H3C Technologies H3C S7500E Series Switches - Manual (Page 14)

1-3
Technology Introduction Reference
BFD
Bidirectional forwarding detection (BFD) provides a single
mechanism to quickly detect and monitor the connectivity of
links or IP forwarding in networks. To improve network
performance, devices must quickly detect communication
failures to restore communication through backup paths as soon
as possible.
BFD Configuration in
the High Availability
Configuration Guide
NQA
Network Quality Analyzer (NQA) analyzes network
performance, services and service quality through sending test
packets, and provides you with network performance and
service quality parameters such as jitter, TCP connection delay,
FTP connection delay and file transfer rate.
NQA Configuration in
the Network
Management and
Monitoring
Configuration Guide
Monitor Link
Monitor link is a port collaboration function. It is usually used in
conjunction with Layer 2 topology protocols. The idea is to
monitor the states of uplink ports and adapt the up/down state of
downlink ports to the up/down state of uplink ports, triggering
link switchover on the downstream device in time.
Monitor Link
Configuration in the
High Availability
Configuration Guide
Track
The track module is used to implement collaboration between
different modules. The collaboration here involves three parts:
the application modules, the track module, and the detection
modules. These modules collaborate with one another through
collaboration entries. That is, the detection modules trigger the
application modules to perform certain operations through the
track module. More specifically, the detection modules probe
the link status, network performance and so on, and inform the
application modules of the detection result through the track
module. Upon aware of the changes of network status, the
application modules deal with the changes accordingly to avoid
communication interruption and network performance
degradation.
Track Configuration in
the High Availability
Configuration Guide
Protection Switchover Technologies
Protection switchover technologies aim at recovering network faults. They back up hardware, link,
routing, and service information for switchover in case of network faults to ensure continuity of
network services. See Table 1-3 for the details of protection switchover technologies.