Subject: [Int-area] Extensions for Multi-MTU Subnets

From: Iljitsch van Beijnum <[email-masked]>
Date: Tue, 28 Oct 2014 00:14:18 +0100

Hi all,

It's been a long time, but I have a -04 of my draft that aims to make it possible to automatically use jumboframes on subnets by having nodes negotiate a maximum packet size to be used between them.

The basic idea has been the same all along, but the implementation details have changed a lot over time. The main thing I focussed on in this version is to allow for the possibility to do all this in a daemon running in user space rather than require kernel changes.

As such, I think this has a much better chance of seeing deployment compared to for instance RFC 4821.

The intended status is experimental.

Iljitsch

> A New Internet-Draft is available from the on-line Internet-Drafts directories.

>        Title           : Extensions for Multi-MTU Subnets
>        Author          : Iljitsch van Beijnum
> 	Filename        : draft-van-beijnum-multi-mtu-04.txt
> 	Pages           : 22
> 	Date            : 2014-10-27

> Abstract:
>   In the early days of the internet, many different link types with
>   many different maximum packet sizes were in use.  For point-to-point
>   or point-to-multipoint links, there are still some other link types
>   (PPP, ATM, Packet over SONET), but multipoint subnets are now almost
>   exclusively implemented as Ethernets.  Even though the relevant
>   standards mandate a 1500 byte maximum packet size for Ethernet, more
>   and more Ethernet equipment is capable of handling packets bigger
>   than 1500 bytes.  However, since this capability isn't standardized,
>   it is seldom used today, despite the potential performance benefits
>   of using larger packets.  This document specifies mechanisms to
>   negotiate per-neighbor maximum packet sizes so that nodes on a
>   multipoint subnet may use the maximum mutually supported packet size
>   between them without being limited by nodes with smaller maximum
>   sizes on the same subnet.

> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-van-beijnum-multi-mtu/

> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-van-beijnum-multi-mtu-04

> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=draft-van-beijnum-multi-mtu-04