Re: [PATCH net-next v4 1/4] net: bonding: add broadcast_neighbor option for 802.3ad

[Nikolay Aleksandrov <razor@blackwall.org>]

On 5/14/25 12:25, Tonghao Zhang wrote:
> Stacking technology is a type of technology used to expand ports on
> Ethernet switches. It is widely used as a common access method in
> large-scale Internet data center architectures. Years of practice
> have proved that stacking technology has advantages and disadvantages
> in high-reliability network architecture scenarios. For instance,
> in stacking networking arch, conventional switch system upgrades
> require multiple stacked devices to restart at the same time.
> Therefore, it is inevitable that the business will be interrupted
> for a while. It is for this reason that "no-stacking" in data centers
> has become a trend. Additionally, when the stacking link connecting
> the switches fails or is abnormal, the stack will split. Although it is
> not common, it still happens in actual operation. The problem is that
> after the split, it is equivalent to two switches with the same configuration
> appearing in the network, causing network configuration conflicts and
> ultimately interrupting the services carried by the stacking system.
> 
> To improve network stability, "non-stacking" solutions have been increasingly
> adopted, particularly by public cloud providers and tech companies
> like Alibaba, Tencent, and Didi. "non-stacking" is a method of mimicing switch
> stacking that convinces a LACP peer, bonding in this case, connected to a set of
> "non-stacked" switches that all of its ports are connected to a single
> switch (i.e., LACP aggregator), as if those switches were stacked. This
> enables the LACP peer's ports to aggregate together, and requires (a)
> special switch configuration, described in the linked article, and (b)
> modifications to the bonding 802.3ad (LACP) mode to send all ARP / ND
> packets across all ports of the active aggregator.
> 
>   -----------     -----------
>  |  switch1  |   |  switch2  |
>   -----------     -----------
>          ^           ^
>          |           |
>        -----------------
>       |   bond4 lacp    |
>        -----------------
>          |           |
>          | NIC1      | NIC2
>        -----------------
>       |     server      |
>        -----------------
> 
> - https://www.ruijie.com/fr-fr/support/tech-gallery/de-stack-data-center-network-architecture/
> 
> Cc: Jay Vosburgh <jv@jvosburgh.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: Simon Horman <horms@kernel.org>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Andrew Lunn <andrew+netdev@lunn.ch>
> Signed-off-by: Tonghao Zhang <tonghao@bamaicloud.com>
> Signed-off-by: Zengbing Tu <tuzengbing@didiglobal.com>
> ---
>  Documentation/networking/bonding.rst |  6 ++++
>  drivers/net/bonding/bond_main.c      | 42 ++++++++++++++++++++++++++++
>  drivers/net/bonding/bond_options.c   | 35 +++++++++++++++++++++++
>  include/net/bond_options.h           |  1 +
>  include/net/bonding.h                |  3 ++
>  5 files changed, 87 insertions(+)
> 

Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>