Quality of Service
General
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
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•
Default CoS
—Default VPT value for incoming packets that do not have a
VLAN Tag. The default CoS is 0. The default is only relevant for untagged
frames and only if the system is in Basic mode and Trust CoS is selected in
the
page.
Select
Restore Defaults
to restore the factory CoS default setting for this
interface.
To set QoS on an interface, select it, and click
Edit
.
STEP 1
Enter the parameters.
•
Interface
—Select the port or LAG.
•
Default CoS
—Select the default CoS (Class-of-Service) value to be
assigned for incoming packets (that do not have a VLAN tag).
STEP 2
Click
Apply
. The interface default CoS value is saved to Running Configuration file.
Queue
The number of queues supported is as follows:
•
The 350 device supports 4 queues for each interface. Queue number four is
the highest priority queue. Queue number one is the lowest priority queue.
•
The 550 device supports 8 queues for each interface. Queue number eight
is the highest priority queue. Queue number one is the lowest priority
queue.
There are two ways of determining how traffic in queues is handled, Strict Priority
and Weighted Round Robin (WRR).
•
Strict Priority
—Egress traffic from the highest-priority queue is
transmitted first. Traffic from the lower queues is processed only after the
highest queue has been transmitted, thus providing the highest level of
priority of traffic to the highest numbered queue.
•
Weighted Round Robin (WRR)
—In WRR mode the number of packets sent
from the queue is proportional to the weight of the queue (the higher the
weight the more frames are sent). For example, if there are a maximum of
four queues possible and all four queues are WRR and the default weights
