R3303-HP HSR6800 Routers High Availability Configuration Guide

3
Technolo
gy
Introduction Reference
Track
The Track module implements collaboration between different
modules. The collaboration involves three sets of modules:
application, Track, and detection. These modules collaborate with
one another through collaboration entries. The detection modules
trigger the application modules to perform certain operations through
the Track module. The detection modules probe such items as link
status and network performance, and inform the application modules
of the detection result through the Track module. Once notified of
network status changes, the application modules use the changes to
avoid communication interruption and network performance
degradation.
"Configuring
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 faults to ensure continuity of network services.
A single availability technology cannot solve all problems. You should use a combination of availability
technologies, chosen on the basis of detailed analysis of network environments and user requirements,
to enhance network availability. For example, access-layer devices should be connected to
distribution-layer devices over redundant links, and core-layer devices should be fully meshed. Network
availability should be considered during the planning stage.
Table 3 Protection switchover technologies
Technolo
gy
Introduction Reference
Active and
standby
switchover
Devices supporting active and standby switchover are typically
equipped with two main boards, with one being the active MPU,
and the other being the standby MPU. The configurations on the
standby MPU are the same as those on the active MPU. When the
active MPU fails or is removed, the standby MPU automatically
becomes the active MPU to ensure non-stop operating of the
devices.
"Configuring active
and standby
switchover"
Ethernet link
aggregation
Ethernet link aggregation, or 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 an aggregate link. It allows for link redundancy because the
member physical links can dynamically back up one another.
Layer 2—LAN
Switching
Configuration Guide
Smart Link
Smart Link is a feature developed to address the slow convergence
issue with STP. It provides link redundancy as well as fast
convergence in a dual uplink network, allowing the backup link to
take over quickly when the primary link fails.
"Configuring Smart
Link"
MSTP
As a Layer 2 management protocol, MSTP eliminates Layer 2 loops
by selectively blocking redundant links in a network, and in the
meantime, allows for link redundancy.
Layer 2—LAN
Switching
Configuration Guide
RPR
RPR is a new MAC layer protocol designed for transferring mass
data services over MANs. It can operate on SONET/SDH, DWDM
and Ethernet to provide flexible and efficient networking schemes
for broadband IP MANs carriers.
"Configuring RPR"