3com MSR 20-20 참조 매뉴얼

C

HAPTER

 121: WRED C

ONFIGURATION

 C

OMMANDS

[Sysname-Ethernet1/0] qos wred dscp 63 low-limit 20 high-limit 40 di

scard-probability 15 

qos wred ip-precedence ip-precedence low-limit low-limit high-limit high-limit 
discard-probability discard-prob

undo qos wred ip-precedence ip-precedence

Interface view

ip-precedence ip-precedence: Specifies an IP precedence, in the range 0 to 7;

low-limit low-limit: Specifies the lower threshold, in the range 1 to 1024. This 
argument is 10 by default.

high-limit high-limit: Specifies the higher threshold, in the range 1 to 1024. This 
argument is 30 by default.

discard-probability discard-prob: Specifies the drop probability denominator, in 
the range 1 to 255. This argument is 10 by default.

Use the qos wred ip-precedence command to configure the lower threshold, 
the higher threshold, and the drop probability denominator for an IP precedence 
value.

Use the undo qos wred ip-precedence command to restore the default.

WRED parameters can be set only after the qos wfq command has been used to 
apply WFQ and the qos wred enable command has been used to apply IP 
precedence-based WRED to the interface. The thresholds limit the average queue 
length.

qos wfq, qos wred enable, display qos wred interface.

# Set lower threshold of the packet of precedence 3 at an interface to 20, the 
higher threshold to 40, and the discard probability to 15.

<Sysname> system-view

[Sysname] interface ethernet1/0

[Sysname-Ethernet1/0] qos wfq queue-length 100 queue-number 512

[Sysname-Ethernet1/0] qos wred ip-precedence enable

[Sysname-Ethernet1/0] qos wred ip-precedence 3 low-limit 20 high-lim

it 40 discard-probability 15 

qos wred weighting-constant exponent