VigorSwitch P2260 User’s Guide
104
2
2
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1
1
8
8
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4
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D
D
-
-
T
T
y
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p
p
e
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T
T
O
O
S
S
Function name:
TOS Delay Priority Mapping
Function description:
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 D-TYPE in TOS field of IP header of the packets received by the
switch is configured.
Parameter description:
Queue:
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.
