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-<html>
-<! by Michael R. MacFaden mrm@cisco.com >
-<title>ASNMP Overview</title>
-
-<h1>ASNMP Overview</h1>
-
-<p>The Another SNMP class library is an Object Oriented programming
-toolkit for using IETF standard network management protocols in the
-Internet. The SNMP protocol is perhaps the most ubiquitous management
-protocol running on most very device or application deployed in the
-modern network today.
-
-<p>ASNMP is targeted to programmers that want to write command and
-control (C&C) applications. C&C Applications communicate with
-a variety of objects:
-<sl>
-<li>network devices such as ATM switches, Internet routers,
-LAN bridges and LAN printers
-<li>Routing protocols such as OSPF
-<li>database servers such as ORACLE or Informix.
-
-<p>ASNMP Version 1 implements a blocking SNMP Version 1 with some
-Version 2c additions (Counter32, Counter64 SMI values). See
-SNMP Version 1 as defined in the IETF Request for Comments (RFC)
-<sl>
-<li>1155
-<li>1157
-<li>1213
-<li>1215
-<sl>
-<p>Also see the RFC 1902 spec for new SMI datatypes such as Counter64.
-
-<p>ASNMP is built using the CMU SNMP and HP SNMP++ as the base
-classes then modified for use in the ACE framework. About 10% of the API
-changed during code rework. See ASNMP/asnmp/ChangeLog for details.
-
-<p>ASNMP can be used for either manager applications or agent applications.
-The <i>Snmp</i> class contains the interface for manager applications. The
-<i>sagent</i> class contains the interface for agent applications. A
-trivial agent that implements the mib II system group per rfc1213 is
-in the agents/ directory.
-
-<h2>Class Heirarchy</h2>
-
-<pre>
-UdpTarget - Defines a collection of attributes needed to define a
- communications session with an SNMP agent
- This includes network address, response timeout, etc.
-
-Snmp - A logical session between NM app and agent. Provides the
- commands get, get_next, trap. Manages transactions between app and
- server.
-
-Pdu - A container object that represents an SNMP Protocol Data Unit.
- A Pdu contains a command (get,getnext,trap) Varbind List list,
- a community string.
-
-Vb - Aka Varbind or Variable Binding. A pdu can have zero,
- one or more of these. A Vb consists of an Oid to identify
- the variable and a value corresponding to one of the SMI values.
- The oid/value binding is defined in a MIB file (RFC 1155)
- Agents hava a MIB file that defines what each variable means.
- Most agents implement MIB II as defined in RFC 1156.
-
-<p>The Structure of Managment Information (SMI) datatypes
-and related types are:
-<ul>
-<li>Address->IpAddress->UdpAddress as well as MAC, IPX, IPXSOCK, Netbios
-<li>Unsigned Integer
-<li>Gauge32
-<li>Integer32
-<li>Counter32
-<li>Counter64
-<li>TimeTicks
-<li>OctetStr
-<li>Oid
-</ul>
-
-<hr>
-
-<h2>Sample program</h2>
-<p>A sample Object to get obtain an Agent's Systems' Description
-given an network address and a community string.
-
-class system_id {
- public:
- system_id(UdpAddress addr, OctetStr read_community_string)
- {
- UdpTarget tgt;
- Snmp snmp;
- Pdu pdu;
- Oid oid("1.3.6.1.2.1.1.1.0");
- Vb vb(oid);
- tgt.set_address(addr);
- tgt.set_read_community(read_community_string);
- pdu += vb;
-
- if (snmp.get(pdu, tgt) == 0) {
- pdu.get_vb(vb, 0);
- vb.get_value(desc_);
- }
- else
- desc_ = "<error - no value set>"
- }
-
- int get_description(OctetStr& description) {
- description = desc_;
- return 0;
- }
-
-private:
- OctetStr desc_;
-};
-
-<h1>Future Directions</h1>
-<p>Here are some areas for further work
-<sl>
-<li>Add OO mib parser and mib code generator
-<li>Collapse the CMU/HP code into one set of classes.
-<li>Add full V2c support.
-<li>Size/Speed improvements
-</sl>
-
-<h1>References</h1>
-<ul>
-<li><a href="http://www.ece.ucdavis.edu/ucd-snmp/">UCD SNMP</a>
-<li><a href="news://comp.protocols.snmp">comp.protocols.snmp</a>
-<li><a href="http://snmp.cs.utwente.nl">University of Twente</a>
-<li><a href="http://www.cis.ohio-state.edu/hypertext/faq/bngusenet/comp/protocols/snmp/top.html">SNMP FAQ</a>
-<li><a href="http://www.adventnet.com/">Java based SNMP tools from Ardent</a>
-<li><a href="http://misa.zurich.ibm.com/Webbin/">IBM SNMP/CMIP research</a>
-</ul>
-</html>