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7000 Series L3 Managed Switch Reference Manual for Software v2.0
9-26 CLI Commands: Differentiated Services
config diffserv policy randomdrop
This command changes the active queue depth management scheme from the default tail drop to
RED. The
<policyname> and <classname> are the names of an existing DiffServ policy and
class, respectively. The first two data parameters are the average queue depth minimum and
maximum threshold values specified in bytes. The minimum threshold is an integer from 1 to
250000. The maximum threshold is an integer from 1 to 500000, but it must be equal to or greater
than the minimum threshold. The third data parameter is the maximum drop probability and is an
integer from 0 to 100. It indicates the percentage likelihood that a packet will be dropped when the
average queue depth reaches the maximum threshold value.
The remaining parameters are all optional. The fourth data parameter is the sampling rate,
indicating the period at which the queue is sampled for computing the average depth. Expressed in
microseconds, the sampling rate is an integer from 0 to 1000000, with a default of 0 (meaning per-
packet sampling). The last parameter is the decay exponent, which determines how quickly the
average queue length calculation decays over time, with a higher number producing a faster rate of
decay. This value is an integer from 0 to 16, with a default of 9.
Note: The last two parameters, namely sampling rate and decay exponent, are hierarchically
specified in this command. That is, in order to provide a value for the decay exponent <0-16>, the
user is required to also specify a sampling rate
<0-1000000> for proper command interpretation.
Format config diffserv policy randomdrop <policyname>
<classname> <1-250000> <1-500000> <0-100> [<0-
1000000> [<0-16>]]
Policy Type
Out
config diffserv policy shape average
This command is used to establish average rate traffic shaping for the specified class, which limits
transmissions for the class to the committed information rate, with excess traffic delayed via
queueing. The
<policyname> and <classname> are the names of an existing DiffServ policy and
class, respectively. The committed information rate is specified in kilobits-per-second (Kbps) and
is an integer from 1 to 4294967295.
Note: Queue depth management defaults to tail drop, but the config diffserv policy randomdrop
command can be used to change to a RED scheme.
Format config diffserv policy shape average <policyname>
<classname> <1-4294967295>