Slope QoS Policies
356
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
7.1 Overview
Random Early Detection (RED) and Weighted Random Early Detection (WRED)
queue management policies are associated with queues and can be created at both
access and network ports and in both directions (that is, ingress and egress). The
main difference is that with WRED, there can be more than one slope curve
managing the fill rate of the same queue. One curve manages the discards on high-
priority traffic, and another curve manages the discards on low-priority traffic. For
more information, refer to Slope Policies (WRED and RED).
On all adapter cards and platforms except the Gen-3 Ethernet adapter cards and
platforms (such as the 6-port Ethernet 10Gbps Adapter card and the 7705 SAR-X
with Ethernet ports), random discards (WRED) are buffer-based (that is, buffer-count
in the queue is used to calculate the discard threshold). On the Gen-3 Ethernet
adapter cards and platforms, random discards are byte-based (that is, payload-count
(bytes) in the queue is used to calculate the discard threshold). The 7705 SAR-X with
a TDM MDA uses buffer-based WRED.
For information about the tasks and commands necessary to access the command
line interface and to configure and maintain the 7705 SAR, refer to the
7705 SAR Basic System Configuration Guide, “CLI Usage”.
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