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+ +	6.2		+ Network Management
	+ 6.2.8		+ RMON

+ + + + + + +

+ + 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. +

+ + With MIB-II, the network manager can + obtain information that is purely local to individual devices. + 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.

+ + Network management in an internetworked + environment typically requires one monitor per subnetwork.

+ + 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.

+ + 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: +

+ + Statistics group – Maintains + utilization and error statistics for the subnetwork or segment being + monitored. Examples are bandwidth utilization, broadcast, multicast, CRC + alignment, fragments, and so on.
+ + History group – Holds periodic + statistical samples from the statistics group and stores them for + later retrieval. Examples are utilization, error count, and packet + count.
+ + Alarm group – 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.
+ + Host group – 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.
+ + Host TopN group – Provides a + report of TopN hosts based on host group statistics.
+ + Traffic matrix group – Stores + errors and utilization statistics for pairs of communicating nodes + of the network. Examples are errors, bytes, and packets.
+ + Filter group – A filter engine + that generates a packet stream from frames that match the pattern + specified by the user.
+ + Packet capture group – Defines how + packets that match filter criteria are buffered internally.
+ + Event group – 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.

+ + + + +

+ + + + + +

+ + + Interactive Media Activity

+ +

Matching: RMON Matching Activity

When the student has completed this activity, the student + will be able to understand how RMON operates and its terms and + definitions.

+ +

+ + + + + + + + +

+ + + + + +

+ + Web Links

+ + +

RMON

+ + http://www.cisco.com/en/US/tech/tk648/ tk362/tk560/tech_protocol_ + home.html

+ +

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