Dscp - 3Com 8807 Command Reference Manual

In the case of network congestion, the switch drops packets to release system
resources. And then no packets are put into long-delay queues. The following two
drop modes are available:
Tail drop mode: different queues (red, yellow and green) are allocated with
■
different drop thresholds. When these thresholds are exceeded respectively,
excessive packets will be dropped.
WRED drop mode: Drop precedence is taken into account in drop action.
■
When only min-thresholds of red, yellow and green packets are exceeded,
packets between min-thresholds and max-thresholds are dropped randomly at
a given slope. But when max-thresholds of red, yellow and green packets are
exceeded, all excessive packets will be dropped.
Example
# Set the port Ethernet3/1/1 in WRED drop mode; import WRED 0 as the
threshold.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800]interface Ethernet3/1/1
[3Com-Ethernet3/1/1] drop-mode wred 0

dscp

Syntax
dscp dscp-list : dscp-value exp-value cos-value local-precedence-value
drop-precedence
undo dscp dscp-list
View
Conform level view
Parameter
dscp-list: Original DSCP value, which can be a single value or several values, in the
range of 0 to 63. For example, you can type single DSCP value "46", or DSCP
values "0 8 10 16" (space is required between two values).
dscp-value: Modified DSCP value, in the range of 0 to 63.
exp-value: Modified EXP value, in the range of 0 to 7. EXP is MPLS priority of MPLS
packets.
cos-value: Modified 802.1p priority value, in the range of 0 to 7
local-precedence-value: Modified local precedence value, in the range of 0 to 7.
drop-precedence: Modified drop precedence value, in the range of 0 to 2.
Description
Use the dscp command to configure the "DSCP + Conform-level ->
Service-parameter" mapping table of current conform level.
Use the undo dscp command to restore default configuration of the "DSCP +
Conform-level -> Service- parameter" mapping table.
QoS Commands 247