LevelOne GSW-2690 Manuale Utente

 

T-Type TOS 

IP TOS Priority affect TOS fields of IP header, you can find it has 8-bit 
SERVICE TYPE field that specifies how the datagram should be handled. The 
field could be divided into six subfields as follows, PRECEDENCE (3 bits), D-
Type (Delay Priority, 1 bit ), T-Type (Throughput Priority, 1bit), R-Type 
(Reliability Priority, 1bit ), M-Type (Monetary Cost Priority, 1bit ), and UNUSED. 
PRECEDENCE 3-bits can arrange 8 kinds of priorities corresponding to the 
0~7 priority in the following priority diagram. TOS Delay Priority Mapping 
works while T-TYPE in TOS field of IP header of the packets received by the 
switch is configured. 

 

TOS Throughput Priority Mapping: 

Each Priority can select any of Queue 0 ~ Queue 3. In Default, Priority 0 
is mapping to Queue 0, Priority 1 is mapping to Queue 0, Priority 2 is 
mapping to Queue 1, Priority 3 is mapping to Queue 1, Priority 4 is 
mapping to Queue 2, Priority 5 is mapping to Queue 2, Priority 6 is 
mapping to Queue 3, and Priority 0 is mapping to Queue 3. 

               Fig. 3-65