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Appendix J. 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 - typically used for broadband lines on L2TP.
• 100 second interval statistics available graphically as png and in text as csv covering at least the last 25
hours (one day)
• Loss latency stats where available (e.g. LCP echos on L2TP broadband lines) including minimum, average,
and maximum latency for the 100 second sample, and percentage packet loss.
• Throughput stats where available (e.g. interfaces, shapers , L2TP broadband lines ) 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 L2TP
broadband line has both. An interface or shaper normally has only throughput data.
J.1. Broadband back-haul providers
When using the FB2700 as an LNS the CQM graphs are invaluable for diagnosing line faults. They are useful
to the ISP but also useful to the back-haul provider which is often a separate company (e.g. BT or Be). We
recommend that you consider providing access to graphs for live circuits and archived data to your back-
haul provider when discussing faults with them. FireBrick are working with several ISPs to ensure back-haul
providers are aware of the CQM graphs and how to use them to assist in diagnosis.
J.2. 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.
J.2.1. 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 J.1. File types
Extn
Format
png
PNG image
csv
COMMA separated values list
tsv
TAB separated values list
txt
SPACE separated values list
xml
XML data
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