[j-nsp] cheapest juniper router capable of lsys

[Chris Burton]

I will take a look.  I have tested on a number of different versions, 
but nothing as new as 4.11, only been tracking the shipped kernel with 
Ubuntu 14.04 and 16.04, in the 3.1 and 4.4 versions respectively, but 
pulling from upstream and compiling from source instead of Ubuntu src 
packages.

-C


On 06/28/2017 12:09 AM, Vincent Bernat wrote:
>   ❦ 27 juin 2017 23:26 -0700, Chris Burton <chris.burton at speakeasy.net> :
>
>> Interesting, in the kernel versions I tested I was not able to get it
>> to work by just passing in the runtime changes to
>> /sys/class/net/<bridge>/bridge/group_fwd_mask, I actually had to make
>> changes to virtual bridge header file and recompile the kernel as
>> there are/were safeguards in place to prevent someone from just making
>> the runtime changes, which makes sense because this is a potentially
>> dangerous change.  Recompiling is not a big deal, but would be
>> interested to know which kernel versions you were able to get that to
>> work with just runtime changes as that would save some time.
> The different cases are handled here:
>   http://elixir.free-electrons.com/linux/v4.11.5/source/net/bridge/br_input.c#L275
>
> fwd_mask_required is not tunable by the user. Unless you are using
> VLAN-aware bridges _and_ QinQ, its value is 0. group_fwd_mask is the
> live value you put in sysfs, so it should work. There is a safeguard
> mechanism to deny acceptance of 01-80-C2-00-00-[00,0B,0C,0D,0F] when
> setting the group_fwd_mask value.
>
> I didn't test recently, but I have used this mechanism in the past for
> LLDP. Which kernel are you using?