R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

3
Technology
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
Technology
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