PLANET SGSD-1022 - Manual (Page 241)

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
IP Precedence priority settings apply to all interfaces.
4.10.2.6 IP Precedence Priority
Figure 4-10-8 IP Precedence Priority page screenshot
The page includes the following fields:
Object Description
IP Precedence Priority
Table
Shows the IP Precedence to CoS map.
Class of Queue Service
Value
Maps an IP Precedence value to a CoS queue.
Note that queue “0” represents low priority and “3” represent high priority.
4.10.2.7 Mapping IP TOS Priority
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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