Protection Switchover Technologies - HP A5830 series Configuration Manual

Technology
Track

Protection switchover technologies

Protection switchover technologies aim at recovering network faults. To ensure continuity of network
services, they back up hardware, link, routing, and service information for switchover in case of network
faults.
Table 3 Protection switchover technologies
Technology
Ethernet Link
Aggregation
Smart Link
MSTP
RRPP
FRR
Introduction
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.
Introduction
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.
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.
As a Layer 2 management protocol, the MSTP eliminates Layer 2
loops by selectively blocking redundant links in a network, and in
the meantime, allows for link redundancy.
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. It can also rapidly restore the
communication paths between the nodes in the event that a link is
disconnected on the ring.
FRR provides a quick per-link or per-node protection on an LSP. In
this approach, once a link or node fails on a path, FRR comes up
to reroute the path to a new link or node to bypass the failed link
or node. This can happen in as fast as 50 milliseconds,
minimizing data loss. Protocols such as RIP, OSPF, IS-IS, and
static routing support this technology.
9
Reference
Track configuration
in High Availability
Configuration Guide
Reference
Ethernet link
aggregation
configuration in Layer
2—LAN Switching
Configuration Guide
Smart link
configuration in High
Availability
Configuration Guide
Spanning tree
configuration in Layer
2—LAN Switching
Configuration Guide
RRPP configuration in
High Availability
Configuration Guide
Layer 3—IP Routing
Configuration
Guide/Configuration
Guide of the
corresponding
protocols