H3C S5120-EI Series - Protection Switchover Technologies

3
Technolo
gy
Introduction Reference
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. Once notified of network status changes, the
application modules deal with the changes to avoid
communication interruption and network performance
degradation.
"Configuring track" in
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
Technolo
gy
Introduction Reference
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 an aggregate link. It allows for link
redundancy because the member physical links can dynamically
back up one another.
"Configuring Ethernet
ink aggregation" in
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" in High
Availability
Configuration Guide
MSTP
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.
"Configuring
spanning tree" in
Layer 2—LAN
Switching
Configuration Guide
RRPP
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.
"Configuring RRPP" in
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.