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

John Crispin blogic at openwrt.org
Fri Feb 19 08:22:14 EST 2016

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 ?
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