netdev - Re: [PATCHv3 net-next 05/10] docs: bridge: add STP doc

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Message-ID: <20231129071051.195f5767@hermes.local>
Date: Wed, 29 Nov 2023 07:10:51 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Hangbin Liu <liuhangbin@...il.com>
Cc: netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>, David
 Ahern <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Ido Schimmel
 <idosch@...sch.org>, Nikolay Aleksandrov <razor@...ckwall.org>, Roopa
 Prabhu <roopa@...dia.com>, Florian Westphal <fw@...len.de>, Andrew Lunn
 <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean
 <olteanv@...il.com>, Jiri Pirko <jiri@...nulli.us>, Marc Muehlfeld
 <mmuehlfe@...hat.com>
Subject: Re: [PATCHv3 net-next 05/10] docs: bridge: add STP doc

On Wed, 29 Nov 2023 15:43:24 +0800
Hangbin Liu <liuhangbin@...il.com> wrote:

> On Tue, Nov 28, 2023 at 02:48:40PM -0800, Stephen Hemminger wrote:
> > On Tue, 28 Nov 2023 16:49:38 +0800
> > Hangbin Liu <liuhangbin@...il.com> wrote:
> >   
> > > +STP is a Layer 2 protocol that operates at the Data Link Layer of the OSI
> > > +model. It was originally developed as IEEE 802.1D and has since evolved into
> > > +multiple versions, including Rapid Spanning Tree Protocol (RSTP) and
> > > +`Multiple Spanning Tree Protocol (MSTP)
> > > +<https://lore.kernel.org/netdev/20220316150857.2442916-1-tobias@waldekranz.com/>`_.
> > > +  
> 
> The STP was originally developed as IEEE 802.1D. So how about keep this part,
> 
> > 
> > Last time I checked, IEEE folded RSTP into the standard in 2004.
> > https://en.wikipedia.org/wiki/IEEE_802.1D  
> 
> and add a new paragraph like:
> 
> The 802.1D-2004, removed the original Spanning Tree Protocol, instead
> incorporating the Rapid Spanning Tree Protocol (RSTP). By 2014, all the
> functionality defined by IEEE 802.1D has been incorporated into either
> IEEE 802.1Q-2014 (Bridges and Bridged Networks) or IEEE 802.1AC (MAC Service
> Definition). 802.1D is expected to be officially withdrawn in 2022.
> 
> Thanks
> Hangbin

Looks good, I have some old code to modify in kernel STP to do RSTP
but porting is a lot of work (mostly testing).