Congestion avoidance
The purpose of congestion avoidance is to identify the onset of congestion early enough and
start dropping packets to avoid complete depletion of resources. RED monitors queue
congestion
and discards packets before they are admitted to the queue. The WRED algorithm
is an extension to RED in the sense that it also incorporates the packet’s conformance level
(DP) into consideration, so that traffic with high DP is dropped first. Two packet dropping
mechanisms namely the tail-drop and random-detect are supported
The show qos module congestion-profile command shows the WRED configuration
for each outgoing queue and for each drop precedence value. There are 4 congestion profiles
supported and one of these 4 profiles can be attached to an egress interface.
Module QoS troubleshooting
Troubleshooting August 2013 269
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