Transport protocols and bulk file transfer

[Steven Senger <>]

Randall Stewart is the first listed person on the SCTP partial reliability RFC. I asked him if there were versions of partial reliability other than the timed reliability mentioned in the RFC under consideration. Here is the response I got. 

- steve

Begin forwarded message:

> From: Randall Stewart <>
> Date: February 14, 2005 1:56:32 PM CST
> To: Steven Senger <>
> Subject: Re: Question on Partial Reliability
>
> Steven Senger wrote:
> > Randall,
> > In RFC 3758 you describe an extension to SCTP that will allow partial reliability. You mention timed reliability as a specific example and then mention that IETF should develop a limited number of standard definitions of partially reliable services. Are there versions of partial reliability other than timed reliability currently under consideration. If so could you give me pointers to them.
> > Thanks in advance.
> > Steven Senger
> > Dept. of Computer Science
> > Dept. of Mathematics
> > Univ. of Wisc. - La Crosse
> Steven:
>
> Nice to hear from you... So far there are NO drafts on other
> profiles for partial reliability.. However Cisco is using one :-D
>
> We have a product called netflow.. it takes traffice measurments
> and such.. We use a "buffer bounded" profile so that we can
> drop data when our buffers are overflowing..
>
> We basically allocate a fixed amount to a buffer.. much like
> you would a socket buffer.. and when we hit that full.. instead
> of returning ENOSPACE (not that IOS would ever do that ;->) we
> look for some chunks that are marked available to be removed that
> have been sent and purge those until there is room for the new
> chunk.
>
> Of course there is the possiblity that you COULD have everything
> unsent and skipped.. In  such a case we allow the caller to specify
> discard the oldest i.e. probably the next to send or discard the
> newest.. i.e. the one this send is on..
>
> Anyway.. I don't know if we plan to write a draft on it.. we probably
> should..
>
> R
>
> -- 
> Randall Stewart
> ITD
> 803-345-0369 <or> 815-342-5222