UMN:CLI User Manual
V5808
204
Specifies the 802.1p priority using dscp-to-cos mapping
table for incoming packets through a port.
no port trust dscp [PORTS]
Deletes a specified 802.1p priority.
To display the 802.1p priority the flow control information, use the following command.
show port trust dscp [PORTS]
Shows the 802.1p priority information
7.5.9.5 The Traffic of Queue
To display the traffic statistic information on each queue, use the following command.
show queue status PORTS [<0-
7>]
Shows the traffic statistic information on each queue.
7.5.9.6 Displaying QoS
To display the configuration of QoS, enter following command.
Shows the configuration of QoS for all ports.
Shows the configuration of QoS per each port.
Shows the configuration of QoS for CPU packets.
7.5.9.7 Random Early Detection (WRED)
The V5808 supports Weighted Random Early Detection (WRED) which can selectively
discard lower priority traffic when an interface gets congested. WRED provides
differentiated performance characteristics for different classes of service. It minimizes the
impact of dropping high priority traffic. WRED is based on the RED algorithm.
RED, which utilizes end-to-end flow-control of TCP, is a random packet dropping function
when traffic reaches the user-given threshold even before it reaches maximum buffer size.
If traffic amount reaches maximum buffer size, all packets can be dropped, which makes
packet loss. Therefore, in order to prevent packet loss or unstable traffic transmission,
user can restrict excessive traffic over buffer size by setting up a threshold. With RED
function, packet loss is reduced and stable packet transmission can be acquired.
One of the drawbacks to implement RED function is that it randomly drops a large
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