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H3C Technologies H3C WX3000E Series Wireless Switches User 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.