GE Security GE-DS-82, Руководство пользователя

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Chapter 4: Web-Based Management
114 GE-DS-82 and 82-PoE Ethernet Managed Switch User Manual
QoS PerPort Configuration
Configure the priority level for each port. With the drop-down selection item of
Priority Type above being selected as Port-based, this control item will then be
available to set the queuing policy for each port.
Figure 80: QoS Configuration - Port-Based Priority
This page includes the following fields:
OBJECT DESCRIPTION
Port Number: Indicates port 1 to port 26.
Port Priority:
Each port has 8 priority levels—0-7 or Disable to be chosen. 7 is the
highest priority.
TOS/DSCP
TOS/DSCP priority is obtained through a 6-bit Type-of-Service (TOS) or Differentiated
Service Code Point (DSCP) to 3-bit priority mapping.
The Type of Service (TOS) octet in the IPv4 header is divided into three parts;
Precedence (3 bits), TOS (4 bits), and MBZ (1 bit). The Precedence bits indicate the
importance of a packet, whereas the TOS bits indicate how the network should make
tradeoffs between throughput, delay, reliability, and cost (as defined in RFC 1394). The
MBZ bit (for "must be zero") is currently unused and is either set to zero or just ignored.
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