Alcatel 9000 Betriebsanweisung PDF herunterladen (Seite 527)

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Configuring QoS QoS Ports and Queues

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 26-21

• The higher the queue weight assigned to a DRR queue, the higher the percentage of traffic that is

serviced by that queue. For example, a queue with a weight of three will send four times as much traf-

fic as a queue with a weight of one.

The queuing scheme selected is the scheme that is used to shape traffic on destination (egress) ports and is

referred to as the QoS servicing mode for the port. It is possible to configure a default servicing mode that

will apply to all switch ports (see “Setting the Global Default Servicing Mode” on page 26-14) or config-

ure the servicing mode on an individual port basis (see “Configuring the Servicing Mode for a Port” on

page 26-21).

Note that the QoS servicing mode only applies to destination ports because it is at this point where traffic

shaping is effected on the flows. In addition, different ports can use different servicing modes.

Configuring the Servicing Mode for a Port

The qos port servicing mode command is used to configure the queuing scheme for an individual port.

For example, the following command selects the strict priority scheme for port 1/2:

-> qos port 1/2 servicing mode strict-priority

The following command selects the WRR scheme for port 1/8:

-> qos port 1/8 servicing mode wrr

In the above example, a weight for each of the eight WRR queues was not specified; therefore, the default

value of 1 is used for each queue. The following example selects the WRR scheme for port 1/10 and

assigns a weighted value to each queue:

-> qos port 1/10 servicing mode wrr 0 2 3 4 8 1 1 7

To reset the servicing mode for the port back to the global default mode, use the default parameter with

this command and do not specify a queueing scheme. For example,

-> qos port 1/10 servicing mode default

The qos default servicing mode command is used to set the global default queuing scheme that is used

for all ports. See “Setting the Global Default Servicing Mode” on page 26-14 for more information.

Note the following when configuring the port servicing mode:

• The qos port servicing mode command overrides the default servicing mode configured with the qos

default servicing mode command.

• Once the qos port servicing mode command is used on a port, this same command is required to make

any additional mode changes for that port. If the port is changed back to the default servicing mode,

however, this restriction is removed and the qos default servicing mode command is also allowed on

the port.

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