¹
Host: Tracks statistics associated with each host on the network on a
MAC-address basis. This group also contains the order in which the stations
are discovered.
¹
Host Top N: Indicates which hosts are top traffic contributors in a given
category during a given time frame. Use this object to pinpoint trouble spots, for
example, the station sending out the most broadcast frames. This group
requires the Host group.
¹
Matrix: Stores statistics about conversations between pairs of MAC addresses.
¹
Event: Controls the actions that are taken when an event occurs. RMON event
s occur when:
– A threshold (alarm) is exceeded
– A filter that was created matches a packet
The 8239 Model 1 can respond to an event by:
– Logging the event
– Generating a trap
– Logging the event and generating a trap
– Doing nothing, that is, using the event as a placeholder or to reset a
threshold
¹
Alarm: Enables you to define and set thresholds for various counters.
Thresholds can be passed in either a rising or falling direction on existing MIB
objects, primarily those in the Statistics group. An alarm is triggered when a
threshold is crossed and the alarm is passed to the Event group. The Alarm
group requires the Event group.
¹
Filter: Instructs the 8239 Model 1 to capture only those packets that match a
specific criterion. This group enables you to configure specific packet capture
criteria, for example, packets representing a particular protocol, such as IP,
IPX, SNA, or a specific MAC address.
¹
Packet Capture: Captures and uploads to the remote RMON Management
software the packets the 8239 Model 1 collected. This group requires the Filter
group.
¹
Ring-Station, Ring-Station Order, and Ring-Station Configuration groups:
Provide Token-Ring status, error, and statistics for each active station on the
segment being monitored. These groups track the order s of the station on the
segment and actively manage the stations.
¹
Source Routing Group: Collects the source routing information potentially
present in any Token-Ring data packet.
The 8239 Model 1 provides full support for these groups.
Configuring the 8239 Model 1 to Support RMON
In order to collect RMON information, the RMON group must be enabled. The
8239 Model 1 factory setting enables all of the RMON groups. Once enabled, the
status of the groups and tables is as follows.
¹
MAC-layer Statistics are set up
¹
Promiscuous Statistics are set up
¹
History: Two history control tables are set up per interface
– Short-term poll with an interval of every 30 seconds
8-6
8239 Setup and User’s Guide
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