Protection Switchover Technologies - H3C S9500E Series Configuration Manual

Technology
NQA
Monitor link
Track

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 failures, to ensure continuity of
network services. See Table 3 for the details of protection switchover technologies.
Table 3 Protection switchover technologies
Technology
Active and
standby
switchover
Ethernet link
aggregation
Introduction
NQA analyzes network performance, services and service quality by
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.
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.
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. In other
words, 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. Once notified of network
status changes, the application modules deal with the changes to
avoid communication interruption and network performance
degradation.
Introduction
Devices supporting active and standby switchover are normally
equipped with two main boards: one is the AMB and the other is
the SMB. The configurations on the SMB are the same as those on
the AMB. When the AMB fails or is plugged out, the SMB
automatically becomes the AMB to ensure non-stop operating of the
devices.
Ethernet link aggregation, most often simply called link
aggregation, aggregates multiple physical Ethernet links into one
logical link to increase link bandwidth beyond the limits of any one
single link. This logical link is called an aggregate link. It allows for
link redundancy because the member physical links can
dynamically back up one another.
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Reference
Network
Management and
Monitoring
Configuration
Guide/NQA
Configuration
High Availability
Configuration
Guide/Monitor Link
Configuration
High Availability
Configuration
Guide/Track
Configuration
Reference
High Availability
Configuration
Guide/Active and
Standby Switchover
Configuration
Layer 2 – LAN
Switching
Configuration
Guide/Ethernet Link
Aggregation