VIMCOM ES-2226C, User Manual

Page: 147 / 291

ES-2226C User Manual
Publication date: Aug., 2008
Revision A4
131
Function name:
DSCP Setting
Function description:
In the late 1990s, the IETF redefined the meaning of the 8-bit SERVICE TYPE
field to accommodate a set of differentiated services (DS). Under the
differentiated services interpretation, the first six bits comprise a codepoint,
which is sometimes abbreviated DSCP, and the last two bits are left unused.
DSCP can form total 64 (0~63) kinds of Traffic Class based on the
arrangement of 6-bit field in DSCP of the IP packet. In the switch, user is
allowed to set up these 64 kinds of Class that belong to any of queue 0~3.
Parameter description:
DSCP Priority Mapping:
64 kinds of priority traffic as mentioned above, user can set up any of
Queue 0~3. In default, Priority 0~15 are mapping to Queue 0, Priority
16~31 are mapping to Queue 1, Priority 32~47 are mapping to Queue 0,
Priority 48~63 are mapping to Queue 0.
Fig. 3-71