sg-3100 strange interface status

[mcury]

Hello forum, found a strange status in my port 3 interface.
I don't have LAGG or anything like it.

As we can see below, port3 is showing a "master" status.
Port3 is connected to a Synology NAS.

Is this a bug? This is new, it never happened before.

[mcury]

Rebooted the NAS and the master state jumped to port1 , which is a Desktop PC

[jimp]

That isn't for LAGG/HA/etc, it's the Ethernet link "master" mode.

https://en.wikipedia.org/wiki/Autonegotiation#Message_and_unformatted_next_page

[mcury]

From what I could understand, it's related to auto negotiation.. where the master could force the slave to negotiate from 1000baseT to 100baseTX for an example
I didn't know about this master/slave thing in the auto negotiation process.

Thanks Jimp for your time answering me