Dell S6000 FTOS 9.0(2.0) Command Line Reference Guide for the System - Page 764

www.dell.com | support.dell.com Related Commands wred-profile trust Create a WRED profile and name that profile Define the dynamic classification to trust DSCP wred ecn z S6000 Use Explicit Congestion Notification (ECN) to indicate network congestion, rather than dropping packets. Syntax wred ecn Use the no wred ecn command to stop marking packets. Defaults No default behavior or values Command Modes CONFIGURATION (conf-qos-policy-out) Command History Version 9.0.2.0 Version 8.3.11.1 Version 8.3.7.0 Introduced on the S6000. Introduced on Z9000 Introduced on the S4810. Usage When wred-ecn is enabled, and the number of packets in the queue is below the minimum threshold, Information packets are transmitted per the usual WRED treatment. When wred-ecn is enabled, and the number of packets in the queue is between the minimum threshold and the maximum threshold, one of the following three scenarios can occur: • If the transmission endpoints are ECN capable and traffic is congested, and the WRED algorithm determines that the packet should have been dropped based on the drop probability, the packet is transmitted and marked so the routers know the system is congested and can slow transmission rates. • If neither endpoint is ECN capable, the packet may be dropped based on the WRED drop probability. This is the identical treatment that a packet receives when WRED is enabled without ECN configured on the router. • If the packet is CE marked, the packet is transmitted. No further marking is required. When wred-ecn is enabled, and the number of packets in the queue is above the maximum threshold, packets are dropped based on the drop probability. This is the identical treatment a packet receives when WRED is enabled without ECN configured on the router. Related Commands wred-profile Create a WRED profile and name that profile wred-profile z S6000 Create a WRED profile and name that profile. Syntax wred-profile wred-profile-name 764 | Quality of Service (QoS)