CPU317 : Two Ethernet Ports but only one MAC Address

JordiHelixFlay

CPU317-2 PN/PD has two Ethernet Ports ( Interface X2 ( PN )). Ports P1 and P2.

But there is only one MAC Adress, and so there is only one IP Address.

1. Could someone give me a SIEMENS document explaining the operation of this 'Dual Port Switch'.

2. There are CPUs with two ports and two MAC Address and so, two IP Addresses ?

Thanks

Thanks Navnag for such prompt answer.

What I would like to find is a SIEMENS document explaining the operation on that dual-switch.

Also , I would like to know if there is a list of CPUs in SIEMENS with this dual-switch configured to have this behaviour ( only one MAC and only one IP Address ) and a list of CPUS with another behaviour ( more than one MAC , so more than one IP Address ).

The background problem here is that when we connect a HIRSCHMANN switch here. The HIRSCHMANN switch is detecting more than one IP Address on the CPU.

My problem is that some HIRSCMANN switches detect:

- When Switch is connected to PORT 1 : MAC-Address + 1

- When Switch is connected to PORT 1 : MAC-Address + 2

Even if the Ethernet switch of the CPU317 2PN/DP only has one MAC-Address ( The one printed in the CPU ).

And this is annoying.

The way to solve that is following the link that Ste39 introduced.

And exactly in this link you find another user with my same problem and the solution:

315-2PN/DP two MAC Addresses?

In summary :

In the hardware Configuration of the port you must enable : ‘End of Topology discovery’.

Thanks a lot to everyone and above all to Ste39 to solve my problem.