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TRENDnet User’s Guide
Industrial Managed Switch Series
38
Round Robin scheduling services queues on a rotating basis and is activated only
when a port has more traffic than it can handle. A queue is given an amount of
bandwidth irrespective of the incoming traffic on that port. This queue then moves
to the back of the list. The next queue is given an equal amount of bandwidth, and
then moves to the end of the list; and so on, depending on the number of queues
being used. This works in a looping fashion until a queue is empty.
Weighted Round Robin (WRR) scheduling uses the same algorithm as round robin
scheduling, but services queues based on their priority and queue weight (the
number you configure in the queue Weight field) rather than a fixed amount of
bandwidth. WRR is activated only when a port has more traffic than it can handle.
Queues with larger weights get more service than queues with smaller weights. This
queuing mechanism is highly efficient in that it divides any available bandwidth
across the different traffic queues and returns to queues that have not yet emptied.
Default Settings
QoS mode : High First (SPQ)
The mappings of the Priority to Queue are:
PRIO 0 ==> COSQ 2
PRIO 1 ==> COSQ 0
PRIO 2 ==> COSQ 1
PRIO 3 ==> COSQ 3
PRIO 4 ==> COSQ 4
PRIO 5 ==> COSQ 5
PRIO 6 ==> COSQ 6
PRIO 7 ==> COSQ 7
The DiffServ is disabled on the switch.
DSCP Priority DSCP Priority DSCP Priority DSCP Priority
---- -------- ---- -------- ---- -------- ---- --------
00 0 01 0 02 0 03 0
04 0 05 0 06 0 07 0
08 0 09 0 10 0 11 0
12 0 13 0 14 0 15 0
16 0 17 0 18 0 19 0
20 0 21 0 22 0 23 0
24 0 25 0 26 0 27 0
28 0 29 0 30 0 31 0
32 0 33 0 34 0 35 0
36 0 37 0 38 0 39 0
40 0 41 0 42 0 43 0
44 0 45 0 46 0 47 0
48 0 49 0 50 0 51 0
52 0 53 0 54 0 55 0
56 0 57 0 58 0 59 0
60 0 61 0 62 0 63 0
Note: If the DiffServ is disabled, the 802.1p tag priority will be used.
CLI Configuration
Node Command Description
enable show queue cos-map This command displays the current 802.1p
priority mapping to the service queue.
enable show qos mode This command displays the current QoS
scheduling mode of IEEE 802.1p.
configure queue cos-map
PRIORITY QUEUE_ID This command configures the 802.1p priority
mapping to the service queue.
configure no queue cos-map This command configures the 802.1p priority
mapping to the service queue to default.
configure qos mode high-first This command configures the QoS scheduling
mode to high_first, each hardware queue will
transmit all of the packets in its buffer before
permitting the next lower priority to transmit