H3C Technologies H3C S12500-X Series Switches - Manual (Page 78)

70
Configuring Track
Overview
The Track module works between application modules and detection modules, as shown in Figure 20 . It
shields the differences between various detection modules from application modules.
Collaboration is enabled after you associate the Track module with a detection module and an
application module. The detection module probes specific objects such as interface status, link status,
network reachability, and network performance, and informs the Track module of detection results. The
Track module sends the detection results to the associated application module. When notified of changes
for the tracked object, the application modules can react to avoid communication interruption and
network performance degradation.
Figure 20 Collaboration through the Track module
Collaboration fundamentals
The Track module collaborates with detection modules and application modules:
• Collaboration between the Track module and a detection module
• Collaboration between the Track module and an application module
Collaboration between the Track module and a detection module
The detection module sends the detection result of the associated tracked object to the Track module.
Depending on the result, the Track module changes the status of the track entry:
• If the tracked object functions correctly (for example, the target interface is up or the target network
is reachable), the state of the track entry is Positive.
• If the tracked object does not function correctly (for example, the target interface is down or the
target network is unreachable), the state of the track entry is Negative.
• If the detection result is not valid (for example, the NQA test group that is associated with the track
entry does not exist), the state of the track entry is NotReady.
The following detection modules can be associated with the Track module:
Application modules
Policy-based
routing
Static route
VRRP
Detection
modules
CFD
Interface
management
Sends the
detection result
Sends the track
entry status
Track
module
Associates with a
detection entry
Associates with a
track entry
NQA
BFD