3Com S7902E, Руководство по настройке

Страница: 2250 / 2621

1-2
At present, the detection modules that can collaborate with the track module include the Network
Quality Analyzer (NQA) module, the Bidirectional Forwarding Detection (BFD) module and the interface
management module.
z
Refer to NQA Configuration in the System Volume for details of NQA.
z
Refer to BFD Configuration in the High Availability Volume for details of BFD.
z
The interface management module is used to monitor the physical status or Layer 3 protocol status
of an interface. When the physical status or Layer 3 protocol status of an interface is up, the status
of a track entry is Positive; when the physical status or Layer 3 protocol status of an interface is
down, the status of a track entry is Negative.
Collaboration Between the Track Module and the Application Modules
You can establish the collaboration between the track module and the application modules through
configuration. If the status of the track entry changes, the track module notifies the application modules
to deal with the change accordingly.
At present, the application modules that can collaborate with the track module include:
z
VRRP( Virtual Router Redundancy Protocol )
z
Static routing
In some cases, when the status of the track entry changes, if the track module notifies the application
modules immediately, communication may be interrupted because routes cannot be recovered in time.
For example, the master in a VRRP group monitors the uplink interface through the track module. When
the uplink interface fails, the track module notifies the master to reduce its priority so that a backup with
a higher priority can preempt as the master to forward packets. When the uplink interface recovers, if
the track module notifies the original master to restore its priority immediately, the master will forward
packets immediately; however, the uplink route has not been recovered yet, which may result in packet
forwarding failure. In this case, you can configure that the track module notifies the application modules
of the track entry status change after a specified delay time.
Track Configuration Task List
To implement the collaboration function, you need to establish collaboration between the track module
and the detection modules, and between the track module and the application modules.
Complete these tasks to configure track module:
Task Remarks
Configuring Track-NQA Collaboration
Configuring Track-BFD Collaboration
Configuring Collaboration
Between the Track
Module and the Detection
Modules
Configuring Collaboration Between the
Track Module and the Interface
Management Module
Required
Use any of the approaches
Configuring Track-VRRP Collaboration Configuring Collaboration
Between the Track
Module and the
Application Modules
Configuring Track-Static Routing
Collaboration
Required
Use any of the two
approaches