Alcatel-Lucent 7210 SAS M Interface Configuration Manual page 146

Interface QoS Commands
In the "sap-based" mode the scheduler uses round-robin scheduling mechanism to schedule each of the
SAPs configured on a port. The scheduler considers the priority of all the egress queues in a SAP to
determine the next queue to be scheduled.
To use the SAP egress aggregate-rate-limit command the port scheduler mode must be set to 'sap-based'
using this command. For more information on the aggregate-rate-limit command, see 7210 SAS-X
Services guide.
Default fc-based
Page 140 7210 SAS M, T, X, R6, Mxp Interface Configuration Guide