User's Manual

Installing and Setting Up the CMC 47
NOTE: For information about installing a standby CMC, see the Hardware Owner’s
Manual. For instructions on installing the CMC firmware on your standby CMC,
follow the instructions in "Installing or Updating the CMC Firmware" on page 43.
Primary CMC Election Process
There is no difference between the two CMC slots; that is, slot does not
dictate precedence. Instead, the CMC that is installed or booted first
assumes the role of the active CMC. If AC power is applied with two CMCs
installed, the CMC installed in CMC chassis slot 1 (the left) normally
assumes the active role. The active CMC is indicated by the blue LED.
If two CMCs are inserted into a chassis that is already powered on, automatic
active/standby negotiation can take up to two minutes. Normal chassis
operation resumes when the negotiation is complete.
Obtaining Health Status of Redundant CMC
You can view the health status of the standby CMC in the Web interface. For
more information about accessing CMC health status in the Web interface,
see "Viewing Chassis Graphics and Component Health Status" on page 90.