R3166-R3206-HP High-End Firewalls High Availability Configuration Guide-6PW101

• 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.

NOTE:

For more information about the track module, see the chapter “Track configuration.”

Supporting delivery of traps

You can set whether to send traps to the network management server when an NQA test is performed.

When a probe fails or a test is completed, the network management server can be notified, and the

network administrator can know the network running status and performance in time through the traps

sent.

Basic NQA concepts

Test group

An NQA test group specifies test parameters including the test type, destination address, and destination

port. Each test group is uniquely identified by an administrator name and operation tag. You can

configure and schedule multiple NQA test groups to test different objects.

Test and probe

After the NQA test group starts, tests are performed at a specified interval. During each test, a specified

number of probe operations are performed. Both the test interval and the number of probe operations

per test are configurable. But only one probe operation is performed during one voice test.

Probe operations vary with NQA test types.

• During a TCP or DLSw test, one probe operation means setting up one connection.

• During a UDP jitter or a voice test, one probe operation means continuously sending a specified

number of probe packets. The number of probe packets is configurable.

• During an FTP, HTTP, DHCP or DNS test, one probe operation means uploading or downloading a

file, obtaining a web page, obtaining an IP address through DHCP, or translating a domain name

to an IP address.

• During an ICMP echo or UDP echo test, one probe operation means sending an ICMP echo request

or a UDP packet.

• During an SNMP test, one probe operation means sending one SNMPv1 packet, one SNMPv2C

packet, and one SNMPv3 packet.