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<P>
Configuration Parameters are:
<DL>
<DT><STRONG>okborrow_</STRONG></DT>
<DD>is a boolean indicating the class is permitted to borrow
bandwidth from its parent. 

<P>
</DD>
<DT><STRONG>allot_</STRONG></DT>
<DD>is the maximum fraction of link bandwidth allocated to the
class expressed as a real number between 0.0 and 1.0. 

<P>
</DD>
<DT><STRONG>maxidle_</STRONG></DT>
<DD>is the maximum amount of time a class may be required to
have its packets queued before they are permitted to be forwarded 

<P>
</DD>
<DT><STRONG>priority_</STRONG></DT>
<DD>is the class' priority level with respect to other classes. This value may
range from 0 to 10, and more than one class may exist at the same
priority. Priority 0 is the highest priority. 

<P>
</DD>
<DT><STRONG>level_</STRONG></DT>
<DD>is the level of this class in the link-sharing tree. Leaf nodes in the
tree are considered to be at level 1; their parents are at level 2, etc. 

<P>
</DD>
<DT><STRONG>extradelay_</STRONG></DT>
<DD>increase the delay experienced by a delayed class by the specified time 
</DD>
</DL>

<P>
Q<SMALL>UEUE-MONITOR OBJECTS</SMALL>
<BR>
QueueMonitor Objects are used to monitor a set of packet and byte arrival,
departure and drop counters. It also includes support for aggregate
statistics such as average queue size, etc.

<P>
<TT>$queuemonitor</TT>
<BR>
reset all the cumulative counters described below (arrivals, departures,
and drops) to zero. Also, reset the integrators and delay sampler, if
defined. 

<P>
<TT>$queuemonitor set-delay-samples delaySamp_</TT>
<BR>
Set up the Samples object delaySamp_ to record statistics about queue
delays. delaySamp_ is a handle to a Samples object i.e the Samples object
should have already been created. 

<P>
<TT>$queuemonitor get-bytes-integrator</TT>
<BR>
Returns an Integrator object that can be used to find the integral of the
queue size in bytes. 

<P>
<TT>$queuemonitor get-pkts-integrator</TT>
<BR>
Returns an Integrator object that can be used to find the integral of the
queue size in packets.

<P>
<TT>$queuemonitor get-delay-samples</TT>
<BR>
Returns a Samples object delaySamp_ to record statistics about queue
delays.

<BR>
There are no configuration parameters specific to this object. 

<BR>
State Variables are:
<DL>
<DT><STRONG>size_</STRONG></DT>
<DD>Instantaneous queue size in bytes. 

<P>
</DD>
<DT><STRONG>pkts_</STRONG></DT>
<DD>Instantaneous queue size in packets. 

<P>
</DD>
<DT><STRONG>parrivals_</STRONG></DT>
<DD>Running total of packets that have arrived. 

<P>
</DD>
<DT><STRONG>barrivals_</STRONG></DT>
<DD>Running total of bytes contained in packets that have
arrived. 

<P>
</DD>
<DT><STRONG>pdepartures_</STRONG></DT>
<DD>Running total of packets that have departed (not
dropped). 

<P>
</DD>
<DT><STRONG>bdepartures_</STRONG></DT>
<DD>Running total of bytes contained in packets that have
departed (not dropped). 

<P>
</DD>
<DT><STRONG>pdrops_</STRONG></DT>
<DD>Total number of packets dropped. 

<P>
</DD>
<DT><STRONG>bdrops_</STRONG></DT>
<DD>Total number of bytes dropped. 

<P>
</DD>
<DT><STRONG>bytesInt_</STRONG></DT>
<DD>Integrator object that computes the integral of the
queue size in bytes. The sum_ variable of this object has the running sum
(integral) of the queue size in bytes. 

