CMM cannot ping the CMM in a different chassis

Action​

Complete the following steps until the problem is solved:

1. Make sure that the Chassis Management Modules are powered on and the applicable ports are enabled.
   1. If the CMM is powered on and hung, reset the CMM.
   2. Make sure that the IMM, the management node, and the CMMs are all on the same subnet.
2. 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 applicable ports are enabled in the I/O module.
3. If you are using a DHCP server for the management network, make sure that the CMM is configured correctly.
4. Connect the CMM to a different port on the top-of-rack switch. Make sure that the activity LEDs are lit on the port and that the port is enabled.
5. Check Lenovo Support 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.
6. Check Lenovo Support for any service bulletins that are related to network connectivity.
7. (Trained service technician only) Complete the following steps:
   1. Force the link/duplex speed.
   2. Check the connectors on the CMM and on the chassis midplane to make sure that no pins are bent.
   3. Replace the CMM that cannot connect to the network.