Toronto IETF, July 1994

Presentation presented by Timon Sloane and Karl Auerbach on possible
changes to the filter mechanism for RMON.



Today we have the following relationship:


	filter \		 --> bufferControl --> captureBuffer
		\		/
	filter ----> channel---/
		 	|
			|
			|
			v
		    event generation









Propose that a new filtering type be added (filter'), and that
a new backend processing be added (storage point capture).




	filter \		 --> bufferControl --> captureBuffer
		\		/
	filter ----> channel---/
		/	|	\
	filter'/ 	|	 --> sPointControl ---> sPointCapture
		 	|
		 	v
		    event generation



filter' is designed to provide faster and more flexible filtering.

storage point capture is designed to save arbitrary values that
were saved during the processing of filter'.









The new filter types (filter') will use the stack processing
model proposed by Karl.  The mechanism will be augmented with
commands to save values as "storage points".  This are like
registers, but they are variable length.

filter'ControlEntry ::= SEQUENCE {
	filter'Index		INTEGER,
	filter'ChannelIndex	INTEGER,
	filter'Instructions	OCTET STRING (SIZE (1..255))
	filter'Owner		OwnerString,
	filter'Status		rowStatus
}









--
-- sPoint -> Storage Point
--
sPointControlEntry ::= SEQUENCE {
	sPointControlIndex		INTEGER,
	sPointControlChannelIndex	INTEGER,	-- ptr to channel
	sPointControlFullAction		INTEGER,
	sPointControlFullStatus		INTEGER,
	sPointControlRequestedRows	INTEGER,
	sPointControlGrantedRows	INTEGER,
	sPointControlRowsGenerated	INTEGER,
	sPointControlOwner		OwnerString,
	sPointControlStatus		rowStatus
}

--
-- sPoint[1-15] are generated by the filter' processing, and are
-- dumped into a row of the following table.
--
-- Note Well:	Very often the manager will find that the 
-- 		following table is sparse.
--
sPointCaptureEntry ::= SEQUENCE {
	sPointCaptureIndex
	sPointCaptureControlIndex	INTEGER,	-- ptr to sPointControl
	sPoint1				OCTET STRING (SIZE (0..16)),
	sPoint2				OCTET STRING (SIZE (0..16)),
	sPoint3				OCTET STRING (SIZE (0..16)),
	sPoint4				OCTET STRING (SIZE (0..16)),
	sPoint5				OCTET STRING (SIZE (0..16)),
	sPoint6				OCTET STRING (SIZE (0..16)),
	sPoint7				OCTET STRING (SIZE (0..16)),
	sPoint8				OCTET STRING (SIZE (0..16)),
	sPoint9				OCTET STRING (SIZE (0..16)),
	sPoint10			OCTET STRING (SIZE (0..16)),
	sPoint11			OCTET STRING (SIZE (0..16)),
	sPoint12			OCTET STRING (SIZE (0..16)),
	sPoint13			OCTET STRING (SIZE (0..16)),
	sPoint14			OCTET STRING (SIZE (0..16)),
	sPoint15			OCTET STRING (SIZE (0..16)),
	sPoint16			OCTET STRING (SIZE (0..16))
}