Digi TS8 manual About Snmp and the PortServer TS 8/16 Agent

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About SNMP and the PortServer TS 8/16 Agent

This section introduces SNMP and network management in TCP/IP networks, and it describes the PortServer TS 8/16 agent. It discusses the following:

Network management components

The SNMP agent

SNMP traps

The PortServer TS 8/16 agent’s MIB support

The PortServer TS 8/16 agent’s supported traps

Network Management Components

The TCP/IP network management architecture contains the following components:

Managed nodes such as host systems, routers, terminal and communications servers (such as PortServer TS 8/16) and other network devices

One or more network managers (also called network management stations), which are the points from which the network is managed

Agents that reside on managed nodes and retrieve management information and communicate this information to network managers

The network management protocol, SNMP, which governs the exchange of information between the nodes and stations

Management information, which is the database of information about managed objects. This database is called the management information base (MIB).

SNMP Management Agent

Each managed node contains at least one agent—a component that responds to requests from the network manager—that retrieves network management information from its node and notifies the manager when significant events occur.

SNMP Traps

A mechanism defined by SNMP is called a trap, which is a report or “alarm” from a managed node to an SNMP manager that a significant event has occurred.

MIB Support

The agent supports the following MIBs:

Read-write for MIB II (RFC 1213), which is an Internet-standard MIB, consisting of managed objects from the systems, interfaces, IP, ICMP, TCP, UDP, transmission, and SNMP group

Read-write for the character-stream devices using SMIv2 MIB (RFC 1658)

Read-write for the RS-232-like hardware devices MIB (RFC 1659)

Read-write for the PortServer TS 8/16 IP Network Control Protocol of the Point-to-Point Proto- col MIB (RFC 1473)

Message Support

The SNMP agent supports the Set, Get, GetNext, and Trap messages as defined in RFC 1157. These messages are used as follows:

Set, which means set the value of a specific object from one of the supported MIBs

Get, which means retrieve the value of a specific object form one of the supported MIBs

GetNext, which means retrieve the value of the next object in the MIB

Trap, which means send traps to the manager when a particular type of significant event occurs

Supported Traps

The agent can send traps when any of the following occur:

Cold starts (PortServer TS 8/16 initializes)

Authentication failures

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About SNMP and the PortServer TS 8/16 Agent

