Overview of Buffer pools and Slope policies on 7210 SAS-K
Page 4 7210 SAS D, E, K OS Quality of Service Guide
Overview of Buffer pools and Slope policies on 7210 SAS-
K
For an overview of buffer pools supported on 7210 SAS-K, see Buffer Pools on page 60.
Slope policies are applied to service ingress queues, service egress queues, access uplink port
ingress and access uplink port 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 given 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 access-uplink port egress, option is available to use separate
slopes for ring traffic (that is, traffic coming in on one access-uplink port and going out of another
access-uplink port, it is assumed access-uplink ports are used as ring ports for connecting the node
to a ring) and non-ring traffic (that is, traffic coming in on access port and going out of another
access port or access-uplink port).
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