@Carissa 

realisitically you should have these ports set in auto duplex, not hard set full 1g, i had to change duplex to auto before it would negotiate with other switches, (we don't generally hardset duplex speed)

@Carissa What other switches? I have the same problem with TPlink 2600G and Unifi EdgeSwitch I can't even share VLANs. It's been weeks trying to connect them. 

Hi all

I want connect my T1700G-28TQ V2 to a mikrotic crs309sfp+ switch wie sfp+ cabel and read you have to change the duplex mode to auto But when i set the duplex mode to auto as example fpr the port 28 sfp+ port there is a message "auto is ilegal for fibermode" ?

Could you help me in this case ?

thank you

Michael  

@Carissa 

cool

I know this is bit old post, but my experience connecting Mikrotik CCR1016 SFP ports to TP link switches or Cisco switches is that both ends needs to be set up to 1000 full-duplex (manual option under SDN controller). Then link works including all VLAN tags.

There is issue on the Mikrotik design though. Any SFP port is required to be set to 1000 full duplex and auto negotiation off, but doing so, stops any link monitoring option on Mikrotik side. It is required if you were setting up a portchannel / LACP bond etc, with MII or ARP and with SFPs (copper or fiber transceivers), Mikrotik does npot failover / failback the traffic on unplugging / pluggng the cables.