H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 11)

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Table 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 an aggregate link. It allows for link
redundancy because the member physical links can dynamically
back up one another.
Layer 2 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.
Layer 2 Configuration
Guide
Stateful Failover
Two devices back up the services of each other to make sure that
the services on them are consistent. If one device fails, the other
device can take over the services by using VRRP or dynamic routing
protocols. Because the other device has already backed up the
services, service traffic can pass through the other device, avoiding
service interruption.
Chapter "Configuring
stateful failover"
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.
Chapter "Configuring
VRRP"
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.