Chassis Management Module (CMM) cannot ping the Chassis Management Module (CMM) in a different chassis

         
Complete the following steps until the problem
is solved:

               
Make sure that the chassis management modules
are powered on and the applicable ports are enabled. 

                     
If the Chassis Management Module (CMM) is
powered on and hung, reset the Chassis Management Module (CMM).
                     
Make sure that the IMM, the management node, and the Chassis Management Module (CMM)s
are all on the same subnet.
                  
               
               
Verify that the cables between the Chassis Management Module (CMM)s
and the top-of-rack switch are correctly connected and that the activity
LEDs are lit on the applicable ports.
               
Make sure that the management node has a correct IP address and
is on the same subnet as the Chassis Management Module (CMM)s. 
               
Make sure that the compute node IMM has acquired an IP address
from the Chassis Management Module (CMM) by
using the Setup utility on the node.

                     Note: If the Chassis Management Module (CMM) recently
lost connection to the DCHP server, you must to reset the IMM by using
the Chassis Management Module (CMM) interface
so that a new IP address can be acquired.
               
               
In the Chassis Management Module (CMM) user
interface, click Chassis Management > Component IP Configuration and
make sure that the IP address that is listed is the same as the IP
address that is displayed in the Setup utility. If it is not the same
IP address, configure the IMM network settings correctly or reset
the IMM to automatically acquire a new IP address. 
               
Check the IBM Support Portal for any firmware
updates that might apply to this problem. You can view the release
notes for a firmware update to determine the issues that the update
addresses. 
               
Check the IBM Support Portal for any service
bulletins that are related to network connectivity.
               
Remove the compute node from the chassis and check the connectors
on the back of the node and on the midplane for bent pins. If the
pins are bent, contact IBM® Support.
               
(Trained service technician only) Complete the following steps: 

                     
Force the link/duplex speed. 
                     
Check the connectors on the nodes and on the midplane to make
sure that no pins are bent.
                     
Replace the I/O expansion card in the management node.
                     
Replace the management node.