netdev - Re: [RFC PATCH bridge 0/5] Add basic VLAN support to bridges

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Message-ID: <20120823124141.402b7b34@nehalam.linuxnetplumber.net>
Date:	Thu, 23 Aug 2012 12:41:41 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH bridge 0/5] Add basic VLAN support to bridges

On Thu, 23 Aug 2012 15:29:50 -0400
Vlad Yasevich <vyasevic@...hat.com> wrote:

> This series of patches provides an ability to add VLAN IDs to the bridge
> ports.  This is similar to what can be found in most switches.  The bridge
> port may have any number of VLANs added to it including vlan 0 for untagged
> traffic.  When vlans are added to the port, only traffic tagged with particular
> vlan will forwarded over this port.  Additionally, vlan ids are added to FDB
> entries and become part of the lookup.  This way we correctly identify the FDB
> entry.
> 
> There are still pieces missing.  I don't yet support adding a static fdb entry
> with a particular vlan.  There is no netlink support for carrying a vlan id.
> 
> I'd like to hear thoughts of whether this is usufull and something we should
> persue.
> 
> The default behavior ofthe bridge is unchanged if no vlans have been
> configured.

Initial reaction is that this is a useful. You can already do the same thing
with ebtables, and ebtables allows more flexibility. But ebtables does slow
things down, and is harder to configure.
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