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Quality of Service
Mapping CoS/802. 1 p Priorities to Queues
STEP 3
STEP 4
STEP 5
Mapping CoS/802.1p Priorities to Queues
NOTE
STEP 1
STEP 2
STEP 3
STEP 4
Cisco Small Business SG200 Series 8-port Smart Switches Administration Guide
Select one of the following modes for each queue on the selected interface:
•
Strict Priority—Select to have the scheduler forward traffic strictly based
on the priority levels in the queues. The queue with the highest priority traffic
will have access to the egress port until all such traffic is forwarded. Strict
priority mode can be used to provide low-latency service to higher priority
classes of traffic.
•
WRR—Select to have the scheduler service the queue in turn with other
WRR queues, based on its bandwidth percentage relative to other WRR
queues. Strict queues continue to be serviced for the duration that they have
higher priority traffic.
If you select WRR mode for a queue, enter a bandwidth percentage in the
Percentage of WRR Bandwidth field. The total of all bandwidth percentages for all
queues cannot exceed 100%.
Click Apply. Your changes are saved to the Running Configuration.
To apply these queue properties to all other interfaces on the switch, click Copy
Settings to All Interfaces.
The priority of a packet arriving on an interface might be identified by an IEEE
802. 1 p priority value in the Ethernet frame header. 802. 1 p specifies eight priority
levels (0–7). Use the CoS/802. 1 p to Queue page to map these priority levels to the
four CoS queues to steer packets to the appropriate outbound queue. Queue1
has the lowest priority and queue 4 has the highest priority.
CoS/802. 1 p priority levels–to–queue mapping is configured per interface.
Configure these mapping values on the incoming interface.
To map 802. 1 p priority values to queues:
Click Quality of Service > CoS/802.1p to Queue in the navigation window.
Select the port or LAG to configure.
For each 802. 1 p Class of Service, select a queue from the Output Queue list.
Queue 1 has the lowest priority, and Queue 4 has the highest priority.
Click Apply. Your changes are saved to the Running Configuration.
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