H3C Technologies H3C S7500E Series Switches - Manual (Page 15)

1-4
Table 1-3 Protection switchover technologies
Technology 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 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
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
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.
MSTP Configuration in
the 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.
RRPP Configuration in
the High Availability
Configuration Guide
GR
Graceful Restart (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.
Related chapters in
Layer 3 - IP Routing
Configuration Guide
and MPLS
Configuration Guide
VRRP
Virtual Router Redundancy Protocol (VRRP) is an error-tolerant
protocol, which provides highly reliable default links on multicast
and broadcast LANs such as Ethernet, avoiding network
interruption due to failure of a single link.
VRRP Configuration in
the High Availability
Configuration Guide
A single high availability technology cannot solve all availability problems in more and more complex
network environments. Therefore, various availability technologies are required to enhance network
availability on a basis of detailed analysis of network environments and user requirements. For
example, at the distribution layer, a redundancy mechanism should be adopted on edge nodes to
connect them to the corresponding nodes, and at the core layer, nodes should be meshed.
Therefore, to achieve complete high availability, network designers and managers need to take into
full consideration during the design, construction, and maintenance of a network.