Configures a weighted random early detection (WRED) profile which includes the setting of the thresholds and drop probability by percentage. The command also enables or disable Explicit Congestion Notification (ECN) feature.
Global configuration mode
You can configure a maximum on 256 profiles.
After configuring the profile, apply it to an interface with the qos random-detect traffic-class command.
Use the no form of this command to delete the profile.
Use the ecn {on | off} command to enable or disable Explicit Congestion Notification (ECN) for this device. ECN allows the routers and switches to signal the traffic end-points of the congestion without dropping any frames, and thus the end-points can adjust their transmission rates without the added latency and jitter that would have been introduced by dropped frames.
When a device detects a congestion, it is imperative that the device indicates to the other end-points about the congestion as soon as it is detected. Since a congestion in one direction need not imply a congestion in its opposite direction, this device has to indicate to the other end-point so that it, the other end-point, can take appropriate action.
ECN requires that Random Early Detection (RED) profiles are created using the red-profile command and applied to the interface. ECN is only available for Unicast frames.
The following example is a WRED configuration.
device# configure terminal
device(config)# qos red-profile 1 min-threshold 30 max-threshold 60 drop-probability 44 ecn on