The 7210 SAS-R6 IMM-c and 7210 SAS-R12 IMM-c do not support the user configuration of CBS and MBS queue parameters. These values are system-defined and configured values in queue management policies are ignored. On the 7210 SAS-R6 IMM-c and 7210 SAS-R12 IMM-c, only the WRED slope parameters are used from the queue management policy. References to allocation of queue buffers in this section applies only to the 7210 SAS-R6 IMM-b, 7210 SAS-R12 IMM-b, and 7210 SAS-Mxp.
Queue management policies allows the user to define the queue buffer and WRED slope parameters. The device supports a single buffer pool per node. All the queues created in the system are allocated buffers from this system pool. The default buffers are allocated to the queues accordingly when they are associated with a SAP or a network port.
Queue management policies allow the user to define the CBS, MBS and WRED parameters for use by the queue. The CBS and MBS parameters are used to allocate the appropriate amount of buffers from the system pool to the queues. The WRED parameters allow the user to define the WRED slope characteristics.
You can define a high-slope and a low-slope for each of the queues. High-slope is used for in-profile packets being enqueued into the queues and low-priority slope is used for out-of-profile packets being enqueued into the queues. By default each queue is associated with a default queue-management policy. The default policy allocates the appropriate amount of CBS and MBS buffers based on whether the queue is associated with a SAP or network port.
If WRED is not configured, taildrop is used.