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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">6.2</b></font></td>
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<td bgcolor="#336666" width="100%"><strong><font size="2" color="#FFFFFF">
<span style="font-family: Arial">Network Management</span></font></strong><b><font face="Arial" size="2" color="#FFFFFF"> </font></b></td>
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<td bgcolor="#669999" height="25" width="18"> </td>
<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">6.2.8</font></b></td>
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<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">RMON</font></strong></td>
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<font face="Arial" size="2"> RMON is a major step forward in
Internetwork management. It defines a remote monitoring MIB that
supplements MIB-II and provides the network manager with vital
information about the network. The remarkable feature of RMON is that
while it is simply a specification of a MIB, with no changes in the
underlying SNMP protocol, it provides a significant expansion in SNMP
functionality.
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><p>
<font face="Arial" size="2"> With MIB-II, the network manager can
obtain information that is purely local to individual devices.
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"> Consider a
LAN with a number of devices on it, each with an SNMP agent. An SNMP
manager can learn of the amount of traffic into and out of each
device, but with MIB-II it cannot easily learn about the traffic on
the LAN as a whole.</font></p>
<p>
<font face="Arial" size="2">Network management in an internetworked
environment typically requires one monitor per subnetwork.</font></p>
<p>
<font face="Arial" size="2"> The RMON standard originally designated
as IETF RFC 1271, now RFC 1757, was designed to provide proactive
monitoring and diagnostics for distributed LAN-based networks.
Monitoring devices, called agents or probes, on critical network
segments allow for user-defined alarms to be created and a wealth of
vital statistics to be gathered by analyzing every frame on a segment.</font></p>
<p>
<font face="Arial" size="2"> The RMON standard divides monitoring
functions into nine groups to support Ethernet topologies and adds a
tenth group in RFC 1513 for Token Ring-unique parameters. The RMON
standard was crafted to be deployed as a distributed computing
architecture, where the agents and probes communicate with a central
management station, a client, using Simple Network Management Protocol
(SNMP). These agents have defined SNMP MIB structures for all nine or
ten Ethernet or Token Ring RMON groups, allowing interoperability
between vendors of RMON-based diagnostic tools. The RMON groups are
defined as:
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font></p>
<ul>
<li>
<font face="Arial" size="2"> <b>Statistics group</b> � Maintains
utilization and error statistics for the subnetwork or segment being
monitored. Examples are bandwidth utilization, broadcast, multicast, CRC
alignment, fragments, and so on.</font></li>
<li>
<font face="Arial" size="2"> <b>History group</b> � Holds periodic
statistical samples from the statistics group and stores them for
later retrieval. Examples are utilization, error count, and packet
count.</font></li>
<li>
<font face="Arial" size="2"> <b>Alarm group</b> � Allows the
administrator to set a sampling interval and threshold for any item
recorded by the agent. Examples are absolute or relative values and
rising or falling thresholds.</font></li>
<li>
<font face="Arial" size="2"> <b>Host group</b> � Defines the
measurement of various types of traffic to and from hosts attached
to the network. Examples are packets sent or received, bytes
sent or received, errors, and broadcast and multicast packets.</font></li>
<li>
<font face="Arial" size="2"> <b>Host TopN group</b> � Provides a
report of TopN hosts based on host group statistics.</font></li>
<li>
<font face="Arial" size="2"> <b>Traffic matrix group</b> � Stores
errors and utilization statistics for pairs of communicating nodes
of the network. Examples are errors, bytes, and packets.</font></li>
<li>
<font face="Arial" size="2"> <b>Filter group</b> � A filter engine
that generates a packet stream from frames that match the pattern
specified by the user. </font></li>
<li>
<font face="Arial" size="2"> <b>Packet capture group</b> � Defines how
packets that match filter criteria are buffered internally.</font></li>
<li>
<font face="Arial" size="2"> <b>Event group</b> � Allows the logging
of events, also called generated traps, to the manager, together with time and
date. Examples are customized reports based upon the type of alarm.</font></li>
</ul>
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<p><font color="#808080">
<a href="javascript:void(0)" onClick="window.open('../../activities/ch06/activity_6_2_8.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
<img border="0" src="../../images/media_icon.gif" width="25" height="25"></a> <b>
<a onClick="window.open('../../activities/ch06/activity_6_2_8.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');" href="javascript:void(0)">Interactive Media Activity</a></b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Matching: RMON Matching Activity</p>
<p>When the student has completed this activity, the student
will be able to understand how RMON operates and its terms and
definitions.</p>
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<p><font color="#808080">
<img border="0" src="../../images/links_icon.gif" width="25" height="25">
<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>RMON<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk648/tk362/tk560/tech_protocol_home.html">
http://www.cisco.com/en/US/tech/tk648/ tk362/tk560/tech_protocol_
home.html</a></font></p>
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