Multiple BMCs in a system: IPMB? Redfish? MCTP?

[Nancy Yuen]

I've talked with some people a while back (long while back) about multiple
BMCs in a system.  Either for redundancy or managing separate parts of a
system.   I'm wondering what other people are thinking in this area if at
all.

We are considering similar designs and I'm looking into options for BMC-BMC
communications.  Some BMCs may not be externally accessible. Here are some
options that we've looked at:

   1. i2c/IPMB
   2. usbnet/Redfish
   3. i2c/MCTP/PLDM or something else?
   4. internal network via switch chip/Redfish or MCTP

 I'd like to reduce our use of IPMI so I want to avoid (1).

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Nancy
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