A Controlled-Load Scheme
A connection has to specify its Tspec in terms of token bucket rate and depth
If there aren’t enough tokens present at the time of transmission, the packet is treated as non-conformant
Non-conformant and best-effort traffic injected into network unmarked
Conformant traffic is marked
At routers, an enhanced RED (ERED) FIFO is used
Marked packets have a lower drop probability
Admission control ensures sum of rates does not exceed link capacity
Designed for TCP based applications (assumes TCP-reno)