SMC Networks 6709FL2 INT - FICHE TECHNIQUE, Management Manual

Page: 30 / 142

C
ONFIGURING THE
S
WITCH
3-8
Class of Service Configuration
Class of Service (CoS) allows you to specify which data packets have
greater precedence when traffic is buffered in the switch due to
congestion. This switch supports CoS with two priority queues for each
port. Data packets in a port’s high-priority queue are transmitted before
those in the lower-priority queue.
You can set the method used to process priority traffic (i.e., first-in
first-out, all high before low, or weighted round-robin), and also map the
frame priority tags (i.e., 0 - 7) to the high or low priority queues.
Field Attributes
•
First Come First Served
– Packets are processed first-in first-out.
•
All High before Low
– All packets in the high-priority queue are
processed before any packets in the low-priority queue.
•
Weighted Round Robin
– Sets the preference given to packets in the
high-priority queue. This specifies the number of high-priority packets
sent before one low-priority packet is sent. (Range: 1-7; Default: 2)
•
Enable Delay Bound
– Limits the queuing time for low-priority
packets. Any low-priority packets that exceed the delay bound will be
sent. Note that the “Max bridge transmit delay bound control” must be
enabled (page 3-6) for the Enable Delay Bound to function.
(Range: 0-255 ms; Default: 0 ms)
•
QoS Policy
(High Priority Levels) – The default priority levels are
assigned according to recommendations in the IEEE 802.1p standard.
However, you can map the priority levels to the switch’s output queues
in any way that benefits application traffic for your own network.
(Range: Level 0 - 7; Default: Level 4 - 7)
Web
– Click Administrator=>Switch Settings=>Advanced. Select the
priority method (First Come First Serve, All High before Low, or WRR),
set the high-priority queue weight preference when using WRR, set a delay