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QOS COMMANDS
The DES-3550 switch supports 802.1p priority queuing. The switch has 4 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, 4, 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 commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the following table.
Command Parameters
config
bandwidth_control
[<portlist>] {rx_rate [no_limit | <value 1-1000>] | tx_rate
[no_limit<value 1-1000>]}
show bandwidth_control <portlist>
config scheduling <class_id 0-3> {max_packet <value 0-255> | max_latency
<value 0-255>}
show scheduling
config 802.1p
user_priority
<priority 0-7>
<class_id 0-3>
show 802.1p
user_priority
config 802.1p
default_priority
[<portlist> |all ] <priority 0-7>
show 802.1p
default_priority
<portlist>
Each command is listed, in detail, in the following sections.
config bandwidth_control
Purpose Used to configure bandwidth control on a by-port basis.
Syntax
config bandwidth_control [<portlist>] {rx_rate [no_limit | <value
1-1000>] | tx_rate [no_limit <value 1-1000>]}
Description
The
config bandwidth_control
command is used to configure
bandwidth on a by
port basis