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How to distinguish between CMM700-AA and CMM700-CC Technical Level
Solution

Background

  • On N+N chassis types (61K N+N, 44K, 64K) there are two types of CMMs: CMM700-AA and CMM700-CC. The difference between the two depends on the hardware, CPU, and memory chip.
  • For CMM700, there are two major SW versions: 3.4x and 3.7x (and above).
  • Version 3.4x supports CMM700-AA only.
  • Version 3.7x and above supports both CMM700-AA and CMM700-CC.

Explanation

  • CMM700-CC was introduced due to the EOL of several hardware components in CMM700-AA. To support this change, version 3.7x was created.
  • Working with the combination of hardware is supported, meaning that a single chassis can include one CMM700-AA and one CMM700-CC.
  • Working with a combination of SWs is supported but not recommended (can be used in a transition phase). Meaning, a single chassis can contain one CMM700 running version 3.4x and one CMM700 running version 3.7x.
  • We always want to have the same version on all CMMs in the setup.
  • In some cases, it is important to distinguish between the two types of CMMs (for instructions on how to do this, see below).

For example:

When an RMA is performed for CMM700, the old unit might be CMM700-AA and the new unit might be CMM700-CC. In this case, one CMM in the chassis can have version 3.4x installed and the second 3.7x. It is important not to downgrade CMM700-CC to version 3.4x but instead to upgrade CMM700-AA to version 3.7x.

Solution 

To check the CMM type, do the following:

Log into the CMM and run the following command:

# getenv prodrev

On CMM700-AA the expected output is:

prodrev=AA

On CMM700-CC the expected output is:

prodrev=CC

To run commands on the CMM, there are two options available:

  • Direct console connection to the relevant CMM.
  • Use SSH to connect to the active CMM. SSH is also available from the active CMM to the standby CMM over the usb0/1 interfaces:
    • From 192.168.1.130 to 192.168.1.131 and vice versa.
    • From 192.168.1.2 to 192.168.1.3 and vice versa.

If the CMM is not operational, the CMM type will be marked on a label on top of the CMM.

The label will indicate ShMM-700R-AA or ShMM-700R-CC:

This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

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