Extreme Networks EAS 100-24t Switch CLI Manual
213
CHAPTER
7
Quality of Service (QoS)
QoS Commands
The switch supports 802.1p priority queuing. The switch has four priority queues. These priority queues
are numbered from 3 (Class 3) — the highest priority queue — to 0 (Class 0) — the lowest priority
queue. The eight priority tags specified in IEEE 802.1p (p0 to p7) are mapped to the switch’s priority
queues as follows:
● Priority 0 is assigned to the switch’s Q1 queue.
● Priority 1 is assigned to the switch’s Q0 queue.
● Priority 2 is assigned to the switch’s Q0 queue.
● Priority 3 is assigned to the switch’s Q1 queue.
● Priority 4 is assigned to the switch’s Q2 queue.
● Priority 5 is assigned to the switch’s Q2 queue.
● Priority 6 is assigned to the switch’s Q3 queue.
● Priority 7 is assigned to the switch’s Q3 queue.
Priority scheduling is implemented by the priority queues stated above. The switch will empty the four
hardware priority queues in order, beginning with the highest priority queue, 3, to the lowest priority
queue, 0. Each hardware queue will transmit all of the packets in its buffer before permitting the next
lower priority to transmit its packets. When the lowest hardware priority queue has finished
transmitting all of its packets, the highest hardware priority queue will begin transmitting any packets it
may have received.
The QoS commands in the CLI are listed (along with the appropriate parameters) in the following table:
Command Parameters
config bandwidth_control <portlist> {rx_rate [no_limit | <value 64-1024000>] | tx_rate [no_limit | <value
64-1024000>]}
show bandwidth_control {<portlist>}
config scheduling <class_id 0-3> weight <value 1-55>
config scheduling_mechanism [strict | weight_fair]
show scheduling
show scheduling_mechanism
config 802.1p user_priority <priority 0-7> <class_id 0-3>
show 802.1p user_priority
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