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”.