Lenovo Flex System Fabric CN4093 Application Manual page 216

216
CN4093 Application Guide for N/OS 8.4
The CN4093 can classify traffic by reading the DiffServ Code Point (DSCP) or IEEE
802.1p priority value, or by using filters to match specific criteria. When network
traffic attributes match those specified in a traffic pattern, the policy instructs the
CN4093 to perform specified actions on each packet that passes through it. The
packets are assigned to different Class of Service (COS) queues and scheduled for
transmission.
The basic CN4093 QoS model works as follows:
 Classify traffic:
Read DSCP

Read 802.1p Priority

Match ACL filter parameters

 Meter traffic:
Define bandwidth and burst parameters

Select actions to perform on in‐profile and out‐of‐profile traffic

Perform actions:

Drop packets

Pass packets

Mark DSCP or 802.1p Priority

Set COS queue (with or without re‐marking)

Queue and schedule traffic:

Place packets in one of the available COS queues

Schedule transmission based on the COS queue weight
