Mls Qos Trust - D-Link DXS-3600 Series Cli Reference Manual

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
subtracted from the corresponding credit counter and the service right is turned over to the next lower
CoS queue. When the credit counter drops below 0, the queue is no longer serviced until its credits are
replenished. When the credit counters of all CoS queues reaches 0, the credit counters will be
replenished at that time.
All packets are serviced until their credit counter is zero or negative and the last packet is transmitted
completely. When this condition happens, the credits are replenished. When the credits are replenished,
a quantum of credits are added to each CoS queue credit counter. The quantum for each CoS queue
may be different based on the user configuration.
To set a CoS queue in the strict priority mode, any higher priority CoS queue must also be in the strict
priority mode.
WRR operates by transmitting permitted packets into the transmit queue in a round robin order. Initially,
each queue sets its weight to a configurable weighting. Every time a packet from a higher priority CoS
queue is sent, the corresponding weight is subtracted by 1, and the packet in the next lower CoS queue
will be serviced. When the weight of a CoS queue reaches zero, the queue will not be serviced until its
weight is replenished. When weights of all CoS queues reach 0, the weights get replenished at a time.
Example
This example shows how to configure the queue scheduling algorithm to the strict priority mode.
Switch# configure terminal
Switch(config)# interface ethernet 1/0/1
Switch(config-if)# mls qos scheduler sp
Switch(config-if)#
87-12

mls qos trust

This command is used to configure the trust state of a port to trust either the CoS field or the DSCP field
of the arriving packet for subsequent QoS operation. Use the no form of the command to revert to the
default setting.
mls qos trust {cos | dscp}
no mls qos trust
Parameters
cos
dscp
Default
By default, CoS is trusted.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
Specifies that the CoS bits of the arriving packets are trusted for
subsequent QoS operations.
Specifies that the ToS/DSCP bits, if available in the arriving packets,
are trusted for subsequent operations. For non-IP packet, Layer 2 CoS
information will be trusted for traffic classification.
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