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Default Drop Profile
By default, if you configure no drop profiles, RED is still in effect and functions as the primary mechanism for managing congestion. In the default RED drop profile, when the fill-level is 0 percent, the drop probability is 0 percent. When the fill-level is 100 percent, the drop probability is 100 percent.
As a backup method for managing congestion, tail dropping takes effect when congestion of small packets occurs. On Juniper Networks M320 Multiservice Edge Routers and T Series Core Routers, the software supports tail-RED, which means that when tail dropping occurs, the software uses RED to execute intelligent tail drops. On other routers, the software executes tail drops unconditionally.
