R3204P16-HP Load Balancing Module High Availability Configuration Guide-6PW101

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• A detection module monitors specific objects, such as the link status, and network performance,
and informs the track module of detection results.
• Upon the detection results, the track module changes the status of the track entry and informs the
associated application module. The track module works between the application modules and the
detection modules. It hides the differences among detection modules from application modules.
• The application module takes actions when the tracked object changes its state.
The following describes how a static route is monitored through collaboration.
1. NQA monitors the reachability to 192.168.0.88.
2. When 192.168.0.88 becomes unreachable, NQA notifies it to the track module.
3. The track module notifies the state change to the static routing module
4. The static routing module sets the static route as invalid.
Supporting threshold monitoring
NQA supports threshold monitoring for performance parameters such as average delay jitter and packet
round-trip time. The performance parameters to be monitored are monitored elements. NQA monitors
threshold violations for a monitored element, and reacts to certain measurement conditions, for example,
sending trap messages to the network management server. This helps network administrators understand
the network service quality and network performance.
1. Monitored elements
Table 9 de
scribes the monitored elements and the NQA test types in which the elements can be
monitored.
Table 9 Monitored elements and NQA test types
Monitored elements Test t
yp
e su
pp
orted
Probe duration Tests excluding UDP jitter test test
Count of probe failures Tests excluding UDP jitter test test
Packet round-trip time UDP jitter test test
Count of discarded packets UDP jitter test test
One-way delay jitter (source-to-destination and
destination-to-source)
UDP jitter test test
One-way delay (source-to-destination and destination-to-source) UDP jitter test test
2. Threshold types
The consecutive threshold type is supported. The test monitors the number of consecutive times the
monitored data violates the threshold since the test group starts. If the monitored data violates the
threshold consecutively for a specified number of times, a threshold violation occurs.
3. Triggered actions
The following actions may be triggered:
• none—NQA only records events for terminal display; it does not send trap information to the
network management server.
• trap-only—NQA records events and sends trap messages to the network management server.