ATL Telecom R1-SW Ethernet Switch - Manual (Page 162)

R1-SW24L2B User’s Manual
8-28
An RMON alarm allows you to monitor a MIB object for a desired transitory state. An alarm
periodically takes samples of the object's value and compares them to the configured thresholds.
RMON allows you to configure two types of sampling, absolute and delta:
y
Absolute sampling compares the sample value directly to the threshold. This sampling is
similar to a gauge, recording values that go up or down.
y Delta sampling subtracts the current sample value from the last sample taken, and then
compares the difference to the threshold. This sampling is similar to a counter, recording a
value that is constantly increasing.
To set an RMON alarm, use the following commands in Privileged mode:
Table 8-18 Configuring RMON alarm group
Command Task
configure terminal
1. Enter Global configuration mode.
rmon alarm <index>
<interval>
{<type> <StatisticsIndex>
|<variable>}
{delta | absolute}
{rising|falling|both}
threshold
<rising-threshold>
<falling-threshold>
event-index
<rising-event-number>
<falling-event-number>
owner <alarm-owner>
2. Set an alarm on a MIB object.
y <index>: Alarm number (1 ~ 65535)
y <interval>: MIB object monitoring interval (1-2147483647
seconds)
y <type> : Value to monitor. Select one of the following values:
- multicastPkts: The number of incoming multicast packets.
- cRCAlignErrors: The number of incoming packets with CRC
errors.
- collisions: The number of times a collision occurs while the
packet is received.
- octets: The total number of incoming octets.
- pkts: The total number of incoming packets.
- broadcastPkts: The number of incoming broadcast packets
- pkts256to511: The number of incoming packets 256 to 511 bytes in
length.
- pkts512to1023: The number of incoming packets 512 to 1023 bytes
in length.
- pkts1024to1518: The number of incoming packets 1024 to 1518
bytes in length.
- pkts64: The number of incoming packets 64 bytes in length
- pkts65to127: The number of incoming packets 65 to 127 bytes
in length.
- pkts128to255: The number of incoming packets 128 to 255
bytes in length.
y <StatisticsIndex> : The number of statistics group to get
the selected value from <type>option (0 ~ 65535).
y <variable>: OID number of the MIB object to monitor.