CMM cannot ping the 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 CMM is
powered on and hung, reset the CMM.
Make sure that the IMM, the management node, and the CMMs
are all on the same subnet.


Verify that the cables between the CMMs
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 CMMs. 
Make sure that the IMM in the compute node has acquired an IP
address from the CMM by
using the Setup utility on the node.
Note: If the CMM recently
lost connection to the DCHP server, you must reset the IMM by using
the CMM interface
so that a new IP address can be acquired.

In the 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 Lenovo 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 Lenovo 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 chassis midplane for bent pins.
If the pins are bent, contact Support.
(Trained service technician only) Complete the following steps: 
Force the link/duplex speed. 
Check the connectors on the nodes and on the chassis midplane
to make sure that no pins are bent.
Replace the I/O expansion card in the management node.
Replace the management node.