3Com 3C17203 - SuperStack 3 Switch 4400, Руководство по внедрению

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Switch Features Explained 21
For more information about STP and RSTP, see Chapter 4 “Using
Resilience Features” .
Switch Database The Switch Database is an integral part of the Switch and is used by the
Switch to determine if a packet should be forwarded, and which port
should transmit the packet if it is to be forwarded.
For more information about the Switch Database, see Chapter 5 “Using
the Switch Database” .
Traffic Prioritization Using the traffic prioritization capabilities of your Switch provides Quality
of Service (QoS) to your network through increased reliability of data
delivery. You can prioritize traffic on your network to ensure that high
priority data is transmitted with minimum delay.
Traffic can be controlled by a set of rules to obtain the required Quality of
Service for your network. The rules define different types of traffic and
specify how each type should be treated as it passes through the Switch,
for example, prioritized or discarded. Being able to define exactly how
you want your Switch to treat selected applications, devices, users and
types of traffic allows you to have more control over your network.
For more information about traffic prioritization, see Chapter 6 “Using
Traffic Prioritization” .
Roving Analysis Roving analysis is a system that allows you to attach a network analyzer
to one port and use it to monitor the traffic of other ports on the Switch.
The system works by enabling you to define an analysis port (the port
that is connected to the analyzer), and a monitor port (the port that is to
be monitored). Once the pair are defined, and you start monitoring, the
Switch takes all the traffic going in and out of the monitor port and
copies it to the analysis port.
You can use roving analysis when you need the functions of a network
analyzer, but do not want to change the physical characteristics of the
monitored segment by attaching an analyzer to that segment.
For more information about roving analysis, see Chapter 7 “Status
Monitoring and Statistics” .