Qtech QSW-2800v2 [183/230] Chapter8

Qtech QSW-2800v2 [183/230] Chapter8
Chapter8 Reliability Configuration
8-1
Chapter8
Reliability Configuration
8.1 Summary
This chapter mainly introduces MSTP AND RLINK function of QSW-2800 in the
network and affords the reliability configuration method.
This chapter includes the following section.
Content
Page
8.1 Summary
8-1
8.2 MSTP Configuration
8-1
8.3 RLINK Configuration
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8.2 MSTP Configuration
8.2.1 STP Introduction
STP Generation Reason
The basic idea of STP protocol is very simple. There will be no loop of the tree grown
in nature. And then STP defines the Root Bridge, Root Port, Designated Port, Path
Cost and concepts like these. Its purpose is that it can cut out the redundant loops by
constructing a tree and at the same time it can implement the link backup and path
optimization. The algorithm used to construct the tree is called Spanning Tree
Algorithm.
In order to implement the function, network bridges must have some information
interaction with each other. These information interaction units are called BPDU
(Bridge Protocol Data Unit). STP BPDU is a sort of Layer-2 message and its
destination MAC is multicast address of 01-80-C2-00-00-00. All the bridges which
support STP will receive and deal with the BPDU message. The data field of the
message has all useful information used for calculating STP.
STP Working Process

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