<P>
</DD>
<DT><STRONG>pktsInt_</STRONG></DT>
<DD>Integrator object that computes the integral of the queue
size in packets. The sum_ variable of this object has the running sum
(integral) of the queue size in packets. 
</DD>
</DL>

<P>
QUEUEMONITOR/ED O<SMALL>BJECTS</SMALL>
<BR>
This derived object is capable of differentiating regular packet drops
from early drops. Some queues distinguish regular drops (e.g. drops due to
buffer exhaustion) from other drops (e.g. random drops in RED queues).
Under some circumstances, it is useful to distinguish these two types of
drops. 

<BR>
State Variables are:
<DL>
<DT><STRONG>epdrops_</STRONG></DT>
<DD>The number of packets that have been dropped ``early''. 

<P>
</DD>
<DT><STRONG>ebdrops_</STRONG></DT>
<DD>The number of bytes comprising packets that have been
dropped ``early''. 
</DD>
</DL>

<P>
Note: because this class is a subclass of QueueMonitor, objects of this
type also have fields such as pdrops_ and bdrops_. These fields describe
the total number of dropped packets and bytes, including both early and
non-early drops. 

<P>
Q<SMALL>UEUE</SMALL>M<SMALL>ONITOR/</SMALL>ED/F<SMALL>LOWMON </SMALL>O<SMALL>BJECTS</SMALL>
<BR>
These objects may be used in the place of a conventional QueueMonitor
object when wishing to collect per-flow counts and statistics in addition
to the aggregate counts and statistics provided by the basic QueueMonitor. 

<P>
<TT>$fmon classifier cl</TT>
<BR>
This inserts (read) the specified classifier into (from) the flow monitor
object. This is used to map incoming packets to which flows they are
associated with. 

<P>
<TT>$fmon dump</TT>
<BR>
Dump the current per-flow counters and statistics to the I/O channel
specified in a previous attach operation. 

<P>
<TT>$fmon flows</TT>
<BR>
Return a character string containing the names of all flow objects known
by this flow monitor. Each of these objects are of type
QueueMonitor/ED/Flow. 

<P>
<TT>$fmon attach chan</TT>
<BR>
Attach a tcl I/O channel to the flow monitor. Flow statistics are written
to the channel when the dump operation is executed. 

<P>
Configuration Parameters are:
<DL>
<DT><STRONG>enable_in_</STRONG></DT>
<DD>Set to true by default, indicates that per-flow
arrival state should be kept by the flow monitor. If set to false, only
the aggregate arrival information is kept. 

<P>
</DD>
<DT><STRONG>enable_out_</STRONG></DT>
<DD>Set to true by default, indicates that per-flow departure state should be
kept by the flow monitor. If set to false, only the aggregate departure
information is kept. 

<P>
</DD>
<DT><STRONG>enable_drop_</STRONG></DT>
<DD>Set to true by default, indicates that per-flow drop state should be kept
by the flow monitor. If set to false, only the aggregate drop information
is kept. 

<P>
</DD>
<DT><STRONG>enable_edrop_</STRONG></DT>
<DD>Set to true by default, indicates that per-flow early drop state should be
kept by the flow monitor. If set to false, only the aggregate early drop
information is kept. 
</DD>
</DL>

<P>
Q<SMALL>UEUE</SMALL>M<SMALL>ONITOR/</SMALL>ED/F<SMALL>LOW </SMALL>O<SMALL>BJECTS</SMALL>
<BR>
These objects contain per-flow counts and statistics managed by a
QueueMonitor/ED/Flowmon object. They are generally created in an OTcl
callback procedure when a flow monitor is given a packet it cannot map on
to a known flow. Note that the flow monitor's classifier is responsible
for mapping packets to flows in some arbitrary way. Thus, depending on the
type of classifier used, not all of the state variables may be relevant
(e.g. one may classify packets based only on flow id, in which case the
source and destination addresses may not be significant). 
State Variables are:
<DL>
<DT><STRONG>src_</STRONG></DT>
<DD>The source address of packets belonging to this flow. 

<P>
</DD>
<DT><STRONG>dst_</STRONG></DT>
<DD>The destination address of packets belonging to this flow. 

<P>
</DD>
<DT><STRONG>flowid_</STRONG></DT>
<DD>The flow id of packets belonging to this flow. 
</DD>
</DL>

<P>
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2003-09-23
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