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Contents PortServer TS 8/16 Configuration and Administration Guide Page Contents Chapter Configuring Users Page Introduction This ChapterSetup Overview About Entering Commands on the Command Line About This GuideSupported Devices Access Resource CD Card Other Documents in the LibraryAbout Configuration Methods Configuring the PortServer TS 8/16 from a Telnet SessionConfiguring the PortServer TS 8/16 from the Web Interface Downloading a Configuration FileConfiguration Prerequisites Logging On As Root from the Command LineAccessing the Command Line from a Telnet Session Accessing the Configuration from the Web InterfaceConfiguring the IP Address Options for Configuring the IP Address and Mask OptionsConfiguring the Ethernet Interface with DPA-Remote ProcedureStarting Point Configuring the IP Address Using Ping-ARP Configuring the Ethernet Interface from the Command Line Configuring an IP Address using Dhcp and RarpManual Configuration Procedure Manual Configuration ExampleConfiguring an IP Address using Dhcp and Rarp Configuring Ports for RealPort What is RealPort? Configuring the RealPort SoftwareConfiguration Options About RealPortConfiguring Ports Web Interface Configuring Ports for RealPort Command Line ExampleConfiguring Ports for Printers Configuration Considerations Configuring Ports for Printers Web Interface Configuring Printer Connections Command LineTips for telnet and rsh Printing Related InformationConfiguring Printer Connections Command Line Configuring a Port for Direct-Access Printing Configuring a Port for Direct-Access Printing Configuring Ports for Terminals Configuring Ports for Terminals Web Interface Configuring Ports for Terminals Command LinePort Defaults Configuring Typical PC Connections About Computer ConnectionsAbout Computer Connections Configuring Ports for Modems Tips on Configuring a Modem Configuring Ports for Modems Web Interface Before You Begin Configuring PPP Configuring PPP Connections Web Interface Configuring Inbound PPP Connections Command Line Configuring Inbound PPP Connections Example Configuring Outbound PPP Connections Command Line Set user name=name n1=telephone-number Configuring IP Routing What is Routing Introduction to RoutingTypes of Routing About RIP Routing Updates PortServer TS 8/16 Participation in RIP Updates Configuring Static Routes Example Route Using the Ethernet InterfaceExample Route Using a PPP Link Configuring Dynamic Routes Using RIP Example Dynamic RoutesConfiguring Proxy ARP Configuring Proxy ARP Configuring Autoconnection Configuring a Port for Autoconnection Web Interface Configuring Autoconnection By Port Command LineAbout Autoconnection Configuring a User for Autoconnection Web Interface Configuring a User for Autoconnection Command LineConfiguring a User for Autoconnection Command Line Configuring Console Management Configuring Console Management Web Interface Configuring Console Management Command LineAbout Console Management Example SSH2 and Menu Access Example Alternate IP Addresses10-4 Configuring Security Features Controlling Access to the PortServer TS 8/16 Configuration Controlling Access to Inbound PortsControlling Access to Outbound Ports Controlling Access to the PortServer TS 8/16 Command LineUsing Radius to Authenticate Users What is RADIUS?Radius Components Radius Table KeyConfiguring Radius Web Interface Radius Accounting Attributes RFCHow Radius Works Configuring Radius Command Line Radius Command Line Configuration ExampleIssuing User Passwords Configuring SSH Version 2 for Secure Communication Password ProtectionUsing a Public Key Configuring DNS About the Domain Name System Configuration Procedures Procedure for Using a Name ServerProcedure for Using a Host File 13-4 Configuring Snmp About Snmp and the PortServer TS 8/16 Agent Configuration Procedure Web Interface Configuration Procedure Command LineConfiguration Example 14-4 Managing the OS and Configuration Upgrading the OS Firmware Web Interface Upgrading the OS Firmware Command Line Prerequisite TaskConfiguring PortServer TS 8/16 from a Remote Host When To Use Remote ConfigurationRules for Editing a Configuration file Copying the Configuration File to a HostCpconf fromhost=199.250.121.12cnfg-fle Resetting the Configuration to Defaults RadiusConfiguring Users About Configuring Users Common User FeaturesConfiguration Methods Configuring a User Web Interface Configuring a User Command Line Examples Configuration Examples Terminal Server Configuration Without RealPort ConfigurationConfiguration Notes IllustrationTerminal Server Configuration Using Autoconnection Terminal Server Configuration Using RealPort Dial-In PPP Connection Using Radius Dial-In PPP Connection Using Radius PortServer TS 8/16 Troubleshooting Symptom PortServer TS 8/16 Does Not Boot IntroductionSymptom Cannot Telnet to the PortServer TS 8/16 AssumptionsSymptom Trouble Accessing a Port Running PortServer TS 8/16 Hardware DiagnosticsProcedure Running the Post Using the LEDs Procedure Running the Post from a TerminalRunning PortServer TS 8/16 Post Troubleshooting Tftp Problems Verifying Tftp on a Unix SystemResetting PortServer TS 8/16 Configuration to Defaults Command Line ProcedureFront Panel Procedure Verifying the PortServer TS 8/16 IP Address 17-9 Checking for Duplicate IP Addresses Pinging an IP Address Verifying the Network Cabling Verifying the RealPort Process AIX Verifying the RealPort ProcessHP-UX Verifying the RealPort Process Linux Verifying the RealPort ProcessWindows NT Verifying the RealPort Service Windows 2000 Verifying the RealPort ServiceSolaris Verifying the RealPort Process Checking and Changing Port Configuration RealPortDigi Contact Information Digi International Bren Road East Minnetonka, MN

16, TS8 specifications

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