14.1.11 Jaga measurement servers

The Jaga measurement server is an active and non-discoverable PVSR module, which corresponds to Jaga agents. The measurement server doesn’t take into account the timeout and the retries values set for the equipment. Beside the basic attributes, the equipment has only a single Collector identifier (ASCII_0000_EQ_COLL_KEY) named parameter, which has to be unique in the system and preferably should consist of the letters of English alphabet, digits and the – sign.

Since the Jaga measurement server is non-discoverable, the user has to create the individual measurements one-by-one through the user interface. The measurement server expects the value of the Index parameter to be the IP address or host name that is to be pinged. The application can handle IPv4 and IPv6 addresses, although IPv6 is only supported on Linux.

In case of host names supplied the Jaga measurement server tries to resolve the names to IP addresses using DNS servers. If at least one host name cannot be resolved used DNS servers, the Jaga server search for specific files named hosts in the etc folder of PVSR as well as the certain folder depending on the operating system (%SYSTEM_ROOT%’\system32\drivers\etc\ or /etc/). Using these files the module tries to resolve the names again. The unresolved host names are printed out into the log, and the correspondent measurements are ignored and not measured.

Contrary to the other measurement server types, measurements of the Jaga measurement server type cannot be edited. The following measurement types are available at creation time:

• Availability: availability as a percentage, corresponds to the AVAIL measurement of the Jaga agent
• RTT: average round trip time in milliseconds, corresponds to the RTT measurement of the Jaga agent
• RTT MinMax: minimum and maximum round trip time in milliseconds, corresponds to the RTTMM measurement of the Jaga agent

A Jaga measurement can have the following attributes:

• Sample (sec): How often should PVSR send a ping
• Timeout (sec): Ping timeout
• Delay (sec): How many seconds should PVSR wait before sending the first ping
• Size (byte): Size of the IP payload. Its default value is 36, so the default overall size of the IP packet with header is 56 bytes.
• QoS: A number between 0 and 255. Its default value is 0. The parameter Alapesetben üres, és így a mérő szerver alapértéket veszi fel (nullát). The value of the parameter is considered by the Jaga measurement server only on Linux OS, where it is used as the value of the ToS byte.
• Timing: Optinonal parameter to define more complex measurements. It’s format consists specific clauses separated by one space character. The clauses are the following:
• Given time in 1/10 sec when a ping request is sent. Format: <time>
• Given time in 1/10 sec when a ping request is sent, the response is ignored and does not count in the measurement (i.e. the ping may fail with timeout). Format: <time>i
• The start and end times of a given interval with the count of ping requests distributed evenly in the interval. Format: <start>-<end>*<count>

When a user opens a Jaga equipment under the Measurement menu then he does not see the individual charts just yet. Instead PVSR shows so called measurement groups, each group representing one pinged address, and only by clicking on the icon of a group will its charts be visible (i.e. there is an additional hierarchy level between the equipment and measurement level).

A chart template is also created that combines the three RTT values into a single chart.

As can be seen above, the Jaga PING measurement server does not provide UPTIME data.