Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 357
Description This command configures the error rate threshold at which the signal fail condition is declared
on an Ethernet interface. The error rate threshold value is the ratio of errored frames over total
frames received, which is calculated as an average over the time set by the sliding window.
The value is calculated as M × 10E-N, where M is the optional multiplier used to increase the
error ratio, and N is the rate of errored frames allowed (threshold). For example, 3 × 10E-3
sets the error rate threshold at 3 errored frames per 1000 total frames received. If no window-
size is configured, a default of 10-s is used. The CRC errors on the interface are sampled
once per second.
The multiplier keyword is optional. If the multiplier keyword is omitted, the default value of 1
is used.
The no form of the command disables sf-threshold monitoring.
Default no sf-threshold
Parameters threshold — specifies the threshold value
Values 1 to 9
multiplier — specifies the multiplier value
Values 1 to 9
window-size
Syntax window-size seconds
no window-size
Context config>port>ethernet>crc-monitor
Description This command configures the sliding window size over which the Ethernet frames are
sampled to detect signal fail or signal degrade conditions. The command is used jointly with
the sd-threshold and the sf-threshold commands.
A sliding window (window-size) is used to calculate a statistical average of CRC error
statistics collected every second. Each second, the oldest statistics are dropped from the
calculation. For example, if the default 10-s sliding window is configured, at the 11th second
the oldest second of statistical data is dropped and the 11th second is included. This sliding
average is compared against the configured SD and SF thresholds to determine if the error
rate over the window exceeds one or both of the thresholds, which will generate an alarm and
log event.
The no form of the command disables window-size monitoring.
Default 10
Parameters seconds — specifies the size of the sliding window over which the errors are measured
Values 5 to 60
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