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The Switch supports 802.1p priority queuing. The Switch has 8 priority queues. These priority queues are numbered from 7 (Class
7) — 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.
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Priority 6 is assigned to the Switch's Q6 queue.
•
Priority 7 is assigned to the Switch's Q7 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, 7, 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 mapping of DSCP to COS will be used to determine the priority of the packet (which will be then used to determine the
scheduling queue) when the Switch is in DSCP trust state.
The commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the following table.
Command
config scheduling
config scheduling_mechanism
show scheduling
show scheduling_mechanism
config 802.1p user_priority
show 802.1p user_priority
config 802.1p default_priority
show 802.1p default_priority
config dscp trust
show dscp trust
config dscp map
show dscp map
Each command is listed, in detail, in the following sections.
DAS-3600 Series Ethernet over VDSL Switch CLI Reference Manual
Parameters
<class_id 0-7> weight <value 1-255>
[strict | wrr]
<priority 0-7> <class_id 0-7>
[<portlist> | all] <priority 0-7>
{<portlist>}
state [enable|disable]
dscp_priority <dscp > to <priority 0-7>
dscp_priotity
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OMMANDS
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