Contemporary-control-systems Compact Managed Switches Software Manual for Web B Uživatelský manuál stáhnout pdf (Strana 36)

TD020851-0MG

4.4.7.3 Configure TOS/DiffServ Priority

When configuring the TOS/DiffServ priority, a detailed screen of three tables appears.

Each table — upper, middle and lower — is discussed and illustrated individually in turn.

At the bottom of the screen there are two links to the other types of QoS.

Upper Table — Configure TOS/DiffServ Priority

The user must first decide which service to be used: TOS or DiffServ. This choice is

made in the top-right portion of the upper table shown in the default screen of Figure 31

which displays a screen for an 8-port model. Screens for 16- and 24-port models

function the same — but simply display more ports.

The IP header contains an eight-bit field originally known as the Type of Service (TOS)

field — but TOS priority had little acceptance. Subsequently, these eight bits were

redefined to become the more popular Differentiated Services (DiffServ) field.

Regardless of the type of QoS chosen, each port (disabled by default) must be

individually enabled to establish its QoS service.

After the choice of service has been made and the port behaviours determined, these

parameters must be registered by clicking the “Apply” button immediately below the

table before editing the other tables or leaving this screen or refreshing this screen.

Otherwise, the upper-table settings will be lost.

Figure 31 — Configure TOS/DiffServ Priority for an 8-port Switch

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 82 83

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Contemporary-control-systems Compact Managed Switches Software Manual for Web B Uživatelský manuál Strana 36