Protection Switchover Technologies - HPE FlexNetwork HSR6800 series Configuration Manual

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
Active and
standby
switchover
Ethernet link
aggregation
Smart Link
MSTP
RPR
RRPP
FRR
GR
Introduction
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.
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.
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, MSTP eliminates Layer 2
loops by selectively blocking redundant links in a network, and in
the meantime, allows for link redundancy.
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.
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.
FRR provides a quick per-link or per-node protection on an LSP.
Once a link or node fails on a path, FRR reroutes the path to a
new link or node to bypass the failed link or node. This can
happen as fast as 50 milliseconds minimizing data loss.
Protocols such as RIP, OSPF, IS-IS, static routing, and RSVP-TE
support this technology.
GR ensures the continuity of packet forwarding when a protocol,
such as BGP, IS-IS, OSPF, LDP, or RSVP-TE, restarts, or during
an active/standby switchover process. It needs other devices to
implement routing information backup and recovery.
3
Reference
"Configuring active
and standby
switchover"
Layer 2—LAN
Switching
Configuration Guide
"Configuring Smart
Link"
Layer 2—LAN
Switching
Configuration Guide
"Configuring RPR"
"Configuring RRPP"
Layer 3—IP Routing
Configuration Guide,
MPLS Configuration
Guide, and
configuration guide
of the corresponding
protocols
Related chapters in
Layer 3—IP Routing
Configuration Guide
and MPLS
Configuration Guide