RMON1 Groups

RMON agents gather nine groups of statistics, ten including Token Ring, which are forwarded to a manager on request, usually via SNMP. As summarized in Figure 3-30, RMON1 agents can implement some or all of the following groups:

■ Statistics: Contains statistics such as packets sent, bytes sent, broadcast packets, multicast packets, CRC errors, runts, giants, fragments, jabbers, collisions, and so forth, for each monitored interface on the device.

■ History: Used to store periodic statistical samples for later retrieval.

■ Alarm: Used to set specific thresholds for managed objects and to trigger an event on crossing the threshold (this requires an Events group).

■ Host: Contains statistics associated with each host discovered on the network.

■ Host Top N: Contains statistics for hosts that top a list ordered by one of their observed variables.

■ Matrix: Contains statistics for conversations between sets of two addresses, including the number of packets or bytes exchanged between two hosts.

■ Filters: Contains rules for data packet filters; data packets matched by these rules generate events or are stored locally in a Packet Capture group.

■ Packet Capture: Contains data packets that match rules set in the Filters group.

■ Events: Controls the generation and notification of events from this device.

■ TokenRing: Contains the following Token Ring Extensions:

— Ring Station—Detailed statistics on individual stations

— Ring Station Order—Ordered list of stations currently on the ring

— Ring Station Configuration—Configuration information and insertion/removal data on each station

— Source Routing—Statistics on source routing, such as hop counts Figure 3-30 RMON1 Groups statistics history alarm


Real Time—Current Statistics Statistics Over Time Predetermined Threshold Watch Tracks Individual Host Statistics

5 hostTopN "N" Statistically Most Active Hosts

A< >B—Conversation Statistics


Packet Structure and Content Matching

7 filters

8 packetCapture Collection for Subsequent Analysis

9 events Reaction to Predetermined Conditions


Token Ring—RMON Extensions

Was this article helpful?

0 0
Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

Get My Free Ebook

Post a comment