67
6.1.1.4
Schedule Mode
Queuing Algorithms
Queuing algorithms allow switches to maintain separate queues for packets from each individual
source or flow and prevent a source from monopolizing the bandwidth.
Strict-Priority (SPQ)
The packets on the high priority queue are always service firstly.
Weighted round robin (WRR)
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.
6.1.1.4.1
CLI Configuration
Node
Command
Description
enable
show qos mode
This command displays the current QoS scheduling
mode of IEEE 802.1p.
enable
configure terminal
This command changes the node to configure node.
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 its packets.
configure qos mode wrr-queue
weights <1-127> <1-
127> <1-127> <1-
127> <1-127> <1-
127> <1-127> <1-
127>
This command configures the QoS scheduling mode to
Weighted Round Robin.
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