GE 82-POE, GE-DS-82 user manual Tos/Dscp, QoS PerPort Configuration

Chapter 4: Web-Based Management

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.

GE-DS-82 and 82-PoE Ethernet Managed Switch User Manual 113