[OpenWrt-Devel] [PATCH 4/5] lantiq/xrx200-net: add FID (filtering identifier) setting

[Martin Schiller]

On 02/19/2016 at 2:22 PM, John Crispin wrote:
>
>
> On 19/02/2016 14:08, Martin Schiller wrote:
> > On 02/19/2016 at 11:27 AM, John Crispin wrote:
> >>
> >>
> >> On 19/02/2016 08:29, Martin Schiller wrote:
> >>> On 02/19/2016 at 6:32 AM, John Crispin wrote:
> >>>>
> >>>>
> >>>> On 18/02/2016 14:13, Martin Schiller wrote:
> >>>>> By setting the FID of a VLAN group to a value other then the default
> (0) it
> >>>>> is possible to switch from Shared VLAN Learning to Independant VLAN
> >>>> Learning.
> >>>>>
> >>>>
> >>>> and what are the pro / cons of doing so ?
> >>>
> >>> Independant:
> >>> On incoming VLAN traffic the source MAC address is learned but is not
> >> made
> >>> available for other VLANs (with other FIDs).
> >>>
> >>> Shared:
> >>> The learned MAC address information is shared between multiple
> VLANs
> >>> (with the same FID).
> >>>
> >>> This feature is used for example to separate the LAN and WAN
> interfaces.
> >>
> >> so if i am not misunderstanding this, we want one fid / vlan. can we
> >> just write the pvid into this field unconditionally
> >
> > No, in the given "best practice", the cpu-vlan and the lan-vlan share 1 fid,
> > and the wan-vlan has it independant one.
> >
> > But i don't know if it is really necessary, that the learned MAC address
> > information is shared between cpu-vlan and lan-vlan.
> >
> > The datasheets says, that the shared mode is useful for complex VLAN
> > traffic patterns without forcing the switch to flood the unicast traffic in
> > each direction.
> >
> > When we assume, that it will also be ok that we simply use one unique
> > fid /vlan group, than it would be the best to use the vlan group index as fid,
> > because fid has a range of 0-63 and we have vlan 0-63.
> >
> > The pvid is an port option, which is not unique and can get values from 0 -
> 4095.
> >
>
>
> ok, i assume this comes from the competence center ? can you tell me the
> exact file name and release date so i can go looking for the PDF ?

The "best practice" for Ethernet WAN/LAN separation is from this document:

XWAY_VRX200_Family_PPE_Switch_AN_Rev1.0_20110907.pdf (2.6 MB) / 2013-10-30 06:06:34

Have a look at chapter 3.6.1

And the Filtering Identifier description is from:

Common Ethernet Switch API Users Manual Programmers Guide Rev4.1 (5.26 MB) / 2015-03-11 17:14:51

Chapter 4.1.1.3

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