We have an architecture like this :
2 supervision computers connected to an automaton that is connected to multiple PLC.
When the computer is directly connected with the automaton, there are no issues but when I'm using a cisco C9300 switch, supervision computer don't work anymore with the automaton even if they still can ping it.
Computers and automaton are in the same vlan.
I have noticed that the switch is returning an error : Unknown Protocol Drops
Port used on the switch :
- GI1/0/2 => PC 1
- GI1/0/3 => Automaton
- GI1/0/4 => PC2
What I have tried so far :
- Everything in trunk mode
- Everything in access mode
- Add voice vlan
- Add Voice vlan dot1P
- Add lldp transmit / recieve
UAC and firewall are turned off on both computers.
So, when the automaton is using our network via a switch instead of being directly connected to the computer, it doesn't work.
What am I missing ?
UPDATE 15/05/2020 :
So, the automaton technician failed the configuration.
The computer never communicated with the automaton because he used his own computer for the configuration / test ..
Now that he has corrected it, the computer can communicate with the automaton when it's directly connected and it's also working with a switch when computer and automaton are in the same vlan !
Unfortunately, I have to use 2 differents vlan. Automaton has to be in vlan 100 and computer in vlan 101.
When the automaton use the vlan 100 and the computer use the vlan 101, I can ping but the communication between the computer application and the automaton does not work anymore.
I now suspect that the automaton technician is, again, missing something.
Or, I hope not, the profinet protocol can't be routed ?
UPDATE 25/05/2020 :
So. The automaton technician failed again to configure the automaton properly.
Without a switch, it was working, then with a switch, it was working too .. No reason it could not work with a router for me.
The technician fully reloaded the application and it refreshed the new IP (different vlan / gateway).
Now, everything is working fine !