Configuration Guide
QoS Configuration
enabled, the DSCP value of messages in the classified dataflow will remain unchanged,
and no message will be discarded before the message is sent for the Marking action.
Marking
After the Classifying and Policing actions, the Marking action will write the QoS
information for the message to ensure the DSCP value of the classified message can be
transferred to the next hop device in the network. Here, the QoS ACLs can be used to
change the QoS information of the message, or the QoS information is reserved in the
Trust mode. For example, the Trust DSCP can be selected to reserve the DSCP
information in the IP packet header.
Queuing
The Queuing action is responsible for transferring the messages in the dataflow to an
output queue of the port. The messages in different output queues will have transmission
service policies of different levels and qualities.
Each port has 8 output queues. The two mapping tables DSCP-to-CoS Map and
Cos-to-Queue Map configured on the switch convert the DSCP value of the message into
output queue number so as to determine which output queue to transfer the messages into.
Scheduling
The Scheduling action is the last cycle in the QoS process. After the messages are
transferring into different output queues of the port, the switch works with WRR or
another algorithm to transmit the messages in those 8 queues.
It is possible to set the weight in the WRR algorithm to configure the amount of messages
to be transmitted in every cycle of message output, thus affecting the transmission
bandwidth. Alternatively, it is possible to set the weight in the DRR algorithm to
configure the amount of message bytes to be transmitted in every cycle of message output,
thus affecting the transmission bandwidth.
QoS Configuration
Default QoS configuration
Make clear the following points of QoS before starting the configuration:
One interface can be associated with at most one policy-map.
One policy-map can have multiple class-maps.
One class-map can be associated at most one ACL, and all ACEs in that ACL must
have the same filter domain template.
Содержание RG-S2900G-E Series
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