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A UDP jitter or a voice operation sends a specific number of probe packets. The number of probe
packets is configurable with the probe packet-number command.
An FTP operation uploads or downloads a file.
An HTTP operation gets a Web page.
A DHCP operation gets an IP address through DHCP.
A DNS operation translates a domain name to an IP address.
An ICMP echo operation sends an ICMP echo request.
A UDP echo operation sends a UDP packet.
An SNMP operation sends one SNMPv1 packet, one SNMPv2c packet, and one SNMPv3 packet.
A path jitter operation is accomplished in the following steps:
a.
The operation uses tracert to obtain the path from the NQA client to the destination. At
maximum of 64 hops can be detected.
b.
The NQA client sends ICMP echo requests to each hop along the path. The number of ICMP
echo requests is configurable with the probe packet-number command.

Collaboration

NQA can collaborate with the Track module to notify application modules of state or performance
changes so that the application modules can take predefined actions.
Figure 40 Collaboration
Detection
module
NQA
The following describes how a static route destined for 192.168.0.88 is monitored through collaboration:
1.
NQA monitors the reachability to 192.168.0.88.
2.
When 192.168.0.88 becomes unreachable, NQA notifies the Track module of the change.
3.
The Track module notifies the static routing module of the state change.
4.
The static routing module sets the static route as invalid according to a predefined action.
For more information about collaboration, see High Availability Configuration Guide.
Threshold monitoring
Threshold monitoring enables the NQA client to display results or send trap messages to the network
management station (NMS) when the performance metrics that an NQA operation gathers violate the
specified thresholds.
Associates with an
NQA entry
Track
Sends the
detection results
Application modules
Associates with a
track entry
Static routing
Sends the track
entry status
Policy-based
120
VRRP
routing

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