[systemd-devel] Systemd setting up two Microchip switch ports as individual network interfaces and then bonding them

[Brian Hutchinson]

On Tue, Oct 13, 2020 at 9:16 AM Kevin P. Fleming <kevin at km6g.us> wrote:

> While I can't comment on the specifics of configuring systemd-networkd
> to use ports through DSA (although the linked GitHub issue shows that
> it can be done), I really doubt you are going to be able to
> successfully bond any group of such ports, because they all have the
> same MAC address. In your proposed configuration, you have a NIC
> connected to a switch (internal to your system), which would then have
> multiple ports connected to *another* switch. Unless the switches
> involved support STP or some other loop-avoidance mechanism, you will
> get a switching loop in this configuration.
>
> Connecting multiple ports between two switches requires cooperation in
> the switches (STP, or LACP, or something else).ds,
>
>
So a primer on DSA:

https://docs.phyglos.org/kernel/networking/dsa/configuration.html

You can make the switch ports act as individual network interfaces (called
single port in that web link) that won't create switch loops.

The pre-cursor to DSA that the OpenWRT guys use does the same thing.  It
can bust a switch up into individual ports ... then you can do whatever you
want with them.

Regards,

Brian
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