
Quality of Service (QoS)
©2008 Allied Telesis Inc. All rights reserved.
39.20
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
Software Version 5.2.1
Configuring the Egress Queues
Previous sections have explained the ingress functions. These include, how the incoming data
can be classified and marked according to its priority and allocated to an egress queue, then
finally how metering and remarking is applied. At this point the data then flows across the
switch to its destination egress port where its transit to the egress queues is controlled.
The means by which data is applied to the egress queues is dependant on three functions:
■
Egress queue and QoS markers that are set within each data packet
■
Egress controls that are applied to the whole switch
■
Egress that are applied to each individual switch port
Input Queues - The Internal Paths
Although the internal hardware functions of the switch are outside the scope of this manual,
the section,
“QoS and the Switching Fabric” on page 39.34
provides some background
information to help you understand and use the
mls qos input-queue
and
mls qos map input-
queue
commands. Basically, the internal path that links the fabric adaptors terminates in four
input queues. These queues schedule the data between the internal fabric adaptors and each
port’s egress queue.
The
mls qos input-queue
command, mentioned above, enables you to select the scheduling
algorithm to be either strict priority, or weighted round robin (WRR). Use the
show mls qos
input-queue
to see the present settings on your switch.
The
mls qos map input-queue
command enables you to map the egress queues to 4 internal
processor input queues. The commands section provides more information such as their
default settings and how to reconfigure them. Use the
show mls qos maps input-queue
to see
the present settings on your switch.
Egress Queues and QoS markers
Once the data packets have been appropriately filtered, classified, policed, and remarked, they
travel across the switch’s internal paths carrying their assigned QoS tag markers such as their
priority, class and destination queues. For more details on ingress data marking, refer to the
earlier sections of this chapter. At the egress port these markers are read and used to
determine which queues each data packet will be forwarded to, and the priorities that will be
applied.
There are eight egress queues allocated to each egress port. The egress queue that a particular
packet passes through is determined by either the configuration of the switch, or the markers
contained within the packet itself.
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