of Management Information (SMI).

•Operates over protocols such as User Datagram Protocol (UDP), Internet Protocol (IP), OSI Connectionless Network Service (CLNS), AppleTalk Datagram-Delivery Protocol (DDP), and Novell Internet Packet Exchange (IPX).

•Is the de facto network-management protocol in the Internet community.

The SMI defines the rules for describing management information by using Abstract Syntax Notation One (ASN.1). The SNMPv1 SMI is defined in RFC 1155 (http://www.ietf.org/rfc/rfc1155). The SMI makes three specifications:

•ASN.1 data types

•SMI-specific data types

•SNMP MIB tables

SNMPv1 and ASN1 Data Types

The SNMPv1 SMI specifies that all managed objects must have a subset of associated ASN.1 data types. Three ASN.1 data types are required:

•Name—Serves as the object identifier (object ID).

•Syntax—Defines the data type of the object (for example, integer or string). The SMI uses a subset of the ASN.1 syntax definitions.

•Encoding—Describes how information associated with a managed object is formatted as a series of data items for transmission over the network.

SNMPv1 and SMI-Specific Data Types

The SNMPv1 SMI specifies the use of many SMI-specific data types, which are divided into two categories:

•Simple data types—Including these three types:

`Integers—A signed integer in the range of -2,147,483,648 to 2,147,483,647.

`Octet strings—Ordered sequences of zero to 65,535 octets.

`Object IDs— Come from the set of all object identifiers allocated according to the rules specified in ASN.1.

Basic Dial NMS Implementation Guide

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Cisco Systems Dial NMS manual What is SNMPv1?, SNMPv1 and ASN1 Data Types

