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xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
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13
QOS COMMANDS
The xStack DGS-3600 Series supports 802.1p priority queuing. The Switch has seven configurable priority queues. These priority
queues are numbered from 6 (Class 6) — 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 Q2 queue.
• Priority 1 is assigned to the Switch’s Q0 queue.
• Priority 2 is assigned to the Switch’s Q1 queue.
• Priority 3 is assigned to the Switch’s Q3 queue.
• Priority 4 is assigned to the Switch’s Q4 queue.
• Priority 5 is assigned to the Switch’s Q5 queue.
• Priority 6 is assigned to the Switch’s Q6 queue.
• Priority 7 is assigned to the Switch’s Q6 queue.
Priority scheduling is implemented by the priority queues stated above. The Switch will empty the eight hardware priority queues in
order, beginning with the highest priority queue, 6, 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.
NOTICE: The Switch contains eight classes of service for each port on the Switch. One of these
classes is reserved for internal use on the Switch and therefore is not configurable. All references in
the following section regarding classes of service will refer to only the seven classes of service that
may be used and configured by the Switch’s Administrator.
The commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the following table.
Command Parameters
config bandwidth_control [<portlist> | all] {rx_rate [no_limit | <value 1-156249>] |
tx_rate [no_limit | <value 1-156249>]}
show bandwidth_control {<portlist>}
config scheduling <class_id 0-6> {max_packet <value 0-15>}
show scheduling
config 802.1p user_priority <priority 0-7> <class_id 0-6>
show 802.1p user_priority
config 802.1p default_priority [<portlist> | all] <priority 0-7>
show 802.1p default_priority {<portlist>}
config scheduling_mechanism [strict | weight_fair]
show scheduling_mechanism
enable hol_prevention
disable hol_prevention
show hol_prevention
Each command is listed, in detail, in the following sections.