[Bridge] [PATCH] [bridge] Add split horizon

richardvoigt at gmail.com richardvoigt at gmail.com
Sat Jun 13 19:18:27 PDT 2009


>
>
> I would really like to know in what situation you would use
> the current behavior to forward back VLAN pkgs over the same interface
> it was received on?


With a gigabit VLAN capable switch, 20 ports in untagged mode on distinct
VLANs, 1 trunking port attached to a gigbit card in my Linux firewall, 1
trunking port to a second gigabit VLAN capable switch configured similarly
in another physical location, it allows me to filter traffic between all 40
attached networks as if my Linux box had 40 network interfaces.  It's a very
useful combination of VLANs and bridging.


>
> Also, I am trying to find where it states that a VLAN is considered its own
> physical port. Any pointers?
>

A linux bridge is like a switching hub, with a separate port for every
interface you add with brctl addif.  All local interfaces get treated the
same -- they each get their own port on the bridge -- whether a physical or
virtual or sub-interface.
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