Contents

Basic Dial NMS Implementation Guide Basic Dial NMS Implementation Guide Audience What is SNMPv1? What is SNMPv2?Dial NMS Service Definition Scope Task 1-Enabling Snmp in a Cisco IOS Device Task 3-Using Mrtg to Monitor and Graph Traffic LoadsTask 5-Setting Up a Web Portal for the Dial NMS Enabling Snmp Task 8-Using CiscoWorks 2000 Resource Manager Essentials Task 6-Managing IP Addresses by Using DNSTask 7-Using HP OpenView to Create the Snmp Framework Using CiscoView Contents Basic Dial NMS Implementation Guide Purpose AudienceScope Conventions Convention DescriptionBold Related Documentation and Sites Technical References and Support Internetworking Solutions Guides Cisco Connection Online Documentation CD-ROM Documentation FeedbackAcknowledgements About Snmp UCD-SNMP Snmp Technology TAC Page -Network What are the Basic Components of SNMP?Site Description Managed devices NMS What are Snmp MIBs? Vines What is SNMPv1? SNMPv1 and ASN1 Data Types What is SNMPv2? SNMPv1 Protocol Operations About Snmp Management SNMPv2 and SMI About Snmp Security Page Network Design for a Dial NMS Case Study Introduction to the Case Study Benefits of a Dial NMS Dial NMS Planning Questionnaire THEnetNetwork Design Questions Answers Accounting tools and database MrtgCustom-based AAA Query tools Dial NMS Service Definition Show modem version Show versionShow running Show interface accounting ` show modem connect-speeds ` show access-lists` show modem operational-status Show snmp group Network Topology for One POP Cisco AS5800 access servers Network Topology Hardware Requirements Hardware Purpose101 50,000 5000 Lines / 1288 = 3.88 chassis AS5800s Uses CLI-based Snmp freeware to explore the Snmp MIBs Software RequirementsSoftware and Management Systems Purpose OIDs that are useful for operating a dial network Configuration Design Parameters Snmp Network Name Assigned IP Subnet DescriptionNOC Community Strings Purpose ABC Implementation and Operation TasksSupport Contact Phone T1 Dial-in Number Circuit ID Contract DEFPage Dial Related System Management MIB II / Interfaces CISCO-POP-MGMT-MIB OLD-CISCO-CHASSISRFC1213-MIB Show controllers t1 CommandEquivalent Cisco IOS Call-counters Connect-speeds Variable DescriptionShow modem Show caller Show caller ip Show caller user About Enabling Snmp ` UCD-SNMP Command Purpose Enabling Snmp Changes, environmental variables, and critical device This command enables 14+ other commands for distinctTypes of Snmp traps. Edit this command list to include only ConditionsPage About Using UCD-SNMP UCD-SNMP Installing UCD-SNMP and Downloading Cisco MIBs Exploring Snmp MIBs for Dial Netwo rks Step Serial1/0/00 propPointToPointSerial About Snmp Commander Setting Up Snmp Commander Snmp Commander Tool Basic Dial NMS Implementation Guide Page Task 3-Using Mrtg to Monitor and Graph Traffic Loads About Mrtg About Selecting Dial OIDs Base MIB and OID DescriptionCISCO-POP-MGMT-MIB CISCO-MODEM-MGMT-MIB NAS How to Inspect and Interpret Data Daily Graph DS0s and PPP Sessions in Use Configuration file used to create these graphs is posted at Monthly Graph DS0s and PPP Sessions in Use Creating and Editing a Configuration File Interface Type Syntax Example Example # purpose DS0s and Analog # purpose cpmISDNNoResource and cpmModemNoResource Crontab from any directory # purpose activeDS0s and cvpdnSessionTotal Sending 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 NTP About Modem Call Records Web-Based MCR Viewer Enabling NTP on a Cisco IOS Device Setting Up an NTP Client Travis-nas-01show ntp association Server Troubleshooting the NTP Client Problem SolutionNtpq -p command Console errors or logging console warnings Enables logging up to the debug level all eight levelsSpecifies the IP address of the syslog server Configuring the Syslog Daemon This example, only the fourth T1 of a T3 card is shown Daemon is not running, no ID is returned Inspecting Syslog Messages in t he Log File Aurora/etc -tail -f /var/log/router.log Generic URL Syntax Description Example Views logs on a File//var/log/router.log Local hostPage About a Web Portal Utility Function Utility Function Building a Device Linker Web Function Formula Example Device Linker Management Troubleshooting a Cisco 2511 Console Connection C2511-oob#clear line tty Enables the router to function as an Http server About Http Access to the CLIUsing Http to Access CLI Commands Uses the AAA facility as an authentication method Formula Example Post the Html page that you created in to a web server Cisco IOS CLI Commander Click on a CLI command and view the command output in a web Output for the Show Caller Command Task 6-Managing IP Addresses by Using DNS About Managing IP Addresses Using Cisco Network Registrar CLI Command s Nrcmd zone 101.21.172.in-addr.arpa. listRR Opt/nwreg2/usrbin/nrcmd zone 101.21.172.in-addr.arpa. listRR Nrcmd zone the.net. addRR bobslake-nas-02 a Using a Batch File to Make Changes to a DNS Configuration Run the script by using the -b optionFollowing output appears Creating a Primary Forward Zone Creating an IP Tracker Web IP Tracker Web Host = doc-oob-03.the.net How to Create a Reverse DNS Zone Page Task 7-Using HP OpenView to Create Snmp Framework About HP OpenView Verifying the Snmp Configuration Last message Initialization complete Exit status Object manager name snmpCollect State Snmp Configuration Loopback IP Address and Community Strings Click Add and Apply to submit the entries About Snmp Demand Polls Performing an Snmp Demand Poll Select Network Connectivity Poll Node Field Description You can identify the software version running on the device Testing Snmp Get RequestsConfirms the interfaces were successfully pinged Field Returned Value Description Troubleshooting Snmp and a Demand Poll Verifying that Snmp Traps Are Received Traps in the All Events Browser Unmanaging the Dial Ports Available Interfaces and Ports for a Cisco AS5800 Creating and Adjustin g Maps Select Automatic Layout About Discovery FiltersGo to View Choose Off For This Submap Setting Up and Editing a Discover y Filter TheNetNodes TheNet Node List AS5800-1, AS5800-2 Constituent parts Using the Hpov CLI to Enter a Device into the Database Restart the netmon daemon by entering the following commandsPage CiscoWorks 2000 TAC Support Page -Provides links to About CiscoWorks 2000 RMEReference CiscoWorks 2000 Documentation Set -A collection Importing Devices from Hpov and Popul ating the Databases Select Inventory Import from Local NMS Click Next Devices are imported and a status summary appears To accept the default settings, click Finish Verifying that Device Polling is Turned On Polling the Devices Status of the Devices Select All in the Views window Select one or more devicesInspect the available elements for the devices Backing up Cisco IOS Configurations Select All DevicesSelect one or more devices from the list that appears Using CiscoView Go to Monitor CiscoViewSelect and view different system components Available Modems in the Cisco AS5800 Dial Shelf Page AAA HttpNTP Snmp DNS FcapsUCD-SNMP FTP Ovstop command Ovw& commandNTP Incident tracking FAQManaged devices Management Message types and commands MIBs NMS Touch command Troubleshooting HP OpenView NOC POP Index Basic Dial NMS Implementation Guide