Config Red - Extreme Networks ExtremeWare Command Reference Manual

PoS Commands

config red

config red [drop-probability | low-drop-probability |
high-drop-probability] <percent> {ports <portlist>}
Description
Configures the RED drop probability for a specified port.
Syntax Description
drop-probability
low-drop-probability
high-drop-probability
percent
portlist
Default
For PoS ports, both the low and high drop-probabilities default to 10%.
Usage Guidelines
The optional
low-drop-probability
to support the PoS module. Currently, these new keywords are only supported for SONET ports.
Omission of the keyword indicates that the setting is to be applied to all ports.
ports
The drop probability is specified as a percentage, where the
range [1..100]. The implementation provides weighted RED (WRED) functionality via support for two
different drop probabilities: a
packets indicate whether the packet should be dropped with low probability or high probability, and
the appropriate percentage is then applied if WRED is active. WRED is only applied to IP packets, and
the
config diffserv examination code-point
DSCPs to the two different drop-probability levels. The configured mapping of DSCPs to
drop-probability levels is used by WRED even if
The
drop-probability
low and high drop-probabilities, which effectively disables WRED and reverts to standard RED
operation. RED is active when the average queue length is between the minimum and maximum
thresholds. In this region, the probability that a given packet is dropped increases linearly up to the
configured drop probability at the maximum threshold. All packets are dropped when the average
queue length exceeds the maximum threshold.
Example
The following command configure a RED high drop-probability of 20% on the SONET ports:
config red high-drop-probability 20 ports 2:1-2:2
1288
Specifies both the high and low drop probability rates.
Sets the low drop probability rate.
Sets the high drop probability rate.
Specifies the percentage for the drop probability.
Specifies the port number(s).
,
high-drop-probability
low-drop-probability
keyword indicates that the specified percentage should be used for both the
, and
ports
parameter is an integer in the
percent
and a
high-drop-probability
command supports complete flexibility in assigning
diffserv examination
keywords have been added
. The DSCPs of IP
is disabled on the port.
ExtremeWare Software 7.0.0 Command Reference Guide