netdev - Re: [PATCH v2 net-next 00/10] net: bridge: Multiple Spanning Trees

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Date:   Tue, 01 Mar 2022 22:20:30 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Petr Machata <petrm@...dia.com>,
        Cooper Lees <me@...perlees.com>,
        Ido Schimmel <idosch@...dia.com>,
        Matt Johnston <matt@...econstruct.com.au>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org, navolnenoze@...erda.eu
Subject: Re: [PATCH v2 net-next 00/10] net: bridge: Multiple Spanning Trees

On Tue, Mar 01, 2022 at 18:21, Vladimir Oltean <olteanv@...il.com> wrote:
> Hi Tobias,
>
> On Tue, Mar 01, 2022 at 11:03:11AM +0100, Tobias Waldekranz wrote:
>> A proposal for the corresponding iproute2 interface is available here:
>> 
>> https://github.com/wkz/iproute2/tree/mst
>
> Please pardon my ignorance. Is there a user-mode STP protocol application
> that supports MSTP, and that you've tested these patches with?
> I'd like to give it a try.

I see that Stephen has already pointed you to mstpd in a sibling
message.

It is important to note though, that AFAIK mstpd does not actually
support MSTP on a vanilla Linux system. The protocol implementation is
in place, and they have a plugin architecture that makes it easy for people
to hook it up to various userspace SDKs and whatnot, but you can't use
it with a regular bridge.

A colleague of mine has been successfully running a modified version of
mstpd which was tailored for v1 of this series (RFC). But I do not
believe he has had the time to rework it for v2. That should mostly be a
matter of removing code though, as v2 allows you to manage the MSTIs
directly, rather than having to translate it to an associated VLAN.