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+
+<head>
+<meta http-equiv="Content-Language" content="en-us">
+<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
+<title>Content</title>
+<base target="_self">
+</head>
+
+<body background="../../images/bg.gif" topmargin="0" leftmargin="0" marginheight="0" marginwidth="0" onLoad="window.focus();" link="#808080" vlink="#808080" alink="#808080">
+
+<table border="0" cellpadding="0" cellspacing="0" width="100%">
+ <tr>
+ <td bgcolor="#336666" width="18" valign="top">
+ <img border="0" src="../../images/content_lines.gif" width="16" height="25">
+ <img border="0" src="../../images/transdot.gif" width="2" height="1"></td>
+ <td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">6.2</b></font></td>
+ <td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <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>
+ <td width="9" bgcolor="#336666"> </td>
+ </tr>
+ <tr>
+ <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>
+ <td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <td bgcolor="#669999" height="25" width="100%"><strong>
+ <font face="Arial" size="2" color="#FFFFFF">RMON</font></strong></td>
+ <td bgcolor="#669999" height="25" width="9"> </td>
+ </tr></table>
+
+<table border="0" cellpadding="0" cellspacing="0" width="95%" bordercolor="#111111">
+ <tr>
+ <td width="15"></td>
+ <td>
+
+ <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>
+ <TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
+ <TR>
+ <TD valign="top">
+ <TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <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>
+ </font><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><IMG alt="" height="2" width="1" src="../../images/s.gif"></p></TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+
+
+
+
+ <TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
+ <TR>
+ <TD valign="top">
+ <TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <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>
+
+ <p>
+ <IMG alt="" height="2" width="1" src="../../images/s.gif"></p>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE><p>
+
+ <font face="Arial" size="2"> </font></p>
+ </td>
+ </tr>
+ </table>
+
+</body>
+
+</html>
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