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OmniSwitch AOS Release 6 Switch Management Guide
September 2009
page 5-1
5   Managing CMM
Directory Content
The CMM (Chassis Management Module) software runs the OmniSwitch Series switches. Each 
OmniSwitch chassis can run with two CMMs to provide redundancy also full traffic throughput; one 
CMM is designated as the primary CMM, and the other is designated as the secondary CMM. One CMM 
or the other runs the switch, or both at the same time to provide full traffic throughput.The directory struc-
ture of the CMM software is designed to prevent corrupting or losing switch files. It also allows you to 
retrieve a previous version of the switch software.
In addition to working as standalone switches, the OmniSwitch Stackable Series switches can be linked 
together as a stack. An OmniSwitch Stackable Series stack can provide CMM redundancy; one switch is 
designated as the primary CMM, and one is designated as the secondary CMM. One CMM or the other 
runs the switch, but never at the same time. All other switches in a stack are designated “idle” for the 
purposes of CMM control. 
Note. Mixing different OmniSwitch Stackable Series switches together in the same stack is not supported. 
Management of the stack is run by the stack configuration software. A detailed description of the stack 
configuration software and how it works is provided in the “Managing Stacks” chapter found in the appro-
priate Hardware Users Guide. 
In This Chapter
This chapter describes the basic functions of CMM software directory management and how to implement 
them by using the Command Line Interface (CLI). CLI commands are used in the configuration exam-
ples; for more details about the syntax of commands, see the OmniSwitch CLI Reference Guide.
This chapter contains the following information:
• The interaction between the running configuration, the working directory, and the certified directory is 
described in 
.
• A description of how to restore older versions of files and prevent switch downtime is described in 
.
• The CLI commands available for use and the correct way to implement them are listed in 
.
• The CLI commands and issues involved in managing the directory structure of a stack with redundant 
CMM software is described in