H3C Technologies H3C Intelligent Management Center - Manual (Page 67)

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Action Description
Queuing and WRED
To display the detail configuration window, you must specify the queuing
type and bandwidth value before clicking the Config link.
Base Configuration:
• Queuing Type—Select a queuing type. Options are EF, AF, and WFQ.
• Bandwidth Value—Specify the bandwidth value in kbps (value range
is 8 to 1000000) or as a percentage (value range is 1 to 100) of
available bandwidth. This parameter takes effect only on EF and AF.
Advance Configuration:
When the queuing type is EF, configure the following parameters:
• Queue CBS(byte)—Specify the committed burst size. This parameter
needs to be configured only if you have specified the bandwidth value
in kbps.
• Queue CBS-Ratio—Specify the CBS factor value in the range of 25 to
500. The CBS is the CBS factor multiplied by the bandwidth value.
When the queuing type is AF, configure the following parameters:
• Drop Type—Specify the packet drop mechanism. Options are Tail
Drop and WRED.
• Max Queue Length—Specify the maximum number of packets that can
be held in a queue, in the range of 1 to 512. This parameter needs to
be configured only if have you specified tail drop as the packet drop
mechanism.
• WRED Type—Specify the WRED type. Options are DSCP and IP
Precedence. DSCP indicates that WRED uses the DSCP value to
calculate the packet drop probability. IP Precedence indicates that
WRED uses the IP precedence value to calculate the packet drop
probability. This parameter needs to be configured only if you have
specified WRED as the packet drop mechanism.
• Configure WRED parameters for each queue:
{
Click Add.
{
Enter a priority value in the Value field. The value range is 0 to 7 for
IP precedence and 0 to 63 for DSCP.
{
Specify the upper limit for packet drop in the High Limit field. When
the average queue length is above this limit, all arriving packets are
dropped.
{
Specify the lower limit for packet drop in the Low Limit field. When
the average queue length is at or above this limit, arriving packets
are randomly dropped based on the drop probability.
{
Specify the denominator used in drop probability calculation in the
Drop probability denominator field.
{
Repeat the preceding steps to configure WRED parameters for other
queues.
When the queuing type is WFQ, the parameters that need to be
configured are similar to those for AF. Configure the only different
parameter:
• Queue Number—Specify the number of queues, in the range of 16 to
4096. The value must be a power of 2.