For an overview of buffer pools supported on the 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C, see Buffer pools.
On the 7210 SAS-K 2F1C2T, slope policies are applied to service ingress queues, service egress queues, access-uplink port ingress queues, and access-uplink port egress queues.
On the 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C, slope policies are applied to service ingress and egress queues; network port ingress and egress queues; hybrid port ingress and egress queues; and access-uplink port ingress and egress queues.
Each of these queuing points allocates buffers from the buffer pool and implements WRED for congestion management. During congestion WRED is used to evaluate how buffers from the pool are allocated to different FCs and to in-profile and out-of-profile traffic within a specific FC. The slope policies define the WRED parameters to use for in-profile/high-priority packets and for out-of-profile/low-priority packets. The high-slope and low-slope define the parameters for in-profile/high-priority packets and for out-of-profile/low-priority packets respectively. In addition, on ring ports the option is available to use separate slopes for ring traffic (that is, traffic coming in on one ring port and going out of another ring port) and non-ring traffic (that is, traffic coming in on access port and going out of another access port or access-uplink port). For more information about ring and non-ring ports, see Buffer pools.