netdev - Re: [PATCH net-next 0/2] net: bridge: add support for backup port

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Date:   Fri, 20 Jul 2018 08:22:22 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        anuradhak@...ulusnetworks.com, bridge@...ts.linux-foundation.org,
        wkok@...ulusnetworks.com, davem@...emloft.net
Subject: Re: [PATCH net-next 0/2] net: bridge: add support for backup port

On Fri, 20 Jul 2018 17:48:24 +0300
Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote:

> Hi,
> This set introduces a new bridge port option that allows any port to have
> any other port (in the same bridge of course) as its backup and traffic
> will be forwarded to the backup port when the primary goes down. This is
> mainly used in MLAG and EVPN setups where we have peerlink path which is
> a backup of many (or even all) ports and is a participating bridge port
> itself. There's more detailed information in patch 02. Patch 01 just
> prepares the port sysfs code for options that take raw value. The main
> issues that this set solves are scalability and fallback latency.
> 
> We have used similar code for over 6 months now to bring the fallback
> latency of the backup peerlink down and avoid fdb notification storms.
> Also due to the nature of master devices such setup is currently not
> possible, and last but not least having tens of thousands of fdbs require
> thousands of calls to switch.
> 
> I've also CCed our MLAG experts that have been using similar option.
> 
> Thanks,
>  Nik
> 
> 
> Nikolay Aleksandrov (2):
>   net: bridge: add support for raw sysfs port options
>   net: bridge: add support for backup port
> 
>  include/uapi/linux/if_link.h |  1 +
>  net/bridge/br_forward.c      | 16 ++++++++-
>  net/bridge/br_if.c           | 53 ++++++++++++++++++++++++++++
>  net/bridge/br_netlink.c      | 30 +++++++++++++++-
>  net/bridge/br_private.h      |  3 ++
>  net/bridge/br_sysfs_if.c     | 82 ++++++++++++++++++++++++++++++++++++--------
>  6 files changed, 168 insertions(+), 17 deletions(-)
> 

Not sure why this has to be built into the bridge.
There already is bonding and teaming, why invent yet another?