Chapter 4 Configuring Driver Parameters 45
Random Early Drop ParametersTABLE4-8 describes the RX random early detection 8-bit vectors, which allows you to
enable random early drop (RED) thresholds. When received packets reachthe RED
range packets are dropped according to the presetprobability. The probability
should increase when the FIFO level increases. Control packets arenever dropped
and are not counted in the statistics.
TABLE4-8 RX Random Early Detecting 8-Bit Vectors
FieldName Values Description
red-dv4to6k 0 to 255 Random early detection and packet dropvectors for
whenFIFO threshold is greater than 4096 bytes and less
than 6,144 bytes. Probabilityof drop can be
programmedon a 12.5 percent granularity. For
example,if bit 0 is set the first packet out of every eight
will be droppedin this region.(Default=0)
red-dv6to8k 0 to 255 Random early detection and packet dropvectors for
when FIFO thresholdis greater than 6,144 bytes and
less than 8,192 bytes. Probabilityof drop can be
programmedon a 12.5 percent granularity. For
example,if bit 0 is set the first packet out of every eight
will be droppedin this region.(Default=0)
red-dv8to10k 0 to 255 Random early detection and packet dropvectors for
when FIFO thresholdis greater than 8,192 bytes and
less than 10,240 bytes. Probabilityof drop can be
programmedon a 12.5 percent granularity. For
example, if bit 1 and 6 areset the second and seventh
packets out of every eight will be droppedin this
region.(Default=0)
red-dv10to12k 0 to 255 Random early detection and packet dropvectors for
when FIFO thresholdis greater than 10,240 bytes and
less than 12,288 bytes. Probabilityof drop can be
programmedon a 12.5 percent granularity. If bit 2, 4
and 6 areset then the third, fifth and seventh packets
out of every eight will be droppedin this region.
(Default=0)