Sun Microsystems X1150A Random Early Drop Parameters, 8RX Random Early Detecting 8-Bit Vectors

Random Early Drop Parameters

TABLE 4-8describes the RX random early detection 8-bit vectors, which allows you to enable random early drop (RED) thresholds. When received packets reach the RED range packets are dropped according to the preset probability. The probability should increase when the FIFO level increases. Control packets are never dropped and are not counted in the statistics.

TABLE 4-8RX Random Early Detecting 8-Bit Vectors

Field Name	Values	Description
red-dv4to6k	0 to 255	Random early detection and packet drop vectors for
		when FIFO threshold is greater than 4096 bytes and less
		than 6,144 bytes. Probability of drop can be
		programmed on a 12.5 percent granularity. For
		example, if bit 0 is set the first packet out of every eight
		will be dropped in this region. (Default=0)
red-dv6to8k	0 to 255	Random early detection and packet drop vectors for
		when FIFO threshold is greater than 6,144 bytes and
		less than 8,192 bytes. Probability of drop can be
		programmed on a 12.5 percent granularity. For
		example, if bit 0 is set the first packet out of every eight
		will be dropped in this region. (Default=0)
red-dv8to10k	0 to 255	Random early detection and packet drop vectors for
		when FIFO threshold is greater than 8,192 bytes and
		less than 10,240 bytes. Probability of drop can be
		programmed on a 12.5 percent granularity. For
		example, if bit 1 and 6 are set the second and seventh
		packets out of every eight will be dropped in this
		region. (Default=0)
red-dv10to12k	0 to 255	Random early detection and packet drop vectors for
		when FIFO threshold is greater than 10,240 bytes and
		less than 12,288 bytes. Probability of drop can be

programmed on a 12.5 percent granularity. If bit 2, 4 and 6 are set then the third, fifth and seventh packets out of every eight will be dropped in this region.

(Default=0)

Chapter 4 Configuring Driver Parameters 45