
Quality of Service (QoS)
©2008 Allied Telesis Inc. All rights reserved.
39.34
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
Software Version 5.2.1
QoS and the Switching Fabric
Ports on the x900 series switches belong to one of four switch processor instances: two on the
base board and one on each expansion module. Switch instances exchange packets over a
switching fabric. The switching fabric recognizes the priorities assigned to each packet and
performs QoS queuing.
The switching fabric is different from the switch processor instance in that the switching fabric
has four queues, whereas each switch port in a switch processor instance has eight egress
queues. These two types of queues must be mapped to each other.
To specify the mapping of the 8 switch processor port queues to the 4 fabric queues, use the
command:
mls qos map input-queue command on page 40.24
.
The integers
q0
to
q7
indicate the fabric queue that corresponds to an egress queue.
You can also configure the switching fabric to use different scheduling methods for each of the
four fabric queues. This controls the way that fabric queues share the available bandwidth
during congested times. See the
mls qos input-queue command on page 40.21
.
To display information about settings for the switching fabric, use the command:
show mls qos maps input-queue command on page 40.58
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