Re: timefilters

[Andy Bierman <abierman@cisco.com>]

At 12:39 PM 9/7/2004, David B Harrington wrote:
>Hi,
> 
>RFC2021 says that "A row is considered changed if the value 
>of any object in the row changes or if the row is created or deleted."
> 
>How is a deleted row represented in the response to a GetNext 
>or GetBulk? 

Why would a deleted row with a TimeFilter INDEX component
be treated differently than a deleted row without one?
The agent should not be returning deleted rows.

People often confuse TimeFilter with some kind of history
archiving mechanism, and TimeFilter=102 means retrieve
the value of foo at sysUpTime=102.  It just means get
the current value of foo if foo changed since sysUpTime=102.
Big difference.
If foo is deleted, there is no current value, and the 2nd order
test (changed since 102) is irrelevant.

>I didn't see the reporting of deleted rows mentioned in
>RFC2021 except in the initial definition. I would think a 
>deleted row would simply be skipped over in a GetNext or 
>GetBulk operation, and thus not be reported. The 2021 update 
>I-D doesn't shed any more light on this (and has grammar 
>mistakes/typos in the TimeFilter definition and appendix 
>carried over from RFC2021 that still haven't been corrected).

I think I wrote a lot of the TimeFilter text, so maybe I
should take the action item to fix it.  I will send an update 
to this list (and Steve separately since he doesn't read this
list).  Please send me any details of typos and errors and
confusing text that you find.

> 
>I need this info for a mib doctor review of an 802.1AB mib module.
>
>Thanks, 
>David Harrington
>dbharrington@comcast.net
> 


thanks,
Andy