Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 394)

This example shows that only a congestion alert at the switch level has been
set:
switch:admin> bottleneckmon --status
Bottleneck detection - Enabled
==============================
Switch-wide sub-second latency bottleneck criterion:
====================================================
Time threshold - 0.800
Severity threshold - 50.000
Switch-wide alerting parameters:
============================
Alerts - Congestion only
Congestion threshold for alert - 0.800
Averaging time for alert - 300 seconds
Quiet time for alert - 300 seconds
Per-port overrides for alert parameters:
========================================
Port Alerts? LatencyThresh CongestionThresh Time (s) QTime(s)
================================================================================
1 Y 0.100 0.800 300 300
2 C
-- 0.800 600 600
3 L
0.100 -- 300 300
4 N -- -- -- --
NOTE
If there are no per-port overrides, the “Per-port overrides for alert parameters”
section is not displayed.
Refer to Enabling bottleneck detection on a switch on page 392 for instructions
on enabling bottleneck detection.
Setting bottleneck detection alerts
You can configure Fabric OS to log per-port alerts based on the latency and congestion history of the
port. Alerts are generated based on the number of affected seconds over a specified period of time. If
the number of affected seconds is higher than the threshold, an alert is generated. This evaluation is
done independently for latency and congestion.
NOTE
A congestion bottleneck detection alert is generated whenever a frame timeout occurs irrespective of
the number of affected seconds in the observation window.
The following bottleneckmon -alert parameters determine whether an alert is generated and the
reason for the alert.
• The -time parameter specifies the time window. For this example, -time equals 12 seconds.
• The -cthresh and -lthresh parameters specify the thresholds on number of affected seconds that
trigger alerts for congestion and latency bottlenecks, respectively.
The following example uses the default values for these parameters, where -cthresh is 0.8 (80%) and
-lthresh is 0.1 (10%). as shown in the following figure. This figure shows a period of 12 seconds in
Setting bottleneck detection alerts
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