IPMI interface: dedicate, share, failover

Chris Wahl said it short and best:

Dedicate – the IPMI port is used exclusively for out of band access
Share – the on-board NIC’s first port is used exclusively for out of band access
Failover – try to use the IPMI port, and if it is not connected, fail over to the on-board NIC port

From Supermicro:

* The default setting is Failover, which will allow IPMI to be connected from either
the shared LAN port (LAN1/0) or the dedicated IPMI LAN port. Precedence is
given to the Dedicated LAN port over the shared LAN port.
* Select Dedicate for IPMI to connect through the IPMI Dedicated LAN port
at all time.
* Select Share for IPMI to connect through the LAN port on the board

Longer with more detail.

Check the current mode:

ipmitool raw 0x30 0x70 0x0c 0

The output will be one of these:

0x00 = Dedicated
0x01 = Onboard / Shared
0x02 = Failover

To set the mode to

  1. Dedicated
    ipmitool raw 0x30 0x70 0xc 1 1 0
    
  2. Shared
    ipmitool raw 0x30 0x70 0xc 1 1 1
    
  3. Failover
    ipmitool raw 0x30 0x70 0xc 1 0 0 
    

Via http://www.supermicro.com/support/faqs/faq.cfm?faq=9848

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