ZyXEL Communications ES-4024A User Manual

Page 116

ES-4024A Series Switch Support Notes

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requirements. Each group is optional so that vendors do not need to support all

the groups within the Management Information Base (MIB). Some RMON

groups require support of other RMON groups to function properly. Table 1

summarizes the nine monitoring groups specified in the RFC 1757 Ethernet

RMON MIB.

Table 1: RMON Monitoring Groups

RMON 1
MIB
Group

Function

Elements

Statistics Contains statistics

measured by the
probe for each
monitored interface
on this device.

Packets dropped, packets sent, bytes
sent (octets), broadcast packets,
multicast packets, CRC errors, runts,
giants, fragments, jabbers, collisions,
and counters for packets ranging from
64 to 128, 128 to 256, 256 to 512, 512
to 1024, and 1024 to 1518 bytes.

History

Records periodic
statistical samples
from a network and
stores for retrieval.

Sample period, number of samples,
items sampled.

Alarm

Periodically takes
statistical samples
and compares them
with set thresholds for
events generation.

Includes the alarm table and requires
the implementation of the event group.
Alarm type, interval, starting threshold,
stop threshold.

Host

Contains statistics
associated with each
host discovered on
the network.

Host address, packets, and bytes
received and transmitted, as well as
broadcast, multicast, and error packets.

HostTopN Prepares tables that

describe the top
hosts.

Statistics, host(s), sample start and
stop periods, rate base, duration.