Cisco Cisco Content Delivery Engine 250 安装指南

 
 
 
 

 

Current CDE250 systems utilize an Intelligent Platform Management Interface (IPMI) 
infrastructure that monitors and manages the health of the system. This is implemented using 
embedded IPMI firmware running within the Baseboard Management Controller (BMC) system 
chip on the motherboard.  The current version of IPMI firmware used on the CDE250 is v3.03. 
 

There is currently one (1) known issue associated with the IPMI / BMC subsystem and the IPMI 
FW version 3.03. 

 

Technical analysis: 



  There is a timing delay in the CDE250 IPMI FW v3.03 provided by Supermicro that can 

allow a race condition that can allow the BMC/Harmonics chipset to have bus contention 
that will cause the BMC to hang.  When this hang occurs the Superdoctor "sdt" utility 
will not return, this causes invalid system sensor values to be reported to the CSDM.  
This causes our customers undo alarm as the system appear to having issues. 



  The only way to reset the BMC after it has reached this state is to remove the power 

cables from the system, wait at least 10 seconds and then replace the power cables. 



  The Technical team found that there was a change made to IPMI FW v3.06 to remove a 

timing delay and remove the timing window in which this bus contention could occur.   

 
Root Case: IPMI FW versions older than v3.06 have a timing delay that can cause a BMC bus 
contention that can cause the BMC chip set to hang.  
 
Solution: Update the IPMI firmware to v3.06.  Firmware v3.06 contains the fix to correct this 
timing delay caused hang.  We have validated this new firmware internally at Cisco.  IPMI v3.06 
firmware will be shipped on all new CDE250 systems.  Please follow the procedure described in 
Section 2 to upgrade the IPMI firmware to v3.06.