From what I know, on S1200BTL you can use only NIC1 or RMM4 to communicate with the BMC. NIC2 is not physically wired to BMC.
That would be quite unfortunate, because I can't use NIC2 with my OS (VMware ESXi), so it would be ideal for BMC traffic separation. Maybe the manual should be updated, because it clearly states that NIC2 can be used for BMC.
I see... Which manual states NIC2 can be used for BMC? Let me double check that.
Integrated BMC Embedded LAN Channel
The Integrated BMC hardware includes two dedicated 1000M network interfaces.
Interface 1: This interface is available from either of the available NIC ports in system that can
be shared with the host. Only one NIC may be enabled for management traffic at any time. To
change the NIC enabled for management traffic, please use the ―Write LAN Channel Port‖
OEM IPMI command. The default active interface is port 1 (NIC1).
Interface 2: This interface is available from the optional RMM4 which is a dedicated
management NIC that is not shared with the host."