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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><link rel="STYLESHEET" type="text/css" href="wrs.css"><title> The WindNet SNMPv1/v2c Agent </title></head><body bgcolor="FFFFFF"><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a></a><a href="c-agent.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-agent.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-agent2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p><font face="Helvetica, sans-serif" class="sans"><h3 class="H2"><i><a name="83425">4.1 Introduction</a></i></h3></font><dl class="margin"><dl class="margin"><dd><p class="Body"><a name="84313"> </a>WindNet SNMPv1/v2c allows a VxWorks target to function with an extensible SNMP version-1 and version-2c agent, allowing the target itself to be remotely managed and configured by SNMPv1 or SNMPv2c Network Management Stations. The target agent provides support for the networking objects defined by the MIB-II standard.</p></dl></dl><dl class="margin"><dd><table border="0" cellpadding="0" cellspacing="0"><tr valign="top"><td valign="top" width="40"><a name="85487"><br></a><img border="0" alt="*" src="icons/note.gif"> </td><td><div class="Note"><hr><b class="symbol_UC">NOTE: </b>The WindNet SNMP agent optionally supports the notion of a distributed SNMP agent. That is, an SNMP agent that consists of a master agent working together with one or more subagents. For more information on using this functionality, see <a href="c-sub_agents.html#84506"><i class="title">7. SNMP Distributed Agents</i></a>. <hr></div></td></tr></table><dl class="margin"><dd><p class="Body"><a name="83426"> </a>The target agent consists of several functional units working in tandem. Generally, a packet is sent by a Network Management Station across the UDP layer of a network connection. The packet arrives at the agent via UDP. The agent accepts the packet and decodes it into a buffer, translating the incoming packet in ASN.1 format into a C structure. The structure is processed, and a response is formed. The response is then encoded into a packet in ASN.1 format and sent back across the UDP connection. (For a more detailed discussion, see <a href="c-agent11.html#83986"><i class="title">4.11 Request Processing</i></a>.)</p><dd><p class="Body"><a name="83430"> </a>MIB extensions may be defined by the programmer and compiled into the target agent using the MIB compiler <b class="command">mibcomp</b> (<a href="c-extend3.html#83539"><i class="title">6.3 Compile-time MIB Extensions</i></a>). Additionally, a WindNet SNMPv1/v2c view-configuration API (part of <b class="library">snmpdLib</b>; see <a href="c-agent9.html#83916"><i class="title">4.9 View Tables</i></a>) allows a Network Management Station user to access selective views of the MIB data tree using view tables (<a href="c-agent9.html#83916"><i class="title">4.9 View Tables</i></a>). Agent designers have the ability to modify the processing sequence of a <b class="command">set</b> request by defining hooks (<a href="c-agent8.html#83905"><i class="title">4.8 Hooks</i></a>), to modify the information base itself by dynamically adding parameters (<i class="emphasis">object identifiers</i>) to the MIB (<a href="c-extend4.html#84262"><i class="title">6.4 Dynamic MIB Additions</i></a>), and to allow the agent to respond to significant events by defining traps (<a href="c-agent7.html#83785"><i class="title">4.7 Traps</i></a>). </p><dd><p class="Body"><a name="83452"> </a>The flow of information among the various routines which make up the agent are shown in <a href="c-agent12.html#84047"><i class="title">4.12 SNMP Agent Data Flow</i></a>.</p></dl></dl><a name="foot"><hr></a><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a></a><a href="c-agent.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-agent.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-agent2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p></body></html><!---by WRS Documentation (), Wind River Systems, Inc. conversion tool: Quadralay WebWorks Publisher 4.0.11 template: CSS Template, Jan 1998 - Jefro --->⌨️ 快捷键说明
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