[systemd-devel] [PATCH 2/2] networkd: integrate LLDP

[Tom Gundersen]

On Mon, Dec 1, 2014 at 11:01 PM, Tomasz Torcz <tomek at pipebreaker.pl> wrote:
> On Sun, Nov 23, 2014 at 02:17:18PM +0100, Tom Gundersen wrote:
>> On Sun, Nov 23, 2014 at 12:01 PM, Tomasz Torcz <tomek at pipebreaker.pl> wrote:
>> > On Sun, Nov 23, 2014 at 10:15:10AM +0530, Susant Sahani wrote:
>> >> This patch integrates LLDP with networkd.
>> >
>> >   In Fedora, we already have LLDP receiver/broadcaster – ladvd.
>> > It has this neat feature of abusing ifAlias by putting endpoint
>> > name there.  This gives port information right at "ip l" output:
>> >
>> > 3: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
>> >     link/ether 10:78:d2:cc:7e:b0 brd ff:ff:ff:ff:ff:ff
>> >     alias connected to Core2-3b-24p (Fa0/7)
>> >
>> >   Would it be possible to implement this in networkd?
>>
>> Definitely possible. However, any suggestions on how to avoid stepping
>> on the toes of other abusers of ifAlias, or is ladvd simply ignoring
>> this?
>
>   I've enabled it in Fedora's ladvd almost three years ago, and
> received no bugreports about breaking any other software.
>
>   ladvd does not take any special precautions. I think it would
> be safe to refrained from changing ifAlias if:
>   - ifAlias is already set, AND
>   - it doesn't start with "connected to "

As discussed in the other thread, we'll expose this info through
networkctl anyway, so it may not be necessary to use ifAlias (or are
there other benefits to this, than just to get it in ip(8) output?

-t