3
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. 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 becoming aware of the changes of network
status, the application modules deal with the changes 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.
Table 3 Protection switchover technologies
Ethernet Link
Aggregation
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.
Ethernet link
aggregation
configuration in the
Layer 2—LAN
Switching
Configuration Guide
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.
Smart link
configuration in the
High Availability
Configuration Guide
As a Layer 2 management protocol, the Multiple Spanning Tree
Protocol (MSTP) eliminates Layer 2 loops by selectively blocking
redundant links in a network, and in the mean time, allows for
link redundancy.
MSTP configuration in
the Layer 2—LAN
Switching
Configuration Guide
The Rapid Ring Protection Protocol (RRPP) is a link layer
protocol designed for Ethernet rings. RRPP can prevent
broadcast storms caused by data loops when an Ethernet ring is
healthy, and rapidly restore the communication paths between
the nodes in the event that a link is disconnected on the ring.
RRPP configuration in
the High Availability
Configuration Guide
A single availability technology cannot solve all problems. Therefore, a combination of availability
technologies, chosen on the basis of detailed analysis of network environments and user requirements,
should be used 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. Also,
network availability should be considered during planning prior to building a network.
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