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Appendix F. Constant Quality
Monitoring - technical details
The FireBrick provides constant quality monitoring. The main purpose of this is to provide a graphical
representation of the performance of an interface or traffic shaper
• 100 second interval statistics available graphically as svg or png and in text as csv covering at least the last
25 hours (one day)
• Loss latency stats where available including minimum, average, and maximum latency for the 100 second
sample, and percentage packet loss.
• Throughput stats where available (e.g. interfaces, shapers ) including average tx and rx rate for 100 second
sample
Graphs can be loss/latency or throughput of both. A ping only system would only have loss/latency. An interface
or shaper normally has only throughput data.
F.1. Access to graphs and csvs
Graphs can be accessed by http using the normal web management interface. This can be used as a direct link
from a web browser, or using common tools such as curl and wget.
The web management interface (services/http) define the port, and allowed user list and also a trusted IP access
list. The CQM config defines a secret which is used to authorise untrusted access using an SHA1 hash in the
URL.
All CQM URLs are in the /cqm/ path.
F.1.1. Trusted access
To access a graph you simply need to request the URL that is the graph name, followed by the file extension.
E.g. http://host:port/cqm/circuit.png.
Table F.1. File types
Extn
Format
svg
SVG image
png
PNG image
csv
COMMA separated values list
tsv
TAB separated values list
txt
SPACE separated values list
xml
XML data
F.1.2. Dated information
Without any date the data returned is the latest. This includes the last 24 to 25 hours.
You can display data for a specific date. This only makes sense for today, and during the first couple of hours
of the day you can get yesterday in full.
The syntax is that of a date first in the form YYYY-MM-DD/, e.g. http://host:port/cqm/YYYY-MM-DD/
circuit.png.
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