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Cisco ONS 15454 SDH Procedure Guide, R7.0
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Chapter 21 DLPs D400 to D499
DLP- D441 Create Ethernet RMON Alarm Thresholds
Step 8
From the Alarm Type drop-down list, indicate whether the event will be triggered by the rising threshold,
falling threshold, or both the rising and falling thresholds.
Step 9
From the Sample Type drop-down list,
choose either
Relative
or
Absolute
. Relative restricts the
threshold to use the number of occurrences in the user-set sample period. Absolute sets the threshold to
use the total number of occurrences, regardless of time period.
Step 10
Type in an appropriate number of seconds in the Sample Period field.
Step 11
Type in the appropriate number of occurrences in the Rising Threshold field.
For a rising type of alarm, the measured value must move from below the falling threshold to above the
rising threshold. For example, if a network is running below a falling threshold of 400 collisions every
15 seconds and a problem causes 1001 collisions in 15 seconds, the excess collisions trigger an alarm.
Step 12
Enter the appropriate number of occurrences in the Falling Threshold field. In most cases a falling
threshold is set lower than the rising threshold.
A falling threshold is the counterpart to a rising threshold. When the number of occurrences is above the
rising threshold and then drops below a falling threshold, it resets the rising threshold. For example,
when the network problem that caused 1001 collisions in 15 seconds subsides and creates only
799 collisions in 15 seconds, occurrences fall below a falling threshold of 800 collisions. This resets the
rising threshold so that if network collisions again spike over a 1000 per 15 second period, an event again
triggers when the rising threshold is crossed. An event is triggered only the first time a rising threshold
is exceeded (otherwise a single network problem might cause a rising threshold to be exceeded multiple
times and cause a flood of events).
Step 13
Click
OK
to complete the procedure.
etherStatsPkts1024to1518Octets
Total number of packets received (including error packets) that
were 1024 to 1518 octets in length.
etherStatsJabbers
Total number of packets longer than 1518 octets that were not an
integral number of octets or had a bad FCS.
etherStatsCollisions
Best estimate of the total number of collisions on this segment.
etherStatsCollisionFrames
Best estimate of the total number of frame collisions on this
segment.
etherStatsCRCAlignErrors
Total number of packets with a length between
64 and 1518 octets, inclusive, that had a bad FCS or were not an
integral number of octets in length.
receivePauseFrames
(G-Series only) The number of received IEEE 802.x pause
frames.
transmitPauseFrames
(G-Series only) The number of transmitted IEEE 802.x pause
frames.
receivePktsDroppedInternalCongest
ion
(G-Series only) The number of received framed dropped due to
frame buffer overflow as well as other reasons.
transmitPktsDroppedInternalConge
stion
(G-Series only) The number of frames dropped in the transmit
direction due to frame buffer overflow as well as other reasons.
txTotalPkts
Total number of transmit packets.
rxTotalPkts
Total number of receive packets.
Table 21-2
Ethernet Threshold Variables (MIBs) (continued)
Variable
Definition
Summary of Contents for ONS 15454 SDH
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